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通过光学显微镜(OM)、扫描电镜(SEM)观察及硬度测试,研究了加热温度和保温时间对轴承钢GCr15Si Mn碳化物回溶的影响。结果表明,随加热温度升高和保温时间延长,碳化物回溶加剧,组织显微硬度升高,且加热温度影响较保温时间更为明显;碳化物形态变化趋势为:层片状(或网状)→杆棒状→球状,部分完全溶入基体,但在实验条件下碳化物不能完全回溶;奥氏体优先在铁素体和渗碳体两相界面处形核,层片状珠光体向奥氏体转变过程极其快速。
The effects of heating temperature and holding time on the remelting of GCr15Si Mn carbides of bearing steel were investigated by optical microscope (OM), scanning electron microscope (SEM) and hardness measurement. The results show that as the heating temperature increases and the holding time prolongs, the carbide dissolution increases, the microhardness of the microstructure increases, and the influence of heating temperature is more obvious than the holding time. The change tendency of carbide morphology is: lamellar Like rod → rod → ball, part of the complete dissolution into the matrix, but under the experimental conditions carbides can not be completely dissolved; austenite preferred ferrite and cementite two-phase interface at the nucleation, lamellar pearlite The transition to austenite is extremely fast.