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Effect of heat treatment on the microstructure and mechanical properties of structural steel-mild steel composite plates fabricated by explosion welding
International Journal of Minerals, Metallurgy and Materials ( IF 4.8 ) Pub Date : 2020-08-15 , DOI: 10.1007/s12613-020-1986-3
En-ming Zhang , Yi-ming Zhao , Zhong-mou Wang , Wen-ya Li

Two dissimilar steel plates, structural steel and mild steel, were joined by explosion welding to form a composite. The composite was then heat-treated by quenching at 840°C for 30 min followed by tempering at 200°C for 3 h. The microstructure was investigated under an optical microscope and a scanning electron microscope. The mechanical properties were measured using Vickers microhardness and Charpy impact tests. The results show a deformed interface with typical wave features at the welding zone, but no defects were observed. Moreover, the ferrite in the parent plate in the weld zone was elongated due to the strong plastic deformation from the explosion. After heat treatment, the hardness of the flyer plate (structural steel) was over HV0.2 800, while that of the parent plate (mild steel) was HV0.2 200. The increase in hardness was due to the presence of martensite. Moreover, the average impact energy was increased from 18.5 to 44.0 J following heat treatment; this is because of the formation of recrystallized grains at the weld interface, which is due to the dynamic recovery and local recrystallization, and the strong elemental diffusion that occurred between the two plates.



中文翻译:

热处理对爆炸焊接结构钢-钢-钢复合板组织和力学性能的影响

通过爆炸焊接将两种不同的钢板(结构钢和低碳钢)连接起来,形成复合材料。然后通过在840℃下淬火30分钟对该复合材料进行热处理,然后在200℃下回火3小时。在光学显微镜和扫描电子显微镜下研究了微观结构。使用维氏显微硬度和夏比冲击试验测量机械性能。结果表明,在焊接区具有典型波特征的变形界面,但未观察到缺陷。此外,由于爆炸引起的强烈塑性变形,焊接区母板上的铁素体被拉长。热处理后,翼板(结构钢)的硬度超过HV 0.2 800,而母板(低碳钢)的硬度为HV0.2 200.硬度增加是由于马氏体的存在。此外,热处理后的平均冲击能从18.5 J增加到44.0J。这是由于在焊接界面处形成了再结晶晶粒,这是由于动态恢复和局部再结晶以及在两块板之间发生的强元素扩散所致。

更新日期:2020-08-15
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