异步热轧高锰无磁钢的组织与力学性能  

Microstructure and mechanical property of asymmetrically hot-rolled high manganese non-magnetic steel

作　　者：李长生[1] 马彪[1] 宋艳磊 王纪开 

机构地区：[1]东北大学轧制技术及连轧自动化国家重点实验室,沈阳110819

出　　处：《中国科技论文》2016年第10期1081-1084,共4页China Sciencepaper

基　　金：高等学校博士学科点专项科研基金资助项目(20130042110040);国家自然科学基金资助项目(51274062);国家高技术研究发展计划(863计划)资助项目(2012AA03A503)

摘　　要：为了细化奥氏体晶粒组织,提高30Mn20Al4V高锰无磁钢的力学性能,提出了异步热轧工艺方法,研究了单道次异步热轧过程中异速比、轧制温度、压下量等工艺参数对于高锰无磁钢热轧组织和力学性能的影响。结果表明:异步轧制的剪应变作用使得钢板表面晶粒细化,细晶尺寸约为8μm;随着异速比的增大,钢板表面细晶层的厚度增加,同时心部变形奥氏体由于受到剪应力的作用而使硬度值增大,再结晶比例提高。异步热轧后实验钢的屈服强度和抗拉强度随异速比的增大而增大,伸长率略有下降。随着异步热轧温度的降低或压下量的减小,高锰无磁钢发生再结晶受到明显抑制。In order to refine the austenitic grain size and improve the mechanical properties for 30Mn20Al4non-magnetic steel,the application of asymmetrical hot rolling process was proposed,and the effects of velocity ratio,temperature and reduction on their hot-rolled microstructure evolution and mechanical property were also investigated during the single-pass asymmetrical hot rolling.The results show that with an enhanced velocity ratio,the thickness of surface fine-grained layer is increased and the average size of these recrystallised grains is about 8μm.Due to the strong shear strain on the surface of steel plate,the microhardness of deformed austenite in the center is improved and the recrystallisation fraction is also raised.Besides,both the yield and the tensile strength of experimental steels subjected to an asymmetrical hot rolling increase with an enhanced velocity ratio,but the elongation is slightly declined.In addition,as the rolling temperature is lowered or the reduction decreases,the recrystallisation process can be apparently inhibited.

关 键 词：异步热轧 高锰无磁钢 奥氏体 力学性能 

分 类 号：TG142.1[一般工业技术—材料科学与工程]