摘要
利用JMatPro11.0热力模拟软件、Gleeble-3500热力模拟试验机研究了022Cr22Ni5Mo3N双相不锈钢的高温热变形行为,揭示了其在1000~1150℃,0.01~5 s^(-1)下的热变形特征。结果表明:022Cr22Ni5Mo3N双相不锈钢的热变形温度应大于脆性σ相的溶解温度,即980℃;其次,材料的流变应力随变形温度的升高和应变速率的降低而减小。基于动态材料模型构筑了材料的热加工图,并结合微观组织进行了验证。其最佳热加工窗口为1090~1125℃、0.01~0.03 s^(-1),该区域对应的组织特征为:两相组织均匀,奥氏体相发生充分动态再结晶且组织中不存在σ相;在失稳参数1100℃、5 s^(-1)条件下,组织中两相晶粒被明显拉长且再结晶比例低,相界处的析出物易诱发裂纹。因此实际加工参数应接近最佳热加工工艺窗口,避免失稳区参数及σ相的应变析出。
The high temperature hot deformation behavior of 022Cr22Ni5Mo3N duplex stainless steel was investigated by JMatPro11.0 thermal mechanicl simulator software and Gleeble-3500 thermal mechanical simulator to reveal its hot deformation characteristics at 1000-1150℃and strain rate of 0.01-5 s^(-1).The results show that the hot deformation temperature of 022Cr22Ni5Mo3N duplex stainless steel should be greater than the dissolution temperature of the brittleσphase,which is 980℃.Secondly,the flow stress of the material decreases with the increase of deformation temperature and the decrease of strain rate.The hot processing maps of the material were constructed based on the dynamic material model and verified combined with microstructure.The optimal hot processing window is 1090-1125℃,0.01-0.03 s^(-1),which corresponds to the following organizational characteristics:the two-phase organization is homogeneous,the austenite phase undergoes sufficient dynamic recrystallization,and theσphase does not exist in the microstructure.With the instability parameter of 1100℃and 5 s^(-1),the two-phase grains in the microstructure are stretched and the recrystallization ratio is low,and the precipitation at the phase boundaries is easy to induce crack.Therefore,the actual processing parameters should be close to the optimal hot processing process window to avoid the parameters of the instability zone and the strain precipitation ofσphase.
作者
周洲
崔力云
钱喜根
孙希
刘恒
刘庆涛
袁志钟
罗锐
ZHOU Zhou;CUI Li-yun;QIAN Xi-gen;SUN Xi;LIU Heng;LIU Qing-tao;YUAN Zhi-zhong;LUO Rui(School of Materials Science and Engineering,Jiangsu University,Zhenjiang 212013,China;Jiangsu Fujie High-End Equipment Manufacturing(Group)Co.,Ltd.,Suzhou 215233,China)
出处
《塑性工程学报》
CAS
CSCD
北大核心
2024年第8期125-132,共8页
Journal of Plasticity Engineering
基金
江苏省自然科学基金资助项目(BK20220548)
重庆大学机械传动国家重点实验室资助项目(SKLMT-MSKFKT-202219)
北京科技大学新金属材料国家重点实验室资助项目(2022-Z21)。
关键词
双相不锈钢
流动真应力-真应变曲线
本构方程
热加工图
duplex stainless steel
flow true stress-true strain curve
constitutive equation
hot processing map
