三种链条钢断裂韧度特性的研究

The Study of Three Kinds of Circular Chain Materials Fracture Toughness Characteristic

采用三点弯曲试样对23MnNiCrMo64、23MnNiCrMo62和20Mn2三种材料的断裂韧性进行了试验．并利用显微组织研究方法和断口特征的观察，分析了六金的组织与助性之间的关系。结果表明．在试样尺寸相同条件下，23MnNiCrMo62钢的韧性最高．23MnNiCrMo64次之，20Mn2最低。其原因除与材料的冶金质量和合金元素含量有关外．还与其热处理工艺有很大的关系。

The fracture toughness of three kinds of materials. 23MnNiCrMo64、23MnNiCrMo62 and 20Mn2. was examined by the method of three point bending respectively. The relation of fracture toughness of materials with its composition and microstructure was analyzed by means of the method of microscopy and fracture morphology. The experiment results show that their fracture toughness ordering is 23MnNiCrMo62＞23MnNiCrMo64＞20Mn2 under the condition of the same of sample size. This relate not only to metallurgicral quality and alloying element contents of the material but also to its heat treatment technique.