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为什么研究断口什么叫做断口?断口是金属材料断裂后,破坏部分的外观形貌的通称。在冶金工业上,研究断口的主要目的有二:第一,分析钢材内部结构的特征,合理地制订钢材断口标准;第二,研究钢材断裂机构,正确地分析钢材质量事故。如果说钢材断口检验属于“防患未然”,即避免有缺陷的钢材制成金属结构件的话,分析钢材质量事故就属于“吸取教训”。冶金工业部制订的合金结构钢(YB6-71)、弹簧钢(YB8-59)
Why study the fracture What is called the fracture? Fracture is the common name of the appearance of the destruction of the metal surface after fracture. In the metallurgy industry, the main purpose of the study of fracture is twofold: first, analysis of the characteristics of the internal structure of steel, rational development of steel fracture standards; second, the study of steel fracture mechanism, the correct analysis of steel quality accidents. If the steel fracture inspection belongs to the “preventive measures”, that is, to avoid defective steel made of metal structures, the analysis of steel quality accidents are “lessons learned.” Metallurgical Industry formulated the alloy structural steel (YB6-71), spring steel (YB8-59)