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| 1 | Influence of N on precipitation behavior,associated corrosion and mechanical properties of super austenitic stainless steel S32654显示文摘The influence of N on the precipitation behavior,associated corrosion,and mechanical properties of S32654 were investigated by microstructural,electrochemical,and mechanical analyses.Increasing the N content results in several alterations:(1) grain refinement,which promotes intergranular precipitation;(2) a linear increase in the driving force for Cr2 N and Mo activity,which accelerates the precipitation of intergranular Cr2 N and π phase,respectively;(3) a linear decrease in the driving force for σ phase and Cr activity,which suppresses the formation of intragranular σ phase.The total amount of precipitates first decreased and then increased with the N content increasing.Furthermore,the intergranular corrosion susceptibility depended substantially on the total amount of precipitates and also first exhibited a decreasing and then an increasing trend as the N content increased.In addition,aging precipitation caused a considerable decrement in the ultimate tensile strength(UTS) and a remarkable increment in the yield strength(YS).Both the UTS and YS always increased with N content increasing throughout the solution and aging process.Whereas the elongation was considerably sensitive to the aging treatment,it exhibited marginal variation with the N content increasing. | Shucai Zhang Huabing Li Zhouhua Jiang Zhixing Li Jingxi Wu Binbin Zhang Fei Duan Hao Feng Hongchun Zhu | 2020 | Journal of Materials Science & Technology2020，42，7： | 10 |
| 2 | Microbiologically influenced corrosion behavior of S32654 super austenitic stainless steel in the presence of marine Pseudomonas aeruginosa biofilm显示文摘S32654 super austenitic stainless steel(SASS) is widely used in highly corrosive environments. However,its microbiologically influenced corrosion(MIC) behavior has not been reported yet. In this study, the corrosion behavior of S32654 SASS caused by a corrosive marine bacterium Pseudomonas aeruginosa was investigated using electrochemical measurements and surface analysis techniques. It was found that P. aeruginosa biofilm accelerated the corrosion rate of S325654 SASS, which was demonstrated by a negative shift of the open circuit potential(EOCP), a decrease of polarization resistance and an increase of corrosion current density in the culture medium. The largest pit depth of the coupons exposed in the P.aeruginosa broth for 14 days was 2.83 m, much deeper than that of the control(1.33 m) in the abiotic culture medium. It was likely that the P. aeruginosa biofilm catalyzed the formation of CrO_3, which was detrimental to the passive film, resulting in MIC pitting corrosion. | Huabing Li Chuntian Yang Enze Zhou Chunguang Yang Hao Feng Zhouhua Jiang Dake Xu Tingyue Gu Ke Yang | 2017 | Journal of Materials Science & Technology2017，33，12： | 10 |
| 3 | Effect of tempering temperature on the microstructure and properties of ultrahigh-strength stainless steel显示文摘The microstructure, precipitation and mechanical properties of Ferrium S53 steel, a secondary hardening ultrahigh-strength stainless steel with 10% Cr developed by QuesTek Innovations LLC, upon tem pering were studied by scanning electron microscopy (SEM), transm ission electron microscopy (TEM), X-ray diffraction (XRD), and tensile and impact tests. Based on these results, the influence of the tem pering temperature on the microstructure and properties was discussed. The results show th at decom position occurred when the retained austenite was tem pered above 440 ℃ and that the hardening peak at 482 ℃ was caused by the joint strengthening of the precipitates and martensite transformation. Due to the high Cr content, the trigonal M7C3 carbide precipitated w hen the steel was tem pered at 400 ℃, and M7C3 and M2C (5 -10 nm in size) coexisted w hen it was tem pered at 482 ℃. When the steel was tem pered at 630 ℃, M2C and M23C6 carbides precipitated, and the sizes w ere greater than 50 nm and 500 nm, respectively, but no M7C3 carbide formed. When the tempering tem perature was above 540 ℃, austenitization and large-size precipitates w ere the main factors affecting the strength and toughness. | Yangpeng Zhang Dongping Zhan Xiwei Qi Zhouhua Jiang | 2019 | Journal of Materials Science & Technology2019，35，7： | 9 |
