摘要
对不同始轧温度热轧后的高碳高铬马氏体不锈钢M390在650℃、750℃和850℃下进行退火热处理,通过热膨胀仪、维氏硬度计、X射线衍射仪及扫描电子显微镜(SEM)等研究了M390在热轧加工过程中不同始轧温度及轧后不同退火温度下的组织及力学性能的变化规律。结果表明:随着热轧后退火温度的提高,M390呈现出强度下降但塑性提高的趋势,同时碳化物尺寸随温度提高进一步变大但数量减少。在温度相对较高即1200℃始轧后,再经过高温850℃退火后的M390,其铁素体基体上均匀分布着细小的球状碳化物。该M390的抗拉强度和断后延伸率分别为920 MPa、0.83%,表现出最佳的综合力学性能,这有利于材料后续的加工和热处理。
Hot-rolled M390 high-carbon and high-chromium martensitic stainless steel was annealed at 650℃,750℃and 850℃.Therefore,the changes of microstructure and mechanical properties of M390 under different initial rolling temperatures and different annealing temperatures after hot rolling were studied by thermal expansion machine,Vickers hardness tester,X-ray diffractometer and scanning electron microscope(SEM).The results show that the strength of M390 deteriorates but the plasticity increases significantly with the increase of annealing temperature after hot rolling,while the carbide size becomes larger and the number of carbides decreases.After initial rolling at a high temperature of 1200℃and then annealing at a high temperature of 850℃,M390’s ferrite matrix uniformly distributed with fine spherical carbide.At this time,the best comprehensive mechanical properties with tensile strength of 920 MPa and elongation of 0.83%are obtained,which was facilitates to the subsequent processing and heat treatment of the material.
作者
王铁军
杨博
梁晨
车洪艳
秦巍
曹睿
WANG Tiejun;YANG Bo;LIANG Chen;CHE Hongyan;QIN Wei;CAO Rui(Advanced Technology&Materials Co.,Ltd.,China Iron&Steel Research Institute Group,Beijing 100081,China;Engineering and Technology Research Center of Hot Isostatic Pressing,Zhuozhou 072750,China;State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metal,Lanzhou University of Technology,Lanzhou 730050,China)
出处
《材料导报》
EI
CAS
CSCD
北大核心
2020年第12期12122-12126,共5页
Materials Reports
基金
国家自然科学基金(51675255,51761027)。
关键词
高碳不锈钢
热轧态
退火温度
组织及力学性能
high-carbon stainless steel
hot-rolled state
annealing temperature
microstructure and mechanical properties
