Indentation methods of hardness testing comprise two principal groups.

压痕法测定硬度包括两大类.

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The surface layers are characterized by means of optical microscope, TEM, SEM and micro - hardness testing machine.

用光镜、扫描电镜 、 透射电镜和硬度计等手段分析并研究其表层变形层金相组织 、 晶粒尺寸及显微硬度.

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Hardness testing the depth and the trapezium of the carbonized layers and quench hardened layers.

炭化层和淬火硬化层的深度及梯度的硬度测试.

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The company also owns more than precision of the machine, hardness testing machine.

公司还拥有多台精密分条机 、 硬度测试机.

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