一种新型多尺度碳氮化物强化马氏体耐热钢的研制  

Development of Newly Multi-sized Carbonitrides Strengthened Martensitic Heat Resistant Steel

作　　者：张文凤 刘运强 刘晓刚 叶东 邹爱成 严伟[2] ZHANG Wenfeng;LIU Yunqiang;LIU Xiaogang;YE Dong;ZOU Aicheng;YAN Wei(Guangxi Colleges and Universities Key Laboratory of Robot&Welding,Guilin University of Aerospace Technology,Guilin 541004,China;Institute of metal research,CAS,Shenyang 110016,China)

机构地区：[1]桂林航天工业学院广西高校机器人与焊接技术重点实验室,广西桂林5410004 [2]中国科学院金属研究所,辽宁沈阳110016

出　　处：《热加工工艺》2019年第24期42-45,共4页Hot Working Technology

基　　金：国家青年基金项目(51601044);广西自然科学基金项目(2015GXNSFBA139225,2016GXNSFBA380230);校级自然科学基金项目(YJ1405);广西高校机器人与焊接技术重点实验室开放课题项目(JQR2017ZR06).

摘　　要：为了强化马氏体耐热钢,采用控制热变形程中的温度、速率、弛豫时间及热处理工艺的方法制备了多尺度碳氮化物。研究了工艺参数和热处理工艺对多尺度碳氮化物析出相的影响。结果表明,碳氮化物析出相尺度主要分布在50 nm以下和100~200 nm,其中尺寸在50 nm以下的析出相可强化基体和阻碍位错运动;而尺寸在100~200 nm的碳氮化物析出相可促进亚晶界的形成以及马氏体板条界和原奥氏体晶界的稳定。经过处理的马氏体耐热钢在蠕变或时效过程中组织的高温稳定性增强,可延长材料在高温长时条件下的服役寿命。In order to strengthen the martensitic heat resistant steels,the multi-sized carbonitrides were prepared by controlling temperature,rate and stress relaxation time in the hot deformation process and the heat treatment procedure.The results show that the multi-size of the carbonitrides precipitated phase are mainly in 0-50 nm and 100-200 nm.The small sized precipitates(below 50 nm)can strengthen the matrix and cumber the movement of dislocations.The 100-200 nm particles mainly contribute to the formation of sub-grain boundaries and the stability of the martensite lath boundaries and the prior austenite boundaries.The high temperature stability of the microstructure of the treated martensitic heat resistant steels enhances during creep and aging,which can improve the serivice life of the materials at high temperature and long time.

关 键 词：形变诱导析出 热处理 碳氮化物强化 高温蠕变 马氏体耐热钢 

分 类 号：TG142.73[一般工业技术—材料科学与工程]