高氮奥氏体钢的条件拉伸行为  

Conditioned tensile behavior of high nitrogen austenitic steel

作　　者：彭梦都 时捷[1] 崔冰[3] 孙挺[1] 李晓源[1] 王毛球[1] Peng Mengdu;Shi Jie;Cui Bing;Sun Ting;Li Xiaoyuan;Wang Maoqiu(Institute for Special Steels,Central Iron and Steel Research Institute,Beijing 100081,China;Maanshan Iron &Steel Co.,Ltd.,Maanshan Anhui 243003,China;School of Materials Science and Engineering,Anhui University of Technology,Maanshan Anhui 243000,China)

机构地区：[1]钢铁研究总院特殊钢研究所,北京100081 [2]马鞍山钢铁股份有限公司,安徽马鞍山243003 [3]安徽工业大学材料科学与工程学院,安徽马鞍山243000

出　　处：《金属热处理》2018年第12期37-41,共5页Heat Treatment of Metals

摘　　要：采用光学及透射电镜对高氮奥氏体Fe-20Mn-19Cr-0. 6N钢条件拉伸微观组织及力学性能进行了研究。研究结果表明:固溶态材料的强塑积可以达到57 GPa·%。经过26%变形量冷轧后,屈服强度提高一倍,提升至1110 MPa,而断后伸长率只有18. 5%,强塑积降至24 GPa·%。随着拉伸温度的提高,材料的强度和塑性均呈下降趋势。经过冷轧后,基体中拥有很高的位错密度,在变形过程中,应变硬化速率下降较快,但TWIP效应机制仍会启动并改善塑性。温度的提升使材料的层错能提高,从而抑制TWIP效应的作用,使高温拉伸材料的强度和塑性的提升较固溶态低。The conditioned tensile behavior on microstructure evolution and mechanical properties of Fe-20Mn-19Cr-0.6N high nitrogen austenitic steel were studied by using optical microscopy and transmission electron microscopy.The results show that the strength-elongation product can reach 57GPa·%under solution treatment (ST).The yield strength increases one time and reaches 1110MPa,total elongation is just 18.5%,and the strength-elongation product decreases to 24GPa·%after 26%cold deformation reduction.The strength and plasticity present a downward trend with the increase of tensile temperature.For microstructure,the dislocation density of matrix stands a high level after cold deformation.Meanwhile,the strain hardening rate decreases rapidly,and the twinning induced plasticity (TWIP)effect can still work to improve the plasticity during tensile deformation.The increment of strength and plasticity is lower as ST,due to the temperature increment can increase the stacking fault energy and therefore suppress the TWIP effect.

关 键 词：高氮奥氏体钢 冷轧 高温拉伸 加工硬化速率 TWIP效应 

分 类 号：TG142.11[一般工业技术—材料科学与工程]