高硼奥氏体钢的高温力学性能  

High Temperature Mechanical Properties of High-Boron Austenitic Steels

作　　者：陈祥[1,2] 李言祥[1,2] 刘源[1,2] 张华伟[1,2] CHEN Xiang;LI Yanxiang;LIU Yuan;ZHANG Huawei(School of Materials Science and Engineering,Tsinghua University,Beijing 100084,China;Key Laboratory for Advanced Materials Processing Technology,Ministry of Education of China,Beijing 100084,China)

机构地区：[1]清华大学材料学院,北京100084 [2]先进成形制造教育部重点实验室,北京100084

出　　处：《铸造技术》2020年第7期597-601,共5页Foundry Technology

摘　　要：采用热力学模拟实验机研究了高硼奥氏体钢在850℃下的高温力学性能,采用光学体视显微镜和SEM研究了材料的组织状态。分析了B和C含量变化对材料室温及高温力学性能的影响。结果表明,添加B后,B在实验钢基体内以M2B(M为Fe,Cr或Mn)型硼化物的形式分布在奥氏体基体上,有效提高了材料的高温力学性能,材料硬度由200 HV提高到302 HV,850℃拉伸屈服强度由144 MPa提高到190 MPa,压缩屈服强度由140 MPa提高到168 MPa;而C含量提高时,高硼奥氏体钢基体内硼化物形态得到了圆整化、分布趋于粒状离散化,材料硬度由239 HV提高至312 HV,850℃拉伸屈服强度由165 MPa提高到197 MPa,压缩屈服强度由166 MPa提高到184 MPa。高硼奥氏体钢的高温力学性能优于用于对比的经电渣重熔的ESR-H13钢。The high-temperature mechanical properties of high-boron austenite steels(HBASs)were studied at 850 C using a dynamic thermal-mechanical simulation testing machine.The microstructure of the material was studied by optical stereoscopic microscope and SEM.The effects of B and C contents on the mechanical properties at room temperature and high temperature of the HBASs were analyzed.The results show that after adding B,B is distributed on the austenitic matrix in the form of M2 B(M as Fe,Cr or Mn)borides in the experimental steel matrix,which effectively improved the mechanical properties of the material at high temperature.The hardness of the material increaseds from 200 HV to 302 HV,the tensile yield strength at 850℃increaseds from 144 MPa to 190 MPa,and the compressive yield strength increased from 140 MPa to 168 MPa.When the content of C increaseds,the borides in the matrix of high-boron austenitic steel are rounded and dispersed in granular manner.While the hardness of the material increase from 239 HV to 312 HV,the tensile yield strength at 850℃increaseds from 165 MPa to 197 MPa,and the compressive yield strength increaseds from 166 MPa to 184 MPa.The high boron austenitic steel has better mechanical properties at high temperature than ESR-H13 steel which is remelted by electroslag for comparison.

关 键 词：奥氏体 硼化物 高硼奥氏体钢 高温力学性能 

分 类 号：TG142[一般工业技术—材料科学与工程]