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当小零件、小试样的布氏硬度压痕直径用读数显微镜无法测量或在无读数显微镜的情况下,用金相显微镜来代替读数显微镜测量布氏硬度压痕直径,试验结果是可行的,但需注意以下几点:(1) 布氏硬度值在HB150～220之间,用金相显微镜测量的布氏硬度值和用读数显微镜测量的布氏硬度值最大误差为4%;(2) 用金相显微镜测量布氏硬度压痕直径,必须用钢
When small parts, a small sample of Brinell indentation diameter can not be measured with a reading microscope or in the case of no reading microscope, the microscope instead of using a microscope to measure the Brinell hardness indentation diameter test results are feasible, However, the following points should be noted: (1) The maximum Brinell hardness value is between HB150 and 220, the Brinell hardness value measured with a metallographic microscope and the Brinell hardness value measured with a reading microscope are 4%; (2) Measuring the Brinell hardness indentation diameter with a metallographic microscope must be made of steel