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X46级管线钢热连轧过程中结晶组织演变及流变应力的预测
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作者 周家林 李立新 +1 位作者 罗钢 闫文青 《武汉科技大学学报》 CAS 2004年第2期120-123,共4页
开发描述含铌微合金钢软化行为的再结晶及形变诱导析出模型,并对奥氏体再结晶动力学和结晶组织演变进行了模拟计算。在此基础上建立了计算精轧过程应力 应变曲线的流变应力模型,根据现场数据预测了X46级管线钢精轧过程中的轧制压力。结... 开发描述含铌微合金钢软化行为的再结晶及形变诱导析出模型,并对奥氏体再结晶动力学和结晶组织演变进行了模拟计算。在此基础上建立了计算精轧过程应力 应变曲线的流变应力模型,根据现场数据预测了X46级管线钢精轧过程中的轧制压力。结果表明,该模型的计算结果与实测值吻合较好,反映了工业生产的实际。 展开更多
关键词 热轧 结晶动力学 结晶组织演变 流变应力
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Dislocation density model and microstructure of 7A85 aluminum alloy during thermal deformation 被引量:10
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作者 HU Jian-liang WU Xiu-jiang +3 位作者 BO Hong JIAO Zi-teng HUANG Shi-quan JIN Miao 《Journal of Central South University》 SCIE EI CAS CSCD 2021年第10期2999-3007,共9页
The microstructure evolution of 7A85 aluminum alloy at the conditions of strain rate(0.001−1 s^(−1))and deformation temperature(250−450°C)was studied by optical microscopy(OM)and electron back scattering diffract... The microstructure evolution of 7A85 aluminum alloy at the conditions of strain rate(0.001−1 s^(−1))and deformation temperature(250−450°C)was studied by optical microscopy(OM)and electron back scattering diffraction(EBSD).Based on the K-M dislocation density model,a two-stage K-M dislocation density model of 7A85 aluminum alloy was established.The results reveal that dynamic recovery(DRV)and dynamic recrystallization(DRX)are the main mechanisms of microstructure evolution during thermal deformation of 7A85 aluminum alloy.350−400°C is the transformation zone from dynamic recovery to dynamic recrystallization.At low temperature(≤350°C),DRV is the main mechanism,while DRX mostly occurs at high temperature(≥400°C).At this point,the sensitivity of microstructure evolution to temperature is relatively high.As the temperature increased,the average misorientation angle(θˉ_(c))increased significantly,ranging from 0.93°to 7.13°.Meanwhile,the f_(LAGBs) decreased with the highest decrease of 24%. 展开更多
关键词 hot deformation microstructure evolution dynamic recrystallization dislocation density model
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Hot compression deformation behavior and microstructural characteristics of high-purity silver
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作者 YAO Ying-jun WEN Jing +3 位作者 YAN Shuai-jiang WANG Ri-chu PENG Xiang CAI Zhi-yong 《Journal of Central South University》 2025年第6期2051-2070,共20页
High-purity silver(Ag)is extensively utilized in electronics,aerospace,and other advanced industries due to its excellent thermal conductivity,electrical conductivity,and machinability.However,the prohibitive material... High-purity silver(Ag)is extensively utilized in electronics,aerospace,and other advanced industries due to its excellent thermal conductivity,electrical conductivity,and machinability.However,the prohibitive material cost poses substantial challenges for optimizing thermal processing parameters through repetitive experimental trials.In this work,hot compression experiments on high-purity silver were conducted using a Gleeble-3800 thermal simulator.The high temperature deformation behaviors,dynamic recovery(DRV)and dynamic recrystallization(DRX)of high-purity silver were studied by constructing an Arrhenius constitutive equation and developing thermal processing maps.The results show that plastic instability of high-purity silver occurs at high strain rates and the optimized hot processing parameters are the strain rate below 0.001 s^(−1) and the temperature of 340−400℃.Microstructural observations exhibit that DRV prefers to occur at lower deformation temperatures(e.g.,250℃).This is attributed to the low stacking fault energy of high-purity silver,which facilitates the decomposition of dislocations into partial dislocations and promotes high-density dislocation accumulation.Furthermore,DRX in high-purity silver becomes increasingly pronounced with increasing deformation temperature and reaches saturation at 350℃. 展开更多
关键词 high-purity silver deformation behavior dynamic recovery dynamic recrystallization processing map microstructural evolution
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