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应用连续输出的千瓦级CO_2激光器对GCr15轴承钢推力片接触疲劳试样进行了表面相变硬化处理,激光束功率=700瓦,扫描速度=7毫米每秒,离焦量=325毫米,在最大接触应力σ_(max)=4410MPa下,使接触疲劳寿命L_(10)提高2.2倍,L_(50)提高1.6倍。用电镜和X射线方法研究了激光淬火层组织、马氏体碳含量、残余奥氏体量和残余应力等。结果表明,激光淬火的自回火使片状马氏体内析出了弥散细小的η-Fe_2C,马氏体碳含量增加很少,残余奥氏体增加了1.2％,淬火层深～0.40毫米内为残余压应力,在0.01～0.10毫米区域内,应力值稳定在-225MPa左右。
The continuous phase output of the kilowatt CO_2 laser GCr15 bearing steel thrust sheet contact fatigue specimens were subjected to phase transformation hardening, laser beam power = 700 watts, scanning speed = 7 mm per second, the amount of defocus = 325 mm, at maximum The contact stress σ max (max) = 4410MPa, the contact fatigue life L_ (10) increased 2.2 times, L_ (50) increased 1.6 times. The microstructure, martensitic carbon content, residual austenite content and residual stress of laser quenched layer were studied by electron microscope and X-ray. The results show that the self-tempering of laser quenching makes the sheet-shaped martensite precipitated finely dispersed η-Fe 2 C, the martensitic carbon content increased little, the retained austenite increased by 1.2%, and the quenched layer was 0.40 mm deep Residual compressive stress, in the region of 0.01 ~ 0.10 mm, the stress is stable at -225 MPa or so.