The experimental results show that the surface hardened layer consists of non-full transformation area which is adjacent to the base metal and surface full transformation area.

实验结果表明，合金铸铁光束表面相变硬化层由与基材相邻的不完全相变区及表面完全相变区组成。

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The depths and its uniformity of the surface hardened layer, its microhardness and wear resistance are further improved under two-passes grinding.

双程磨削淬硬可使表面硬化层深度及其均匀性、显微硬度及耐磨性得到进一步提高；

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Compared with the dry-grinding, the surface compress residual stresses of the hardened layer under wet-grinding is increased, but its depth of hardened layer reduces about 30%.

与干磨相比，湿磨硬化层表面残余压应力有所提高，但其硬化层深度减少了约30%。

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