应变速率对高氮奥氏体钢拉伸变形的影响  

Effect of strain rate on 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》2019年第1期57-60,共4页Heat Treatment of Metals

摘　　要：采用金相及透射电子显微镜对高氮奥氏体Fe-20Mn-19Cr-0. 6N钢在应变速率范围为3×10^(-6)～1 s^(-1)条件下的拉伸变形行为进行了研究。研究结果表明:N元素的固溶强化作用和促使位错平面滑移阻碍位错运动机制是高氮奥氏体钢的重要应变硬化机制,同时,随着应变速率的提升,这种强化机制不断提升,而应变诱导孪生机制不断削弱。随着应变速率的提升,高氮奥氏体钢的抗拉强度和屈服强度均呈逐步上升的趋势,断后伸长率则逐步下降。屈服强度提升超过60%,而抗拉强度提升仅10%。随着应变速率的提升,基体变形程度逐步下降,材料的位错密度和滑移带密度逐步下降。The tensile deformation behavior at strain rate range of 3 × 10^-6-1 s^-1 in Fe-20Mn-19Cr-0. 6N austenitic steel was studied by using optical microscopy and transmission electron microscopy. The results show that the effects of solid solution strengthening and promoting dislocation planar slip to impede dislocation movement by N elements are the important strain hardening mechanism of high nitrogen austenitic steels. Meanwhile,this strengthening mechanism is continuously improved,and the strain induced twin mechanism is gradually weakened with the increase of strain rate. The strength gradually increases and total elongation gradually decreases with the increase of strain rate. The yield strength increases over 60%,while tensile strength increases only by 10%. The deformation degree of the matrix gradually decreases as well as the dislocation density and slip band density with the increase of strain rate.

关 键 词：高氮奥氏体钢 应变速率 应变硬化速率 应变硬化机制 TWIP效应 

分 类 号：TG142.11[一般工业技术—材料科学与工程]