摘要
目的研究SUS304奥氏体不锈钢的热变形行为。方法在GLEEBLE-3500热力模拟实验机上对SUS304不锈钢进行了等温热压缩实验,变形温度为850~1250℃,应变速率为0.01,0.1,1 s^(-1),真应变为0.69,基于Arrhenius模型构建了本构方程,并建立了3D热加工图。结果实验钢在850~1050℃/0.1~1s^(-1)条件下的热变形机制主要为动态回复,在1050~1200℃/0.01~0.1 s^(-1)条件下为动态再结晶;热变形激活能为505 kJ/mol,预测应力与实验应力的线性相关系数R2为0.9878。结论在真应变为0.69时,SUS304不锈钢热加工的优选区间为1000~1100℃/0.01~0.02 s^(-1),变形主导机制为动态再结晶。
This paper aims to investigate the rheological behavior of SUS304 at high temperature.The isothermal compression of SUS304 austenite stainless steel was carried out by Gleeble-3500 thermal simulator at deformation temperature of 850-1200℃,strain rate of 0.01-1 s^(-1)and true strain of 0.69.The Arrhenius-type constitutive equations based on the data of peak flow stress and the 3D hot processing map were established.The results show that high temperature(1050-1200℃)and low strain rate(0.01-0.1 s^(-1))benefit the occurrence of dynamic recrystallization;The main softening mechanism is dynamic recovery at conditions of 850-1050℃/0.1-1 s^(-1).The apparent activation energy is 505 kJ/mol and the correlation coefficient(R2)considered to be linear relationship between the predicted and experimental flow stress is 0.9878.The optimized hot processing parameter is 0.69/1000-1100℃/0.01-0.02 s^(-1),and the main mechanism of deformation is dynamic recrystallization.
作者
丁浩晨
赵艳君
胡治流
张敬瑞
庞兴志
DING Hao-chen;ZHAO Yan-jun;HU Zhi-liu;ZHANG Jing-rui;PANG Xing-zhi(School of Resources,Environment and Materials,Guangxi University,Nanning 530004,China;Guangxi Key Laboratory of Processing for Non-Ferrous Metals and Featured Materials,Guangxi University,Nanning 530004,China)
出处
《精密成形工程》
北大核心
2021年第3期97-103,共7页
Journal of Netshape Forming Engineering
基金
广西创新驱动项目(AA18242003-3)
国家自然科学基金(51661004)
广西有色金属及特色材料加工重点实验室项目(GXYSSF1809)。
关键词
奥氏体不锈钢
3D热加工图
热变形
动态再结晶
austenite stainless steel
3D processing map
hot deformation
dynamic recrystallization