| 4 | Effect of nitrogen on corrosion behaviour of a novel high nitrogen medium-entropy alloy CrCoNiN manufactured by pressurized metallurgy显示文摘A novel high nitrogen medium-entropy alloy CrCoNiN, which had higher strength and slightly lower ductility than CrCoNi alloy, was successfully manufactured by pressurized metallurgy. The microstructure and corrosion behaviour were investigated by microscopic, electrochemical and spectroscopic methods.The results indicated that nitrogen existed in the form of Cr_2N precipitates and uniformly distributed N atoms, and nitrogen alloying significantly refined the grain size. Besides, nitrogen enriched on the outmost surface of passive film and metal/film interface as ammonia(NH-_3 and NH_4^+) and CrN, respectively. The significant improvement of corrosion resistance of CrCoNiN was attributed to the lower metastable pitting susceptibility together with thicker, less defective and more compact passive film. | Hao Feng Huabing Li Xiaolei Wu Zhouhua Jiang Si Zhao Tao Zhang Dake Xu Shucai Zhang Hongchun Zhu Binbin Zhang Muxin Yang | 2018 | Journal of Materials Science & Technology2018，34，10： | 8 |
| 5 | Influence of rare earth Ce on hot deformation behavior of as-cast Mn18Cr18N high nitrogen austenitic stainless steel显示文摘The hot deformation behavior of Mn18Cr18N and Mn18Cr18N+Ce high nitrogen austenitic stainless steels at 1173-1473 K and 0.01-1 s^(-1) were investigated by thermal compression tests.The influence mechanism of Ce on the hot deformation behavior was analyzed by Ce-containing inclusions and segregation of Ce.The results show that after the addition of Ce,large,angular,hard,and brittle inclusions(TiN-Al_(2)O_(3),TiN,and Al_(2)O_(3)) can be modified to fine and dispersed Ce-containing inclusions(Ce-Al-O-S and TiN-Ce-Al-O-S).During the solidification,Ce-containing inclusions can be used as heterogeneous nucleation particles to refine as-cast grains.During the hot deformation,Ce-containing inclusions can pin dislocation movement and grain boundary migration,induce dynamic recrystallization(DRX)nucleation,and avoid the formation and propagation of micro cracks and gaps.In addition,during the solidification,Ce atoms enrich at the front of solid-li-quid interface,resulting in composition supercooling and refining the secondary dendrites.Similarly,during the hot deformation,Ce atoms tend to segregate at the boundaries of DRX grains,inhibiting the growth of grains.Under the synergistic effect of Ce-containing inclusions and Ce segregation,although the hot deformation resistance and hot deformation activation energy are improved,DRX is more likely to occur and the size of DRX grains is significantly refined,and the problem of hot deformation cracking can be alleviated.Finally,the microhardness of the samples was measured.The results show that compared with as-cast samples,the microhardness of hot-deformed samples increases signific-antly,and with the increase of DRX degree,the microhardness decreases continuously.In addition,Ce can affect the microhardness of Mn18Cr18N steel by affecting as-cast and hot deformation microstructures. | Yushuo Li Yanwu Dong Zhouhua Jiang Qingfei Tang Shuyang Du Zhiwen Hou | 2023 | International Journal of Minerals,Metallurgy and Materials2023，30，2： | 4 |
| 6 | Role of Co in formation of Ni-Ti clusters in maraging stainless steel显示文摘The effect of Co addition on the formation of Ni-Ti clusters in maraging stainless steel was studied by three dimensional atom probe(3 DAP) and first-principles calculation. The cluster analysis based on the maximum separation approach showed an increase in size but a decrease in density of Ni-Ti clusters with increasing the Co content. The first-principles calculation indicated weaker Co-Ni(Co-Ti) interactions than Co-Ti(Fe-Ti) interactions, which should be the essential reason for the change of distribution characteristics of Ni-Ti clusters in bcc Fe caused by Co addition. | Jialong Tian M.Babar Shahzad Wei Wang Lichang Yin Zhouhua Jiang Ke Yang | 2018 | Journal of Materials Science & Technology2018，34，9： | 4 |
