奥氏体化温度对含铜高碳马氏体不锈钢的组织和性能的影响  

Effect of Austenitizing Temperature on Microstructure and Properties of High Carbon Cu-bearing Martensitic Stainless Steel

作　　者：郝文俊 敬和民 席通[2] 杨春光[2] 杨柯[2] HAO Wenjun;JING Hemin;XI Tong;YANG Chunguang;YANG Ke(School of Materials Science and Engineering.Anhui University of Technology,Ma Anshan 243000,China;Shi-changxu Innovation Center for Advanced Materials,Institute of Metal Research.Chinese Academy of Sciences,Shenyang 110016,China)

机构地区：[1]安徽工业大学材料科学与工程学院,马鞍山243000 [2]中国科学院金属研究所师昌绪先进材料创新中心,沈阳110016

出　　处：《材料研究学报》2024年第2期121-129,共9页Chinese Journal of Materials Research

基　　金：国家自然科学基金(52101293)。

摘　　要：使用光学显微镜(OM)、扫描电子显微镜(SEM)、X射线衍射(XRD)、电子背散射衍射(EBSD)和透射电子显微镜(TEM)等手段对高碳马氏体不锈钢进行表征,研究了添加铜(Cu)对其在不同奥氏体化温度下组织的变化,并分析了其强韧性和耐蚀性。结果表明:随着奥氏体化温度的升高合金中碳化物的含量降低,残余奥氏体的含量提高。Cu的添加促进了分布在基体上的小尺寸碳化物的析出,且使合金中残余奥氏体的含量显著提高。残余奥氏体的软化作用大于马氏体的强化作用,使含Cu高碳马氏体不锈钢的硬度稍有降低,但是其室温冲击功由8Cr18MoV的1.5 J提高到8Cr18MoV-3.1Cu的9.1 J,其韧性也大幅度提高。同时,残余奥氏体的增加使含Cu钢的自腐蚀电位有所降低。The effect of copper(Cu)addition on the microstructure,mechanical properties and corrosion resistance of high carbon Cu-bearing martensitic stainless steels,being subjected to austenitizing treatment at different temperatures was investigated by means of optical microscopy(OM),scanning electron microscope,(SEM),X-Ray diffraction(XRD),electron back scattered diffraction(EBSD)and transmission electron microscope(TEM).The results show that the fraction of carbides decreases and the content of retained austenite increases gradually with the increase of austenitizing temperature.The addition of Cu has a positive effect on the amount of precipitation for small size carbides,which distributed in the matrix,and increases the retained austenite significantly.The hardness of high carbon Cu-bearing martensitic stainless steel decreases slightly after Cu addition,because the softening effect of retained austenite is greater than the strengthening effect of martensite.Meanwhile,the impact absorption energy increase from 1.5 J to 9.1 J,indicating that the toughness of the steel was enhanced significantly.Besides,the free-corrosion potential of the Cu-bearing stainless steels decreases due to the increase of retained austenite volume fraction.

关 键 词：金属材料 含铜高碳马氏体不锈钢 奥氏体化 硬度 耐蚀性 残余奥氏体 

分 类 号：TG161[金属学及工艺—热处理]