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一、前言在PD_1钢轨断裂韧性测试中,发现约50％试样出现pop-in现象,同时在所试验过的几种试样尺寸(29×58×250、26×36×180、25×30×150、20×24×110、14×28×125mm)出现几率几乎相同,出现pop-in的试样的K_(IC)值(对应P_(pop-1a))比正常K_(IC)值约低10MN/m~(2~3)。为了评价轨钢的断裂韧性,对出现pop-in现象的原因进行了初步探讨。二、试验概况试验用钢均取自于正常生产工艺条件下,即轧后缓冷十一次矫直的成品轨轨头
I. Preface In the PD_1 rail fracture toughness test, about 50% of the samples were found pop-in phenomenon, at the same time in the sample size of several tests (29 × 58 × 250,26 × 36 × 180,25 × 30 × 150, 20 × 24 × 110, 14 × 28 × 125 mm), the K_ (IC) value (corresponding to pop_la) of the pop-in sample is about the same as the normal K_ (IC) Low 10MN / m ~ (2 ~ 3). In order to evaluate the fracture toughness of rail steel, the cause of pop-in phenomenon was preliminarily discussed. Second, the test profile The test steel are taken from the normal production process conditions, that is, slow cooling after rolling 11 times the finished rail head