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| 1 | Microstructure and Properties of Low Temperature Composite Chromized Layer on H13 Tool Steel显示文摘Low temperature composite chromizing is a process composed of a plain ion-carbonitriding or ion-nitriding at 550~580℃, followed by a low-temperature chromizing in a salt-bath of 590℃. The microstructure and properties of the low temperature composite chromized layer on H13 tool steel were investigated using metallography,X-ray diffraction, microanalysis, hardness and wear tests. It was found that this low temperature process was thermodynamically and kinetically possible, and the composite chromized layer on H13 steel, with a thickness of 3~6μm,consisted of three sub-layers (bands), viz. the outer Cr-rich one, the intermediate (black) one, and the inner, original white layer. After chromizing, the former diffusion layer was thickened. The results of X-ray diffraction showed that the composite chromized layer contained such nitrides and carbides of chromium as CrN, Cr2N, (Cr, Fe)23C6, and (Cr, Fe)7C3, as well as plain α-(Fe, Cr). A high surface microhardness of 1450~1550 HV0.025, which is much higher than that obtained by the conventional ion carbonitriding and ion nitriding, was obtained. In addition, an excellent wear resistance was gained on the composite chromized layer. | Cuilan WU, Chengping LUO and Ganfeng ZOU College of Mechanical Engineering, South China University of Technology, Guangzhou 510641, China | 2005 | Journal of Materials Science & Technology2005，21，2： | 9 |
| 2 | Big data-enabled multiscale serviceability analysis for aging bridges显示文摘 | Yu Liang Dalei Wu Guirong Liu Yaohang Li Cuilan Gao Zhongguo John Ma Weidong Wu | 2016 | Digital Communications and Networks2016，2，3： | 5 |
| 3 | A Novel Duplex Low-temperature Chromizing Process at 500℃显示文摘在 500 °C 的一个优化低温度的渗铬过程经由由先锋血浆 nitriding 组成的一个双渗铬过程与 0.45 wt %碳在平凡的中等碳的钢上被认识到,并且跟随的盐洗澡 thermoreactive 免职和散开( TRD )有薄散开层的渗铬 process.CrN 层在下面被形成。双渗铬过程被光显微镜学(OM ) 学习,扫描电子显微镜学(SEM ) ,精力散 X 光检查光谱学(版本) , X 光检查衍射(XRD ) ,和传播电子显微镜学(TEM ) 。在 500 °C 的渗铬速度被增加更多的 Cr-Fe 粉末进盐洗澡成功地提高,这被发现,并且 CrN 层在厚度与一般水准 8.1 亩 m 以优先的氮化物混合物 layer.A CrN 层的成本形成了,在微坚硬的 1382 HV_( 0.01 )被双渗铬更为 24 h.Further 在 500 °C 在底层上形成, CrN 层由 nanocrystalline CrN 谷物组成了。 | Huiliang CAO Cuilan WU Jiangwen LIU Chengping LUO Ganfeng ZOU | 2007 | Journal of Materials Science & Technology2007，23，6： | 3 |
| 4 | Abnormal orientation relation between fcc and hcp structures revealed in a deformed high manganese steel显示文摘The crystallography of phase transformation is an important issue for studying metallic alloys.Here,we demonstrate an abnormal orientation relation between face-centered cubic(fcc) and hexagonal closepacked(hcp) phases due to the intersection of two ε_(hcp)-martensite variants in a high manganese steel.The corresponding crystallogra phic cha racteristics,including invariant line,habit plane and atomic steps,have been characterized by transmission electron micro scopy and the quasi-O-line model.In addition,the models of phase transfo rmation about the intersection are proposed based on transmission mechanisms of dislocations.Our findings enrich the theories of phase transformation and implicate the possibility to fabricate stro nger and tougher steel. | Pan Xie Shucheng Shen Cuilan Wu Jianghua Chen | 2021 | Journal of Materials Science & Technology2021，，1： | 2 |
| 5 | Influence of alloplasm on resistance to wheat scab显示文摘Using alloplasmic wheat as test materials, the genetic effect of cytoplasm on wheat scab resistance was studied by three methods including the determination of resistance of explant calli to Gibberella zeae toxin, the identification of inoculating single fixed position and the identification of field resistance. The results showed that among 'the homonucleo_heterocytoplasmic lines', resistance of calli to G. zeae toxin was different; the difference of cytoplasmic effect among different nucleoplasm combinations showed certain nucleoplasm interaction relation. Resistance of hybrid F 1 plants of reciprocal cross between alloplasmic line and disease-sensitive wheat variety to wheat scab was of clear difference. Hybrid F 1 of reciprocal cross between Ae. ventricosa cytoplasmic wheat and disease-sensitive or -resistant wheat variety all exhibited fine resistance effect of alloplasm. Compared with general common wheat variety, most alloplasmic wheats tested have stronger resistance. A few selected lines having Ae. ventricosa cytoplasm have a strong and stable resistance to scab. They can be a finer new resistant source. | Wu Yuwen Ren Shuxin Liu Chunguang Hou Ning Zhang Cuilan Zhang Yan | 1998 | Chinese Science Bulletin1998，43，12： | 2 |
