![]() |
个人信息Personal Information
副教授
博士生导师
硕士生导师
性别:男
毕业院校:东北大学
学位:博士
所在单位:材料科学与工程学院
学科:材料学. 材料加工工程
电子邮箱:Zhangchi@dlut.edu.cn
The kinetics and cellular automaton modeling of dynamic recrystallization behavior of a medium carbon Cr-Ni-Mo alloyed steel in hot working process
点击次数:
论文类型:期刊论文
发表时间:2016-12-15
发表刊物:MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
收录刊物:SCIE、EI、Scopus
卷号:678
页面范围:33-43
ISSN号:0921-5093
关键字:Medium carbon steel; Hot deformation; Dynamic recrystallization; Cellular automaton
摘要:The dynamic recrystallization (DRX) behavior of a medium carbon Cr-Ni-Mo alloyed steel 34CrNiMo was studied in the wide temperature range of 900-1150 degrees C and the strain rate of 0.002-5 s(-1). Based on relations between the strain hardening rate and stress, the characteristic points, including critical strain (epsilon(c)), critical stress (sigma(c)), peak strain (epsilon(p)), peak stress (sigma(p)), were determined from the strain rate hardening versus stress curves. The Avrami equation was developed to model the kinetics of DRX, whereas the characteristic points can be expressed as a function of Zener-Hollomon parameter. Then the austenite grain size of DRX was measured by metallography and found to be a power law function of Zener-Hollomon parameter with an exponent of -0.2013. Besides, a mesoscopic cellular automaton model has been established to simulate the austenite DRX for the tested steel. This model was verified by means of the kinetics and topology of DRX. (C) 2016 Elsevier B.V. All rights reserved.