hardened surface layer 淬硬表面层
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；
In addition, the fatigue life decreases after nitrocarburizing, are because the surface hardened layer leads to the plastic behavior loss of a whole material.
另外，共渗处理疲劳寿命的降低是表面强化层造成整体材料的塑性损失的结果。
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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