本文以渗碳热处理后的M50NiL钢为研究对象,利用Vickers硬度计,XRD,TEM,HRTEM以及旋转弯曲疲劳试验仪对普通磨削和精密磨削后试样表面变质层微观结构和硬度及试样的疲劳性能进行了研究.结果表明:进刀量不同的2种磨削工艺获得的试样表面粗糙度不同,表面变质层微观结构和硬度以及试样疲劳性能差别较大.精密磨削对试样硬度产生影响的深度较小.普通磨削表面变质层奥氏体含量较多,呈现明显的奥氏体.有效晶粒”现象；精密磨削表面变质层则为非常细小的变形马氏体组织,呈现明显的纳米级马氏体.有效晶粒”现象；“有效晶粒”之间无明显的界面,且晶面扭转现象明显,相邻“有效晶粒”之间转动角度最大可达14°,同时“有效晶粒”内部晶面也存在轻微扭转现象；精密磨削工艺试样的旋转弯曲疲劳寿命约为普通磨削的13倍.
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