摘要
采用光学显微镜、X射线衍射仪(XRD)、透射电镜(TEM)及能谱分析(EDS)和力学万能试验机等手段,研究了1000~1100℃温度区间淬火和550~750℃温度区间回火对不同Cr含量(13%、15%)的超级马氏体不锈钢的显微组织和力学性能的影响。结果表明,Cr13和Cr15超级马氏体不锈钢经淬火后的显微组织均为板条马氏体和残留奥氏体。Cr13和Cr15两试验钢经淬火+回火后的显微组织为回火马氏体和逆转变奥氏体,形成的逆转变奥氏体与回火马氏体符合K-S关系。回火后发现Cr15钢中存在δ-铁素体。在回火温度范围内,Cr15钢具有较高的硬度、强度和韧性:洛氏硬度为27~37 HRC;抗拉强度为895~1009 MPa;伸长率为17%~21%。
Effect of heat treatments(quenching within the range of 1000-1100℃and tempering within the range of 550-750℃)on the microstructure and properties of supermartensitic stainless steel(SMSS)adding different content of Cr(13 wt%,15 wt%)was evaluated by using optical microscope(OM),X-ray diffraction(XRD),transmission electron microscope(TEM),energy dispersive spectroscopy(EDS)and mechanical universal testing machine.The results indicate that the microstructure of both the Cr13 and the Cr15 tested steels after quenching are lath martensite and retained austenite,and after tempering are tempered martensite and reversed austenite,with the reversed austenite formed conforming to K-S relationship with the tempered martensite.δ-ferrite is also found in the Cr15 steel after tempering.Within the tempering temperature range,Cr15 steel has higher hardness,strength and toughness:27-37 HRC,895-1009 MPa,and 17%-21%,respectively.
作者
姜雯
赵昆渝
苏杰
雍岐龙
Jiang Wen;Zhao Kunyu;Su Jie;Yong Qilong(Kunming University,Kunming Yunnan 650214,China;School of Materials Science and Engineering,Kunming University of Science and Technology,Kunming Yunnan 650093,China;Department of Structural Materials,Central Iron and Steel Research Institute,Beijing 100081,China)
出处
《金属热处理》
CAS
CSCD
北大核心
2019年第10期135-140,共6页
Heat Treatment of Metals
基金
云南省地方高校联合专项(619320090024)
关键词
超级马氏体不锈钢
铬
镍
逆变奥氏体
Δ-铁素体
supermartensitic stainless steel
chromium
nickel
reversed austenite
δ-ferrite