| 6 | Dislocation-Induced Precipitation and Its Strengthening of Al–Cu–Li–Mg Alloys with High Mg显示文摘Generally, the good combination of pre-deformation and aging can improve the mechanical strength of the Al–Cu–Li–Mg alloys. However, the effects of pre-deformation on competitive precipitation relationship and precipitation strengthening have not been clarified in detail in Al–Cu–Li–Mg alloys with high Mg. In the present study, the effects of pre-deformation level on the microstructure and mechanical properties of an Al–2.95 Cu–1.55 Li–0.57 Mg–0.18 Zr alloy have been investigated. It is found that the introduction of dislocation by 5% pre-deformation can facilitate the precipitation of new successive composite precipitates and T _1 precipitates along the sub-grain boundaries or dislocations and inhibit the precipitation of dispersive GPB zones which is the main precipitates of the alloys without pre-deformation. The introduction of 5% pre-deformation can enhance the mechanical properties considerably. When the pre-deformation level increases from 5 to 15%, the number density of the successive composite precipitates and T _1 precipitates increases, and the aspect ratio of T _1 precipitates decreases. The decrease in T _1 precipitate aspect ratio and the increment of the successive composite precipitates result in the reduction in precipitation strengthening. Therefore, the increase in pre-deformation level from 5 to 15% does not further improve the mechanical properties of the alloys, although the dislocation strengthening increases continuously. | Xiangpeng Gong Shifang Luo Shiyong Li Cuilan Wu | 2021 | Acta Metallurgica Sinica(English Letters)2021，34，5： | 2 |
| 7 | Unusual relationship between impact toughness and grain size in a high-manganese steel显示文摘The high-manganese steels are important structural materials,owing to their excellent toughness at low temperatures.However,the microstructural causes for their unusual properties have not adequately been understood thus far.Here,we report a reversal relationship between impact toughness and grain size in a high-manganese steel and its unrevealed microscopic mechanisms,which result in an excellent low-temperature toughness of the steel.Our investigations show that with increasing grain size the impact toughness of the steel can be improved drastically,especially at low-temperatures.Advanced electron microscopy characterization reveals that the enhanced impact toughness of the coarse-grained steel is attributed to the twinning induced plasticity and transformation induced plasticity effects,which produce large quantities of deformation twins,ε_(hcp)-martensite andα'_(bcc)-martensite.Inversely,in the fine-grained steels,the formation of deformation twins and martensite is significantly inhibited,leading to the decrease of impact toughness.Microstructural characterizations also indicate thatε_(hcp)-martensite becomes more stable thanα'_(bcc)-martensite with decreasing temperature,resulting in characteristic microstructures in the coarse-grained samples after impact deformation at liquid nitrogen temperature.In the coarse-grained samples under impact deformation at-80℃,ε_(hcp)-martensite transformation,α'_(bcc)-martensite transformation and deformation twinning all occur simultaneously,which greatly improves the toughness of the steel. | Pan Xie Shucheng Shen Cuilan Wu Jiehua Li Jianghua Chen | 2021 | Journal of Materials Science & Technology2021，，30： | 2 |
| 8 | Positive Strain Rate Sensitivity and Deformation Behavior of a Fe–29Mn–3Al–3Si TWIP Steel显示文摘The Fe-29 Mn-3 Al-3 Si twin-induced plasticity(TWIP)steel is used to conduct quasi-static compression and dynamic impact deformation with strain rates ranging from 8.3×10^(-4) to 3800 s^(-1).The microstructures and properties of deformed samples under different strain rates were investigated comparatively.These results show that positive strain rate sensitivity was observed with the increase in strain rates and that there was a significant difference in strain rate sensitivity factor(m)between quasi-static compression(m=0.029)and dynamic impact deformation(m=0.190).Compared to the quasi-static compression,the dynamic impact deformation exhibited higher yield strength.Microstructural examination reveals that the primary twins were frequently found during the quasi-static compression process,and the secondary twins were rarely observed.However,the secondary and multi-fold deformation twins were florescent in the dynamic impact samples.At the initial stage of dynamic impact deformation,partial dislocations and staking faults on multiple conjugate{111}planes were simultaneously activated and produced a large number of Lomer-Cottrell dislocations,resulting in a large increase in yield strength during dynamic impact. | Shucheng Shen Cuilan Wu Pan Xie Yuanrui Liu | 2022 | Acta Metallurgica Sinica(English Letters)2022，35，11： | 1 |
