回火温度对高Cr马氏体耐热钢组织与性能的影响  

Effect of Tempering Temperature on Microstructure and Mechanical Properties of High Cr Martensitic Heat Resistant Steel

作　　者：崔辰硕 高秀华[1] 苏冠侨 权秀 CUI Chen-shuo;GAO Xiu-hua;SU Guan-qiao;QUAN Xiu(State Key Laboratory of Rolling and Automation,Northeastern University,Shenyang 110819,China;Jiangsu Huaian Zhenda Steel Enterprise Co.,L td.,Huaian 223001,China)

机构地区：[1]东北大学轧制技术及连轧自动化国家重点试验室,辽宁沈阳110819 [2]江苏淮安振达钢管企业有限公司,江苏淮安223001

出　　处：《东北大学学报（自然科学版）》2018年第4期501-505,共5页Journal of Northeastern University(Natural Science)

基　　金：国家高技术研究发展计划项目(2015AA03A501)

摘　　要：利用光学显微镜(OM)、透射电镜(TEM)、扫描电镜(SEM)及电子探针(EPMA)等手段,系统研究了不同回火温度下9%Cr马氏体耐热钢的组织及力学性能变化.结果表明:回火后位错网络化、析出相形态、板条马氏体破碎化等是影响力学性能变化的主要因素.正火并760℃回火后在室温和550℃条件下抗拉强度分别达到657和556 MPa,0℃冲击功达到285 J,此回火温度下实验钢具有最佳综合力学性能.700,820,850℃回火,韧性大幅降低.高温服役条件下不发生粗化的M X相弥散分布在铁素体和马氏体中,与马氏体高温回复形成的亚稳态多边形结构有效提升耐热钢抗高温蠕变性能.The microstructure and mechanical properties of 9%chromium martensitic heat resistant steel tempered at different temperature were investigated w ith the OM,TEM,SEM and EPM A.The results showed that the dislocation netw ork,precipitation phase and lath martensite fragmentation after tempering were the main factors for the variations of mechanical properties.It was found that after normalizing and tempering at 760℃,the test steel had an excellent integrated mechanical properties,where the tensile strength at room temperature and 550℃reached 657 MPa and 556 M Pa,respectively,and the impact absorbing energy at 0℃reached 285 J.Tempering at 7 0 0,820 and 850℃,promoted a substantial reduction in toughness.Under a high temperature service,the M X phase was dispersed uniform ly in the ferrite and martensite without coarsening,and metastable polygonal structure was formed during the recovery of martensite at high temperature.Such combination of substructure and dispersed distribution can effectively enhance the high-temperature creep resistance of this heat-resistant steel.

关 键 词：回火温度 马氏体 析出 位错网络 耐热钢 

分 类 号：TG335.3[金属学及工艺—金属压力加工]