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根据几年来对PD_1钢轨钢在各种工艺条件下的断裂韧性值的测试,发现由于出现早期“PoP—in”现象而引起K_(IC)值的严重分散性,其实测K_(IC)值偏差达10MN/m~(3/2)左右。因此给对PD_1钢轨钢的断裂韧性值的评价带来一定困难。基于K_(IC)值的统计分布曲线的测定和分析及较多的实测数据验证,认为用同种工艺条件下同一取样方法的同一尺寸试样在相同的测试条件测得的K_(IC)值遵循正态分布。因此提出可采取不考虑“PoP—in”出现与否的差别,对有效的K_(IC)值取其平均值为材料的K_(IC)值,取其标准误差来表示K_(IC)值的波动范围的方法来处理这类材料的断裂韧性值的评价。
According to several years of testing the fracture toughness values of PD_1 rail steel under various process conditions, it was found that the K_ (IC) value deviation was actually measured due to the severe dispersion of K_ (IC) value caused by the early “PoP-in” phenomenon Up to 10MN / m ~ (3/2) or so. Therefore, the evaluation of the fracture toughness of PD_1 rail steel brings some difficulties. Based on the measurement and analysis of the statistical distribution curve of K_ (IC) value and the verification of more measured data, it is considered that the K_ (IC) value of the same size sample of the same sampling method under the same process conditions under the same test conditions Follow the normal distribution. Therefore, it is proposed to take the difference whether or not “PoP-in” appears or not, and take the average value of the effective K_ (IC) value as the material’s K_ (IC) value and take the standard error as the value of K_ (IC) Fluctuation of the method to deal with the evaluation of the fracture toughness value of such materials.