| 7 | Refinement mechanism of cerium addition on solidification structure and sigma phase of super austenitic stainless steel S32654显示文摘The influence of Ce addition on the solidification structure and σphase of super austenitic stainless steel S32654 was systematically investigated via microstructural characterization and thermodynamic calcula- tion. The results indicate that a small addition of Ce could modify MgO and MnS into Ce-bearing inclu- sions Ce_(2)O_(3)and Ce_(2)O_(2)S. Ce addition led to noticeable refinement of both the dendrite structure and σphase. The refinement mechanism could be attributed to the combined actions of effective Ce-bearing inclusions and solute Ce. Effective Ce-bearing inclusions could serve as heterogeneous nucleation cores of austenite as well as σphase, which provided a favorable prerequisite for their refinement. Solute Ce significantly enhanced the undercooling degree of the system, further promoting dendrite structure re- finement. Meanwhile, solute Ce improved the eutectic precipitation conditions of σphase and further promoted its nucleation, while the dendrite refinement limited its growth space. Finally, more fine and dispersed σphase particles formed in S32654 with Ce addition. The refinement of dendrite structure and σ phase will reduce the temperature and time required for high-temperature homogenization, which is beneficial to the hot working of this steel. | Shucai Zhang Jiangtao Yu Huabing Li Zhouhua Jiang Yifeng Geng Hao Feng Binbin Zhang Hongchun Zhu | 2022 | Journal of Materials Science & Technology2022，，7： | 3 |
| 8 | Multiphase microstructure formation and its effect on fracture behavior of medium carbon high silicon high strength steel显示文摘This work investigated the evolution of multiphase microstructure and impact fracture behavior of medium carbon high silicon high strength steel subjected to the austempering treatment at 240,360,and400℃.The results show that martensite,bainite,and retained austenite(RA)are the main microstructural phases.The austempering treatments at 360 and 400℃ caused the formation of carbon-poor ferrite in the matrix,and the transformation of ultrafine bainite into coarse lath bainite and granular bainite,respectively.Thick filmy RA was distributed between bainite laths.The polygonal martensiteaustenite islands and blocky RA formed along the grain boundaries.The average carbon concentration in the matrix decreased with the temperature increase,while the impact toughness initially increased and then dropped with temperature.The quasi-cleavage brittle fracture dominated the impact fracture mechanism of the sample austempered at 240℃ by forming tearing surfaces and tearing steps.The microcracks disappeared in the RA on the prior austenite grain boundaries.On the other side,the fracture surface of the sample austempered at 360℃ exhibited ductile fracture with deep dimples and brittle fracture with cleavage river patterns.The polygonal martensite-austenite islands or blocky RA constrained the microcracks.After austempered at 400℃,the brittle fracture was dominant,showing river patterns,and the microcracks propagated through the granular bainite without any resistance. | Kui Chen Huabing Li Zhouhua Jiang Fubin Liu Congpeng Kang Xiaodong Ma Baojun Zhao | 2021 | Journal of Materials Science & Technology2021，，13： | 3 |
