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对普通C-Mn钢,Cr-Mo钢和三种焊缝金属进行了系列温度示波冲击试验,COD试验和屈服强度的测定,通过对试验结果的分析,发现中低强结构钢和焊缝金属的冲击韧性和COD的延脆转变温度之间存在着一定的相关关系,即试验材料的冲击韧性和断裂韧性的延脆转变温度迁移量与材料的应变速率敏感性呈线性关系。根据这一关系,推荐了工程上用冲击韧性推测COD的方法,并指出这一相关关系存在的内在原因是,不同试验材料的缺口冲击试样和裂纹静载试样在延性断裂过程及解理的力学条件这二个方面的相似性。
A series of temperature oscillometric impact test, COD test and yield strength test were carried out on ordinary C-Mn steel, Cr-Mo steel and three kinds of weld metal. By analyzing the test results, it was found that low- There is a certain correlation between the impact toughness of the metal and the ductile brittle transition temperature of COD, namely, the impact toughness of the test material and the ductile-brittle transition temperature migration of the fracture toughness have a linear relationship with the strain rate sensitivity of the material. According to this relationship, the method of estimating COD with impact toughness is recommended and the intrinsic reason for the existence of this correlation is that the notched impact specimens and the cracked static specimens of different test materials have a great influence on ductile fracture process and cleavage The mechanical conditions of these two aspects of similarity.