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斜平面硬度法系采用简便的表面洛氏硬度试验法,通过一个斜率为0.008的斜平面(斜平面长50毫米,深0.4毫米),将每间隔3毫米或6毫米测得的硬度值,与其对应的宽度(换算为深度)绘制成硬度——深度曲线,在曲线上用作图法确定拐点,以判断淬火钢的脱碳情况。试样为圆柱形(图1),材料为42CrMoA。为寻找硬度——深度关系规律,采用不同的淬火加热时间,即盐炉860±10℃,时间分别为1、2、3、4小时15分和1小时15分共五种,
Oblique Plane Hardness Method Using a simple surface Rockwell hardness test method, the hardness values measured at intervals of 3 mm or 6 mm are compared with an inclination of 0.008 on an inclined plane (50 mm in length and 0.4 mm in depth) The corresponding width (in terms of depth) is plotted as a hardness-depth curve, which is used as a plot to determine the inflection point on the curve to determine the decarbonization of the hardened steel. The sample is cylindrical (Figure 1) and the material is 42CrMoA. In order to find the law of hardness-depth relationship, different quenching time is adopted, that is, salt furnace 860 ± 10 ℃, time is 1, 2, 3, 4 hours and 15 minutes and 1 hour and 15 minutes respectively.