| 9 | Influence mechanism of boron segregation on the microstructure evolution and hot ductility of super austenitic stainless steel S32654显示文摘Influence mechanism of B segregation on the microstructure evolution and hot ductility of S32654 at850-1250℃was systematically investigated through experimental research and theoretical calculation.The results demonstrated that the segregation of B at grain boundary(GB)played different roles in the microstructure evolution and hot ductility at various temperatures.At 850℃,B segregation inhibited Mo segregation at the GB and enhanced the GB cohesion.At 900-950℃,B segregation restricted the diffusion and segregation of Mo to the GB,inhibiting the precipitation ofσphase.At 1000-1050℃,B segregation accelerated the dislocation accumulation and limited the GB migration,promoting the nucleation and inhibiting the growth of DRX grains.At 1100-1150℃,B has little effect on the DRX due to sufficient energy supply by higher temperature.Under the above beneficial effects of B,the hot ductility of S32654 was improved to varying degrees at 850-1150℃.However,as the temperature increased to1200-1250℃,B segregation decreased the solidus temperature and enhanced the liquefaction cracking tendency,resulting in a deterioration of the hot ductility. | Jiangtao Yu Shucai Zhang Huabing Li Zhouhua Jiang Hao Feng Panpan Xu Peide Han | 2022 | Journal of Materials Science & Technology2022，，17： | 2 |
| 10 | Development and investigation of electroslag continuous casting显示文摘The principle and technological design of electroslag continuous casting (ESCC), including bifilar mode, T-shaped mould, and metal level detecting system, are detailed. Remelting was carried out for 1Cr18Ni9Ti stainless steel with ESCC. The surface fin-ish, chemical composition, macro-and microstructures, and inclusions of the remelted billets were characterized. ESCC reduces the cost and increases the productivity in comparison to traditional ESR, while achieves comparably excellent products. | Ximin Zang Zhouhua Jiang Tieyi Pan | 2007 | Journal of University of Science and Technology Beijing2007，14，4： | 1 |
| 11 | Systematic analysis of clinical relevance and molecular characterization of m^(6)A in COVID-19 patients显示文摘N6-methyladenosine(m6A)is the most prevalent post-transcriptional RNA modification in mRNA and long non-coding RNAs of eukaryotes,and its biological functions are mediated by m6A writers,erasers and readers.1 A nuclear methyltransferase complex consisting of METTL3,METTL14,WTAP,VIRMA,ZC3H13,RBM15(or RBM15B),YWHAG,TRA2A and CAPRIN1 catalyzes the m6A modifications,acting as m6A writers.1 m6A demethylase ALKBH5 as well as m6A demethylase FTO mediate the demethylation of m6As,acting as the m6A erasers. | Sanqi An Zhouhua Xie Yanyan Liao Junjun Jiang Wenyi Dong Fuqiang Yin Wen-Xing Li Li Ye Jianyan Lin Hao Liang | 2022 | Genes & Diseases2022，9，5： | 1 |
| 12 | Hydro- gen Permeability of Slags Containing Calcium Fluoride显示文摘 | Dong Yanwu Jiang Zhouhua Liang Lianke | 2011 | J Cent South Univ Technol2011，18，4： | 1 |
| 13 | Hydro gen Pick-Up During Electroslag Remelting Process显示文摘 | Zhouhua Jiang Yanwu Dong Lianke Liang | 2011 | Jour hal of Iron and Steel Research International2011，18，4： | 1 |
| 14 | Enhanced strength and toughness of high nitrogen stainless bearing steel by controlling interstitial partitioning via V-microalloying显示文摘High-nitrogen stainless bearing steel(HNSBS)with ultra-high tensile strength(∼2403 MPa)and good toughness(∼80.0 J)was obtained by V-microalloying,overcoming the strength-toughness trade-off of conventional V-free HNSBS.In this work,since V-microalloying facilitated the enrichment of interstitial atoms(C and N)in precipitates,the content of interstitial atoms in the matrix was reduced accordingly(i.e.,interstitial partitioning).On the one hand,V-microalloying reduced the substantial intergranular precipitates and transformed the precipitates from M_(23)C_(6)+M_(2)N into V-containing M_(23)C_(6)+M_(2)N+MN with multi-scale particle sizes,causing a coupling strengthening effect,which contributed to the toughness and additional strength increase.On the other hand,V-microalloying controlled interstitial partitioning,effectively refined coarse retained austenite(RA),increased the fraction of dislocation martensite,and reduced the fraction of twin martensite.The more film-like RA and dislocation martensite with high dislocation density coordinated plastic deformation and prevented crack propagation,thus obviously enhancing the strength and toughness of 0.2 V steel.This study provides a new route to develop high-performance HNSBS for aerospace applications. | Lingfeng Xia Huabing Li Hao Feng Zhouhua Jiang Hongchun Zhu Shucai Zhang Xiaodong Wang | 2023 | Journal of Materials Science & Technology2023，，20： | 1 |
