CAJ | 학술논문

统计了国内四家钢轨生产企业近几年生产的60kg/m U71M n和 U75V钢轨的室温冲击功。U 71 M n钢轨轨头、轨腰和轨底的冲击功平均值分别为15．65 J、8．69 J和19．57 J ，U 75 V钢轨轨头、轨腰和轨底的冲击功平均值分别为14 J、9．03 J和16．28 J。轨底冲击功最高，轨头次之，轨腰最低。各钢厂生产的U71M n和U75V 冲击功的均值和波动范围相似。 U71M n钢轨轨头和轨底的冲击功高于U75V钢轨，轨腰的冲击功与 U75V 钢轨基本相同。 U71M n和U75V钢轨全断面各部位的冲击功的变化规律相似，越靠近钢轨边部，压缩比越大，冷却速度更快，冲击功越高；而轨腰部位受铸坯中心区域的偏析、疏松等缺陷的影响越小，冲击功最小。
통계료국내사가강궤생산기업근궤년생산적60kg/m U71M n화 U75V강궤적실온충격공。U 71 M n강궤궤두、궤요화궤저적충격공평균치분별위15．65 J、8．69 J화19．57 J ，U 75 V강궤궤두、궤요화궤저적충격공평균치분별위14 J、9．03 J화16．28 J。궤저충격공최고，궤두차지，궤요최저。각강엄생산적U71M n화U75V 충격공적균치화파동범위상사。 U71M n강궤궤두화궤저적충격공고우U75V강궤，궤요적충격공여 U75V 강궤기본상동。 U71M n화U75V강궤전단면각부위적충격공적변화규률상사，월고근강궤변부，압축비월대，냉각속도경쾌，충격공월고；이궤요부위수주배중심구역적편석、소송등결함적영향월소，충격공최소。
T he impact energy at room temperature of 60kg/m U71M n and U75V rails produced by four domestic rail enterprises in recent years were counted in this paper .The impact energy of U71Mn rail head ,rail waist and rail bottom stood at 15 .65 J、8 .69J and 19 .57J respectively on average .The impact en-ergy of U75V rail head ,rail waist and rail bottom stood at 14 J、9 .03J and 16 .28J respectively on average . The impact energy of rail bottom was highest ,followed by the rail head ,and that of rail waist was the lowest .The equalizing value and fluctuation of impact energy of U71Mn and U75V produced in the domes-tic steelworks was similar .The impact energy of U71Mn rail head and rail bottom were higher than that of U75V rail ,and the impact energy of rail waist was basically equal .The impact energy of various parts of the whole section of U71Mn and U75V rail showed similar patterns .The closer it is to the rail edge ,the greater compression ratio and cooling velocity and the higher the impact energy .But the impact energy in rail waist was minimal because of the influence by the defect in the billet center regional such as the segre-gation ,porosity and so on .