调质后涂层硬度不变，而基体硬度有较大的提高。

Hardness of the substrate was increased and hardness of the coating was not varied after heat-treatment.

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结果表明：曲轴基体硬度和冷却方式对共渗层表面硬度的提高有着直接的影响。

The result showed that hardness of crankshaft and cooling way had direct influences on enhancement of surface hardness of nitrocarburizing layer.

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通过统计分析，研究了高珠光体含量球铁的基体硬度与球化率和珠光体含量的关系。

By statistical analysis, the relationship between the matrix hardness of the high pearlite-containing nodular iron and its nodularity and pearlite content was investigated.

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