| 9 | An Electron Microscopy Study of Vein-like Grain Boundary Microstructure in Nitrocarburized Low Carbon Steels显示文摘The coarsened grain boundaries(GBs) with vein-like morphology frequently appear in the nitrogen diffusion layer of nitrocarburized carbon steels.The electron probe X-ray microanalysis shows that such vein-like GBs are rich in nitrogen and carbon atoms.Transmission electron microscopy and scanning electron microscopy further reveal that the coarsened GBs consist ofγ'-nitrocarbide(Fe_4(C,N)) andε-nitrocarbide lamellas that are formed during nitrocarburizing due to high nitrogen concentration at GBs.It is shown that many of {111}<112> micro twins exist in the y'-phase lamellas and thin e-phase slices prefer to nucleate at their twin boundaries with the orientation relationship of {0001}_ε//{111}_γ'.Upon growing large y'-lamellas may become faceted and thin e-lamellas may grow thicker and become the main portions in the vein-like GBs.The microstructure evolution occurring in the vein-like GBs can be depicted as:α+[N]/[C]→>γ' +[C,N]→ε-nitrocarbides. | Wanglin Chen Cuilan Wu Jianghua Chen Aigui He | 2013 | Journal of Materials Science & Technology2013，29，7： | 1 |
| 10 | BOUNDEDNESS OF COMMUTATORS FOR MARCINKIEWICZ INTEGRALS ON WEIGHTED HERZ-TYPE HARDY SPACES显示文摘In this paper,the authors study the boundedness of the operator μ b Ω,the commutator generated by a function b ∈Lip β (R n)(0 < β < 1) and the Marcinkiewicz integral μΩ on weighted Herz-type Hardy spaces. | Cuilan Wu | 2011 | Analysis in Theory and Applications2011，27，4： | 1 |
| 11 | Improved Properties in Relation to Fine Precipitate Microstructures Tailored by Combinatorial Processes in an Al-Cu-Mg-Si Alloy显示文摘The 2xxx series Al alloys have been widely used in aerospace industry owing to their high strength,good plasticity and superior formability.To ensure a good control of shape,the quenched alloy sheets require a small pre-deformation before artificial aging.However,this pre-deformation considerably deteriorates the mechanical strength of the Al-3.0 Cu-1.8 Mg-0.5 Si(wt%)alloys due to the formation of unfavorable large-sized precipitates at dislocations.To tackle this issue,we designed a pre-aging process prior to the pre-deformation.The thermal-mechanical treatment,involving pre-aging,pre-deformation and subsequent aging,markedly enhanced the ultimate tensile strength up to 521 MPa compared to that(448 MPa)of the alloy without pre-aging.Microstructure characterization revealed that the fine precipitates(~2 nm)with a uniform dispersion were promoted within the Al matrix,which in turn partly suppressed the formation of the unfavorable large-sized precipitate(~100 nm).Our findings provide a new clue for designing stronger Al alloys with age-hardenability. | Fengjiao Niu Jianghua Chen Cuilan Wu Jing Wu Xiandong Xu Pan Xie Xiongwei Yu | 2020 | Acta Metallurgica Sinica(English Letters)2020，33，11： | 1 |
| 12 | Boundedness of Some Commutators of Marcinkiewicz Integrals on Hardy Spaces显示文摘Based on the results of the boundedness ofµ^(b)_(Ω)on L^(p) spaces,by using the theory of atomic decomposition of Hardy spaces,we obtain the boundedness ofµ^(b)_(Ω)on Hardy spaces. | Cuilan Wu | 2023 | Analysis in Theory and Applications2023，39，1： | 1 |
| 13 | Weighted Boundedness of Commutators of Generalized Calderón-Zygmund Operators显示文摘[b,T] denotes the commutator of generalized Calderon-Zygmund operators T with Lipschitz function b, where b∈Lip_β(R^n),(0 <β≤1) and T is aθ(t)-type Calderón-Zygmund operator. The commutator [b,T] generated by b and T is defined by[b,T]f(x)=b(x)Tf(x)-T(bf)(x)=∫k(x,y)(b(x)-b(y))f(y)dy.In this paper, the authors discuss the boundedness of the commutator [b, T] on weighted Hardy spaces and weighted Herz type Hardy spaces and prove that [b,T] is bounded from H^p(ω~p) to L^q(ω~q), and from HK_(q1)^(α,p)(ω_1,ω_2^(q1)) to K_(q2)^(α,p)(ω_1,ω_2^(q2)). The results extend and generalize the well-known ones in [7]. | Cuilan Wu Yunjie Wang Lisheng Shu | 2018 | Analysis in Theory and Applications2018，34，3： | 0 |
| 14 | Relationship Between the Strengthening Effect and the Morphology of Precipitates in Al–7.4Zn–1.7Mg–2.0Cu Alloy显示文摘The morphological evolution of the precipitates in Al–7.4Zn–1.7Mg–2.0Cu(wt%) alloy was studied by highresolution transmission electron microscopy(HRTEM). Statistics reveal that the hardness of the alloy changes accordingly with the change of the average thickness–diameter ratio of precipitates. The GPII zones are mainly responsible for the first and also the highest hardness peak. They grow in diameter and keep 7-atomic-layer in thickness. Once the thickness changes, the phase transformation from GPII zone to g0 or g-precursor would occur. The resultant metastable g0 and g-precursor precipitates grow in both diameter and thickness, but much faster in the former. After the first hardness peak,the metastable g0 precipitates and g-precursor, coexisting with part of GPII zones, are counted as the main hardening precipitates. | Xiubo Yang Jizi Liu Jianghua Chen Caiyun Wan Lei Fang Ping Liu Cuilan Wu | 2014 | Acta Metallurgica Sinica(English Letters)2014，27，6： | 0 |
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