节镍型高氮奥氏体不锈钢应变硬化行为  

Strain hardening behavior on low-nickel high nitrogen austenitic stainless steel

作　　者：翟永臻 袁建路[2] 赵英利 嵇爽 张坤 裴建明 Zhai Yongzhen;Yuan Jianlu;Zhao Yingli;Ji Shuang;Zhang Kun;Pei Jianming(HBIS Group Technology Research Institute,Shijiazhuang 050000,China;Department of Materials Engineering,Hebei College of Industry and Technology,Shijiazhuang 050000,China;CITIC Dicastal Co.,Ltd.,Qinhuangdao 066011,China)

机构地区：[1]河钢集团钢研总院,河北石家庄050000 [2]河北工业职业技术学院材料工程系,河北石家庄050000 [3]中信戴卡股份有限公司,河北秦皇岛066011

出　　处：《锻压技术》2019年第11期181-185,190,共6页Forging & Stamping Technology

摘　　要：为研究冷变形及碳含量对节镍型高氮奥氏体不锈钢应变硬化的影响规律,选取2种碳含量和6种变形量的节镍型高氮奥氏体不锈钢进行拉伸实验,根据实验结果绘制工程应力-工程应变曲线,结合实验结果及微观组织分析,得出结论:高氮奥氏体不锈钢在冷轧过程中,随着变形量增加,屈服强度及抗拉强度均呈现大幅度上升,但伸长率逐渐降低。随着奥氏体晶粒拉长,微观组织中孪晶密度随着变形量的加大而增加,变形孪晶破坏,孪晶在滑移分割作用下呈现条带状。对比不同变形量的冷轧材料拉伸结果,屈强比随冷变形量的增加而增加。在小变形量(10%~20%)时,加工硬化值随着碳含量的增加而减小;当变形量较大时,随着应变量的增加,含碳量高的实验钢表现出更强的加工硬化。In order to study the influence rules of cold deformation and carbon content on the strain hardening of low-nickel high nitrogen austenitic stainless steel,two kinds of carbon contents and six kinds of deformation amounts of low-nickel high nitrogen austenitic stainless steel were selected for tensile test.Based on the test results,the engineering stress-engineering strain curves were drawn.Combining with the test results and microstructure analysis,the conclusion shows that in the cold rolling process of high nitrogen austenitic stainless steel,the yield strength and tensile strength increase greatly with the increasing of deformation amount,but the elongation decreases.However,with the increasing of austenite grain elongation,the twin density in the microstructure increases with the increasing of deformation amount,the deformation twin is destroyed,and the twin appears strip-like due to slip splitting.Comparing the tensile results of cold rolled materials with different deformation amounts,the yield-strength ratio increases with the increasing of cold deformation amount.When the deformation amount is small(10%-20%),the work hardening value decreases with the increasing of carbon content,but when the deformation amount is larger,the test steel with high carbon content shows stronger work hardening with the increasing of strain.

关 键 词：节镍型高氮奥氏体不锈钢 碳含量 变形量 拉伸实验 微观组织 加工硬化 

分 类 号：TG142.1[一般工业技术—材料科学与工程]