第一部分断裂韧性渗碳钢大多是根据其心部和表面渗碳层的淬透性来选择的。以前用却贝或埃佐试验来评定抗断裂性,而这些都不是好的测试方法。通常用提高含镍量和残余奥氏体含量来改善这方面的性能,但从下述可以看出,两者都不能改善抗断裂性。某些标准和非标准渗碳钢的却贝冲击韧性、淬透性和热处理特性较早曾有叙述。从此以后,改善抗 The first part of the fracture toughness carburizing steels are mostly selected according to the hardenability of the carburized layer of their core and surface. Scab resistance was previously evaluated using the Charpy or Ezo test, which are not good test methods. These properties are usually improved by increasing the nickel content and retained austenite content, but as can be seen below, neither can improve fracture resistance. Charpy impact toughness, hardenability and heat treatment characteristics of some standard and non-standard carburized steels have been described earlier. Since then, improve the resistance