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Hot Deformation Behavior and Dynamic Recrystallization Characteristics in a Low-Alloy High-Strength Ni–Cr–Mo–V Steel

查看全文 作　　者：Chuan [1]Wu;Shuang [2]Han 高影响力作者 机构地区：[1]National-Local Joint Engineering Laboratory of Intelligent Manufacturing Oriented Automobile Die & Mould,College of Mechanical Engineering,Tianjin University of Technology and Education;[2]College of Mechanical Engineering,Yanshan University高影响力机构 出　　处：《Acta Metallurgica Sinica(English Letters)》索引2018年第31卷第9期,共12页高影响力期刊 基　　金：supported financially by the Scientific Research Foundation of Tianjin University of Technology and Education (No.KYQD1801);the National Natural Science Foundation of Tianjin City (No.13JCYBJC38900) 摘　　要：This study presented a quantitative investigation of deformation behavior and dynamic recrystallization of low-alloy highstrength Ni–Cr–Mo–V steels during hot deformation.A series of isothermal compression experiments were performed at temperatures ranging from 800 to 1200°C and strain rates from 0.01 to 10 s^(-1)with a height reduction of 60%.A complete Arrhenius constitutive model and processing maps were developed.The results showed that the constitutive model had the ability to predict the flow stress with an average absolute relative error of\5.7%.The processing maps constructed at strains of 0.2,0.4,and 0.8 showed that flow instability was prone to occur at higher strain.Dynamic recrystallization tended to take place at higher temperatures(900–1200°C)and lower strain rates(0.01–1 s^(-1)).The critical strain for the onset of dynamic recrystallization was determined,and a kinetics model was developed.The predicted results for recrystallization volume fraction and flow stress were compared with the experimental data,which indicated that the model was accurate and reliable. 关 键 词：低合金 结晶特征 行为 高张力 ARRHENIUS 动力学模型 动态再结晶 流动不稳定性
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