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| 1 | 淬火介质对42CrMo钢棒淬火组织及硬度影响的数值模拟及试验验证显示文摘基于有限元计算分析了直径为Φ40 mm的42CrMo钢圆棒试样分别使用淬火油和PAG水基液淬火后试样不同位置的组织、硬度以及淬火过程中的温度变化,采用硬度检测和显微组织分析对模拟结果进行了验证。结果表明,当使用淬火油淬火时,试样表面由奥氏体向马氏体和贝氏体转变,心部由奥氏体向贝氏体转变;当使用PAG水基液淬火时,试样表层几乎转变成马氏体,心部转变成马氏体和贝氏体;试样经淬火油和PAG水基液淬火后,表面硬度分别为58和55 HRC,均由表面至心部硬度逐渐降低,但使用PAG水基液淬火后试样的心部硬度比用淬火油的高5 HRC,约为50 HRC。 | 张文 朱百智 黄振建 王兆华 | 2020 | 金属热处理2020，45，1： | 12 |
| 2 | 20CrMnTi钢齿轮渗碳淬火的数值模拟与实验验证显示文摘采用DEFORM‐HT软件,对20CrMnTi钢齿轮的渗碳、淬火热处理工艺过程进行模拟,得出其渗碳后表层到心部碳质量分数变化。分析淬火后马氏体组织变化,并分析淬火后残余应力,选择适当的淬火冷却介质,通过试验测定其金相组织及表面至心部的洛氏硬度。结果表明,金相组织、洛氏硬度与模拟预测结果较吻合,对生产具有一定的指导意义。 | 赵爱彬 张园园 李荣华 | 2022 | 辽宁石油化工大学学报2022，42，1： | 2 |
| 3 | PPB structure elimination,DRX nucleation mechanisms and grain growth behavior of the3rd-generation PM superalloy for manufacturing aviation components显示文摘Previous Particle Boundary(PPB),as the detrimental structure in Powder Metallurgy(PM)components,should be eliminated by subsequent hot process to improve the mechanical properties.The objective is to investigate the Dynamic Recrystallization(DRX)nucleation mechanisms and grain growth behavior of the 3rd-generation PM superalloy with PPB structure.Microstructure observation reveals that PPB decorated with(Ti,Ta,Nb)C carbides belongs to the discontinuous chain-like structure.The elimination of PPB networks can be achieved effectively via hot deformation due to the occurrence of DRX.Four different DRX nucleation mechanisms were proposed and discussed in detail according to the special microstructure characteristics of the PM superalloy.Firstly,local lattice rotations can be detected in the vicinity of(Ti,Ta,Nb)C carbides during hot deformation and thus PPB structure serves as the preferential nucleation sites for DRX grains via Particle-Stimulated Nucleation(PSN).Then,Discontinuous-DRX(DDRX)characterized by grain boundary bulging dominates the microstructure refinement and Continuous-DRX(CDRX)operated by subgrain rotation can be regarded as an important assistant mechanism.At last,the initial Σ3 boundaries would lose their twin characteristics owing to the crystal rotation and then transform into the general High Angle Grain Boundaries(HAGBs).The distorted twins provide additional DRX nucleation sites,viz.,twin-assisted nucleation.Particular attention was focused on the grain growth behavior of the PM superalloy in subsequent annealing process.The recrystallization temperature was determined to be about 1110.C and 1140.C can be considered as the critical temperature for grain growth.The findings would provide theoretical support for microstructure refinement of the 3rd-generation PM superalloy,which is of pivotal significance for improving the mechanical properties of aviation components. | Baoyun ZHANG Yongquan NING Zhaotian WANG Qiaomu LIU | 2024 | Chinese Journal of Aeronautics2024，37，1： | 0 |
| 4 | TC21钛合金热压缩工艺数值模拟与实验研究显示文摘对TC21钛合金在两相区进行了不同变形温度(830~920℃)和应变速率(0.01~1 s^(-1))下的热压缩实验,利用金相法和DEFORM-3D有限元模拟软件对合金在上述热变形条件下的热压缩过程进行了数值模拟研究。实验结果表明,随着变形温度的上升和应变速率的下降,合金α片层组织的球化体积分数不断增加。模拟结果表明,随着变形温度的上升和应变速率的下降,合金的等效应变和α片层组织的再结晶体积分数不断提高,等效应变和再结晶体积分数的最大都发生在合金的中心部位。当应变速率为0.1 s^(-1)、变形温度为920℃时,模拟获得的再结晶体积分数为40%,模拟结果和实验结果呈现较高的吻合度。将有限元模拟和热变形参数边界条件相结合,能够优化外部工艺条件。 | 陶成 崔霞 欧阳德来 万兴才 谢有美 刘林涛 姜建飞 | 2023 | 塑性工程学报2023，30，8： | 0 |
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