| 15 | Research on the Surface Quality of ESR Large Slab Ingots 显示文摘 | Jiang Zhouhua Geng Xin | 2011 | Advanced Materials Research2011，，146147： | 1 |
| 16 | Evolution of Microstructures and Mechanical Properties of Zr-Containing Y-CLAM During Thermal Aging显示文摘The thermal stability and mechanical properties of China low activation martensitic steel with Zr and Y were investigated via thermal aging at 550 °C for 8000 h. The Laves phase content monotonically increased with thermal aging, and the volume fraction of the Laves phases stabilized in the alloy after 3000 h of thermal aging. The observed degradation in mechanical properties was because of the coarsening of M23C6 carbides and matrix grains during the earlier stages of thermal aging. The precipitation of Laves phases and V3Zr3C particles increased the strength and hardness of the alloy. Grain coarsening was the primary reason for the decrease in impact properties, and the ductile-to-brittle transition temperature increased from-71 to -48 °C after 8000 h of thermal aging. | Dongping Zhan Guoxing Qiu Changsheng Li Yongkun Yang Zhouhua Jiang Huishu Zhang | 2020 | Acta Metallurgica Sinica(English Letters)2020，33，6： | 1 |
| 17 | Simulation of multi - electrode EStk process for manufacturing large ingot 显示文摘 | Dong Yanwu Jiang Zhouhua Liu Hui | 2012 | ISIJ International2012，52，12： | 1 |
| 18 | Mathematical modelling of producing hollow ingot by electroslag casting with liquid metal 显示文摘 | Dong Yanwu Zheng Lichun Jiang Zhouhua | 2013 | Ironmaking and Steelmaking2013，40，2： | 1 |
| 19 | Enhanced strength-ductility synergy via high dislocation density-induced strain hardening in nitrogen interstitial CrMnFeCoNi high-entropy alloy显示文摘The present work demonstrates that nitrogen doping inhibits the formation of deformation twins in a CrMnFeCoNi high entropy alloy,while significantly increases the strength without sacrificing much duc-tility at 77 K.Microstructural characterization and first-principles calculations were employed to unveil the role of interstitial nitrogen atoms in obtaining such an excellent combination of strength and ductility at 77 K.It is found that nitrogen addition increases generalized stacking fault energy(GSFE)and reduces twinning.However,the pinning of dislocations by nitrogen atoms effectively suppresses dislocation cross-slip and dynamic recovery and in turn,promotes the accumulation of dislocations.The high dislocation density induces a high strain hardening capacity and improves uniform elongation,which compensates for the ductility loss accompanied by solid solution strengthening.The effect of nitrogen doping enriches the design concept of high-and medium-entropy alloys,providing an economical and effective strategy to develop ultra-high-performance alloys that are suitable for cryogenic applications. | Huabing Li Yu Han Hao Feng Gang Zhou Zhouhua Jiang Minghui Cai Yizhuang Li Mingxin Huang | 2023 | Journal of Materials Science & Technology2023，，10： | 0 |
| 20 | Infuence of Mg on Thermoplasticity of High-Temperature Stainless Bearing Steel Cr_(14)Mo_4显示文摘Through the addition of appropriate amount of Mg(0.01e0.015 wt%) to the stainless bearing steel Cr14Mo4,the high-temperature thermoplasticity of steel was improved.The mechanism has been uncovered that the added Mg plays an important role in refining and uniforming the carbide precipitations in the steel.It has been found that the segregation of trace Mg is the key to improve the dispersed carbide.Moreover,considerable segregation of Mg in steel during annealing was evidenced by the theoretic analysis. | Wei Gong Cheng Wang Haidong Wang Zhouhua Jiang | 2013 | Journal of Materials Science & Technology2013，29，12： | 0 |
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