铸态双相不锈钢高应变率下热变形流变应力预测模型  

Prediction model of flow stress behavior for casted duplex stainless steel during hot deformation at high strain rates

作　　者：陈雷[1] 张英杰[1] 李飞[1] 裴建明[1] 毛天桥 孙登月[1] 

机构地区：[1]燕山大学国家冷轧板带装备及工艺工程技术研究中心,河北秦皇岛066004

出　　处：《材料热处理学报》2016年第6期228-234,共7页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金(51101136);河北省高等学校科学技术研究青年基金(QN2014107);国家冷轧板带装备及工艺工程技术研究中心开放课题(NECSR-201501);河北省高等学校创新团队领军人才培养计划(LJRC012);河北省高等学校创新团队领军人才培养计划(LJRC012);河北省自然科学基金-钢铁联合基金(E2016203284)

摘　　要：采用热压缩试验研究了22Cr铸态双相不锈钢在变形温度为1000～1200℃,应变速率为1～50 s-1条件下的热变形行为。为了准确的表征双相不锈钢热变形过程中的力学行为,修正了热压缩过程中摩擦和变形热效应引起的流变应力误差。在此基础上建立了双相不锈钢的流变应力预测模型。该模型通过考虑应变对材料常数（α、n、Q和ln A）的影响,进一步获得了双相不锈钢热变形过程中流变应力与变形温度、应变速率和应变的关系。结果表明：所建立的模型能较好的预测双相不锈钢的热变形行为,预测值与实验值的相关系数为0.995,平均相对误差为4.48%。Hot deformation behaviors of as-cast duplex stainless steel 22 Cr were investigated at 1000-1200 ℃ and strain rates of 1-50 s-1by hot compression test.In order to accurately characterize mechanical behavior of the duplex stainless steel during hot deformation,the errors in flow stress caused by friction and thermal effect were corrected.The prediction model of flow stress behavior for the steel was established based on the corrected data.By considering the effect of true strain on material constants（α、n、Q and ln A）,the relationship between flow stress and deformation temperature,strain rate and strain of the duplex stainless steel during hot deformation was obtained.The results show that the established model can predict the hot deformation behavior of the as-cast duplex stainless steel,the correlation coefficient and average relative error of predicted and measured values are 0.995 and 4.48%,respectively.

关 键 词：铸态双相不锈钢 高应变速率 修正 热变形 流变应力模型 

分 类 号：TG142.71[一般工业技术—材料科学与工程]