第43卷第1期 Vol. 43
No.1
饭
压技
FORGING & STAMPING TECHNOLOGY
30Cr钢高温变形流变应力模型
成2
肖艳红'，
郭
（1.上海第二工业大学工学部，上海201209；2.西安交通大学机械工程学院，陕西西安710049）
2018年1月 Jan.2018
摘要：30Cr钢常用于大型阀体锻件，利用Gleeble-1500实验机对30Cr钢进行热模拟压缩实验，获得应变速率为0.1，0.5， 2.5和10s-1，变形温度为1000，1050，1100，1150和1200%，压缩变形量为60%条件下的30Cr钢的真应力-真应变曲线，实验结果表明，高温流变应力随着变形温度的增加和应变速率的降低面减小，在一定的变形条件下，呈现出典型的单峰型动态再结晶的应力-应变曲线特征。采用Arhenius双曲正弦关系描述30Cr钢的高温流变行为，确定其热变形激活能，建立了 30Cr钢的流变应力模型，其结果可为大型阀体模锻成形工艺的数值模拟和工艺参数的确定提供参考、
关键词：大型阀体；流变应力；本构方程；多向模锻工艺；热压缩 DOI: 10. 13330/j. issn. 1000-3940. 2018. 01. 030
中图分类号：TG113
文献标识码：A
文章编号：1000-3940（2018）01-0176-05
Flowstressmodelforsteel30Crduringhotdeformation
Xiao Yanhong', Guo Cheng
(1. College of Engineering, Shanghai Polytechnie: University , Shanghai 201209, China; 2. School of Mechanical Engineering, Xi'an Jiaotong University, Xi'an 710049, China )
Abstract : Steel 30Cr is used to forge the large valve. A set of hot compression experiment on steel 30Cr was conducted by Gleeble-1500 thermal-mechanical simulator, and the true stress-true strain cunes were achieved with strain rates of 0. 1, 0. 5, 2. 5 and 10 s-1, deform-ation temperatures of 1000, 1050 , 1100, 1150 and 1200 °C and deformation degree of 60% , respectively. The experimental results show that the flow stress at high temperature decreases with the increasing of deformation temperature and the decreasing of strain rate, and in the certain deformation conditions, the typical characteristics of true stress-true strain curves of dynamic recrystallization with single peak appears. Furthemore, the rheologieal behavior at hight tempenature of seel 30Cr was desecribed by the Arhenius byperbolic sine relation-ship, and the activation energy of bot deformation was confirmed. Finally , the flow stress model of steel 30Cr was established. The results
can provide good reference for numerical simulation and determination of process parameters for die forging of large valve. Key words : large valve; flow stress; constitutive equation; multi-directional die forging process; hot compression
大型阀体多用于核电、火电和天然气输送管道收稿日期：20170726；修订日期：20171010
基金项目：上海市教委青年教师资助计划（A30DB1621009-52）；校（1091IZIXX）自工与博，
作者筒介：肖艳红（1983-），女，博士，讲师 E-mail: yhsiao@ sspa. edu. en
通讯作者：鄂成（1948-），男，博士，教授，博士生导师 E-mail : gch@ mail. xjta. edu. cn
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