The evaluation of measuring uncertainty in metallic material Brinell hardness test is studied by testing the hardness of the 45 quenched and tempered steel.
以45#调质钢硬度试验为例，研究了金属材料布氏硬度试验中测量不确定度的评定。
Tempered martensite was gradually generated as the cutting temperature increased, which is the main cause of the decrease in the hardness.
随着加工温度升高，工件表面逐渐产生回火马氏体，这是造成工件表面硬度下降的主要原因。
The results indicated that the tempered sorbite was the optimum microstructure, the inhomogeneous distribution of micro hardness affected markedly the finish quality of the steel surface.
结果表明：回火索氏体是最佳的组织形态；微观硬度的不均匀性显著影响钢的表面加工质量。
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