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Microstructures and mechanical properties of stainless steel clad plate joint with diverse filler metals
Journal of Materials Research and Technology ( IF 6.4 ) Pub Date : 2020-01-06 , DOI: 10.1016/j.jmrt.2019.12.083
Chang’an Li , Guoliang Qin , Yuansheng Tang , Binggang Zhang , Sanbao Lin , Peihao Geng

Thick stainless steel clad plate is used widely in the petroleum and petrochemical industries because of its low cost and good corrosion resistance. It is generally welded by the multilayer and multipass welding process with stainless steel filler metal matched with the clad layer. In this research, the base metal of stainless steel clad plates was filled with carbon steel filler metal, and the microstructures and mechanical properties of joints with diverse filler metals were analysed and compared. The results indicate that a local hardening zone (LHZ) forms in the weld filled with the filler metals of stainless steel and carbon steel because of the formation of martensite phase in the first layer of weld with filler metal of carbon steel. The microhardness value in LHZ reaches up to 425 HV1, which is significantly higher than that of the base metal. However, the tensile strength value of joints filled with carbon steel filler metal is equivalent to that of the joints with stainless steel filler metal. The results of the side bending test indicate that the LHZ protrudes from the weld, and the crack occurs near the LHZ if the area of the LHZ on the cross section of joint is larger than 17 % of that of the whole cross section of the joint. The studied results show that it is feasible to use carbon steel filler metal to fill the base metal of carbon steel in welding of stainless steel clad plate.



中文翻译:

不同填充金属的不锈钢复合板接头的组织和力学性能

厚的不锈钢复合板由于其低成本和良好的耐腐蚀性而被广泛用于石油和石化行业。通常通过多层和多道次焊接工艺,将不锈钢填充金属与覆层相匹配。在这项研究中,用碳钢填充金属填充了不锈钢复合板的母材,并分析和比较了各种填充金属的接头的组织和力学性能。结果表明,在填充有不锈钢和碳钢填充金属的焊缝中形成局部硬化区(LHZ),这是因为在包含碳钢填充金属的焊缝的第一层中形成了马氏体相。LHZ中的显微硬度值达到425 HV 1,这明显高于贱金属。但是,用碳钢填充金属填充的接头的抗拉强度值与用不锈钢填充金属填充的接头的抗拉强度值相等。侧面弯曲试验的结果表明,LHZ从焊缝突出,并且如果LHZ在接头横截面上的面积大于接头整个横截面的17%,则在LHZ附近会出现裂纹。 。研究结果表明,在不锈钢复合板的焊接中,采用碳钢填充金属填充碳钢母材是可行的。

更新日期:2020-01-07
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