碳化物演变对冷轧ART 0.1C-7Mn钢Lüders行为影响  

Effect of carbide evolution on Lüders behavior of cold rolled ART 0.1C-7Mn steel

作　　者：田亚强 毕文强 潘红波[2] 李红斌 郑小平 陈连生 TIAN Ya-qiang;BI Wen-qiang;PAN Hong-bo;LI Hong-bin;ZHENG Xiao-ping;CHEN Lian-sheng(Key Laboratory of the Ministry of Education for Modern Metallurgy Technology,North China University of Science and Technology,Tangshan 063009,Hebei,China;Key Laboratory of Metallurgical Emission Reduction and Resources Recycling of Ministry of Education,Anhui University of Technology,Ma′anshan 243002,Anhui,China)

机构地区：[1]华北理工大学教育部现代冶金技术重点实验室,河北唐山063009 [2]安徽工业大学冶金减排与资源综合利用教育部重点实验室,安徽马鞍山243002

出　　处：《钢铁研究学报》2020年第6期505-511,共7页Journal of Iron and Steel Research

基　　金：国家自然科学基金资助项目(51574107);国家自然科学基金钢铁联合基金资助项目(U1860105);河北省高等学校科学技术研究资助项目(ZD2019064)。

摘　　要：采用SEM、XRD、力学性能测试等实验分析方法对冷轧中锰钢(0.1C-7Mn)在奥氏体逆相变不同温度退火过程中碳化物演变对Lüders应变的影响进行了分析。结果表明:随着退火温度的升高,碳化物先析出后溶解,在640℃退火时碳化物全部溶解,逆转变奥氏体的稳定性适中,强塑积最高为25 GPa·%。退火温度偏低导致奥氏体稳定性过高,同时碳化物会抑制位错运动,使得屈服点延伸较为明显;退火温度适中则高密度位错开始回复,变形时能持续地产生TRIP效应硬化基体,提高材料的综合性能;退火温度偏高时,碳化物的溶解导致位错对消重排,Lüders应变消失,奥氏体稳定性降低,应变诱导马氏体快速形成,导致中锰钢抗拉强度较高但均匀伸长率降低。Through SEM,XRD and tensile test,the carbide evolution of a cold rolled medium-Mn steel(0.1 C-7 Mn)during austenite reverted transformation at different intercritical temperatures,and its effect on Lüders strain were investigated.The results show that the carbides precipitate first and then dissolve completely when annealing at higher temperature than 640℃.Highest PSE of 25 GPa·%is achieved due to the moderate stability of reverted austenite at 640℃.The stability of austenite is high when annealing at lower temperature,and the carbides retard the dislocation motion,which result in the significant yield point elongation.When annealing at moderate temperature,the high density dislocation starts to recover,continuous TRIP effect will harden the matrix during deformation,and enhance the mechanical properties.The dissolution of carbides at high annealing temperature leads to the elimination and rearrangement of dislocation,and the Lüders strain disappears.The stability of austenite decreases,strain induces the formation of martensite rapidly,resulting in higher ultimate tensile strength and lower uniform elongation.

关 键 词：中锰TRIP钢 两相区退火 残余奥氏体 碳化物 Lüders应变 

分 类 号：TG142.1[一般工业技术—材料科学与工程] TG161[金属学及工艺—金属材料]