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在进行洛氏及表面洛氏硬度试验时,正确地选择试件或试验层的厚度是获得可靠的试验数据的重要环节。试件或试验层的最小厚度至少应为压痕永久深度(以下简称压痕深度)的10倍(或8倍)。现把洛氏及表面洛氏硬度与压痕深度对照表(对照表的编造是应用最小二乘法原理对文献1中的数据进行拟合而成的)介绍如下: 一、洛氏硬度与压痕深度对照表大家知道,洛氏硬度试验的压痕深度应为预负荷压痕深度与主负荷压痕深度之和。根据洛氏硬度试验原理其计算公式为: 当用C、A、D标尺(金刚石圆锥体压头)试验时:
In the Rockwell and Rockwell surface hardness tests, the correct choice of the thickness of the test specimen or test layer is an important part of obtaining reliable test data. The minimum thickness of the test piece or test layer shall be at least 10 times (or 8 times) the indentation permanent depth (hereinafter indentation depth). Is now Rockwell and surface Rockwell hardness and indentation depth table (control table is made by applying the principle of least squares method to fit the data in the literature 1) are as follows: A Rockwell hardness and indentation The depth of the table we all know, Rockwell hardness test indentation depth should be the depth of pre-indentation and the main load indentation depth. According to Rockwell hardness test principle calculation formula: When using C, A, D scale (diamond cone pressure head) test: