The results show that the distribution of macro-hardness presents gradient change, the subsurface layer's hardness is highest, its is 542 HV.
结果表明：渗层到基体的显微硬度呈梯度变化，最高硬度出现在亚表层，硬度为542 HV ；
This failure analysis was performed by using macro check, micrography and hardness measurement.
采用宏观分析、显微检验和硬度测定对压铸模进行了失效分析。
The quality analysis for gas nitrocarburized inner gear ring of heavy truck imported from Austria was taken by means of macro/micro-examination, hardness measuring and running test.
利用宏观分析、显微检验、硬度测试和装车试验等手段，对引进奥地利重型汽车内齿圈按照新的气体氮碳共渗工艺处理后的质量进行了研究。
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