局部热处理对SPCC冷轧钢压印接头组织及静力学性能的影响

通过组建局部热处理试验装置,对压印接头进行局部热处理,之后制备金相试样,以观察热处理后压印接头的金相组织,检测热处理前与热处理后接头的组织硬度. 并对热处理前与热处理后的压印试件进行拉伸-剪切试验,对比热处理前与热处理后接头的静强度. 结果表明,局部热处理使压印接头部位材料由铁素体与珠光体组织发生转变出现马氏体组织;与前者相比,马氏体组织具有较高的强度与硬度,马氏体组织的这种特征最终使接头静强度得到大幅提升.

Effect of local heat treatment on microstructure and statics properties of clinched joints for SPCC steel

Local heat treatment was performed on the clinched joints by building an experiment apparatus for local heat treatment. The metallographic specimens were prepared to observe the microstructure of the specimen with heat treatment. The microhardness was measured on the specimens with heat treatment or without. The influence of heat treatment on the static tensile strength of clinched joints was analyzed by comparing two groups of specimen with heat treatment or the one without heat treatment. The results showed that the material of the clinched joints had martensitic structure after heat treatment. The static strength of the clinched joints was promoted largely owing to the martensitic structure compared to the ferrite and pearlite structure of clinched joints had not been treated.