喷吹工艺对GCr15轴承钢K_(1c)和ΔK_(th)的影响及裂纹尺寸的估算

The effect and estimation of crack size of SL technology on K_(1c) and ΔK_(th) of bearing steel GCr15

对SL(钢包喷吹Ca-Si粉 )工艺和CAB(钢包吹氩 )工艺轴承钢GCr15的K1c和ΔKth进行了测定 ,并对裂纹失稳扩展的临界尺寸和亚稳扩展的起始尺寸进行了估算。结果表明 :采用SL工艺的GCr15钢K1c和ΔKth均有所提高 ;裂纹失稳扩展和临界尺寸和亚稳扩展的起始尺寸是CAB工艺的 2倍。

The K 1c and ΔK th of bearing steel GCr15 by SL and CAB processing were measured.The critical dimension of crack quick propagating and the initial dimension of crack sub-propagating were estimated.The results show that the K 1c and ΔK th of steel GCr15 can be improved by SL technology.The critical dimension of cracks quick propagating and the initial dimension of cracks sub-propagating of SL technology are double times than CAB technology.