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.
出处
《热加工工艺》
CSCD
北大核心
2009年第20期5-7,10,共4页
Hot Working Technology
基金
国家自然科学基金重点资助项目(50634030)
