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对GCr 15轴承钢在激光超快速加热淬火条件下的马氏体特征进行了探讨。实验结果表明:在激光超快速加热淬火条件下(加热速度1.8×10~4～2.0×10~5℃/s,冷却速度1.6×10~4～9.8×10~4℃/s),其马氏体为一种在尺寸上细化,在形态上碎化的混合结构。而且,激光淬火马氏体仍由板条马氏体和片状马氏体所组成,其亚结构为位错与孪晶共存。产生这一现象的根源在于奥氏体中碳浓度分布的高度不均匀性和高温奥氏体晶粒的超细化。
The martensitic characteristics of GCr 15 bearing steel under laser rapid heating and quenching conditions were discussed. The experimental results show that under the condition of laser rapid heating and quenching (heating rate of 1.8 × 10 ~ 4 ~ 2.0 × 10 ~ 5 ℃ / s, cooling rate of 1.6 × 10 ~ 4 ~ 9.8 × 10 ~ 4 ℃ / s) The martensite is a hybrid structure that is refined in size and morphologically fragmented. Moreover, the laser-quenched martensite is still composed of lath martensite and lamellar martensite, and its substructure coexists with dislocations and twins. The root cause of this phenomenon is the highly inhomogeneous distribution of carbon concentration in austenite and the ultrafine grain refinement of high-temperature austenite grains.