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。
The safe Angle of nitrogen alloyed austenitic stainless steel is better than high tempered middle carbon steel of HRC33.7 and HRC30.1 in hardness.
含氮奥氏体不锈钢的安全角优于硬度为HRC33.7和HRC30.1的高温回火中碳钢，前者具有较高的抗弹丸倾斜入射的能力。
Having studied the relationship between tempered hardness and tempering temperature for hardened carbon steels, a tempering behaviour model is set up between hardness and temperature.
研究了淬硬钢回火硬度与回火温度的关系，建立了回火硬度与回火温度关系的回火效应模型。
Bainite has higher abrasive wear resistance than tempered martensite with equal or higher hardness in hard abrasion, but in reverse in soft abrasion.
下贝氏体组织在高应力磨料磨损下比相同硬度，或稍高硬度的回火马氏体组织具有较高的耐磨性，但在低应力磨损下表现为不利的作用。
The results showed that the hardness of tempered P20 steel higher, the roughness lower and the polishing performance better;
结果表明，P2 0钢回火后的硬度越高，粗糙度越低，抛光性能越好；
The sintered-tempered compact has high hardness without performing the quenching process.
所述烧结且回火的坯体在没有任何淬火处理的情况下具有高硬度。
The sintered-tempered compact has high hardness without performing the quenching process.
所述烧结且回火的坯体在没有任何淬火处理的情况下具有高硬度。
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