作　　者： ; ; ; ;

机构地区： 东北大学材料与冶金学院轧制技术及连轧自动化国家重点实验室

出　　处： 《热加工工艺》 2009年第20期5-7,10,共4页

摘　　要： 利用光学显微镜、扫描电镜(SEM)、维氏硬度计以及thermo-calc和photoshop软件对经不同温度奥氏体化、淬火后的GCr15轴承钢试样的显微组织进行了分析研究。结果表明:720～750℃奥氏体化时,碳原子进行短程扩散,几乎无奥氏体生成;755℃为奥氏体化的转折点,碳原子进行长程扩散,奥氏体出现;奥氏体化温度为780℃时,不但珠光体中的渗碳体全部粒化,先共析渗碳体也溶解碎断,剩余渗碳体以细小弥散的颗粒状分布在奥氏体基体中。 The microstructure of GCr15 beating steel samples austenitized and quenched at different temperature was studied with optical microscopy, SEM, Vickers hardness tester and software of thermo-calc and photoshop. The results show that carbon atoms diffuse in short distance and no austenite occurs when the testing steel is austenitized at 720-750℃; they diffuse in long distance and austenite occurs at 755℃ which is the turning point of austenitizing temperature. When the testing steel is austenitized at 780 ℃, not only all the cementite in pearlite is granulated, but also the pro-eutectoid cementite is dissolved and broken, and the residual cementite particles are small and dispersed in austenite matrix.

关 键 词： 钢 渗碳体 奥氏体化 扩散

领　　域： [金属学及工艺] [一般工业技术] [金属学及工艺]