8mm厚16MnR与2205双相不锈钢的焊接性分析研究
Study on the weldability of 8mm 16MnR and 2205 Duplex Stainless Steel
杨莉；张占哲
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作者单位：1-常熟理工学院 机械工程学院 江苏 常熟 215500
2-华北水利水电学院 机械学院 河南 郑州 450011
中文关键字：2205双相不锈钢；FCAW；组织；力学性能；耐腐蚀性
英文关键字：dissimilar metal duplex stainless steel phase ratio mechanical property
中文摘要：对8mm厚的异种金属16MnR与2205双相不锈钢进行了焊接性分析研究。结果表明：在接头的16MnR-焊缝界面，在熔合线附近的16MnR侧存在“脱碳层”，而在焊缝一侧存在“增碳层”；焊缝组织为奥氏体+针状铁素体，奥氏体的含量多一些，且焊接接头钨极氩弧焊侧组织更加细小、均匀；焊接接头的抗拉强度达到578MPa，断裂位置发生在16MnR母材上，断口呈现韧性断裂模式，且具有良好的塑性；16MnR与焊缝界面硬度分布整体呈现一上升的趋势，焊缝区硬度最高，其次是热影响区，16MnR母材出现低硬度区，在熔合线附近靠近焊缝侧出现一峰值，而2205-焊缝界面，热影响区的平均硬度最高，焊缝的平均硬度最低，且焊接接头钨极氩弧焊焊缝的平均硬度大于手工电弧焊侧。为了保证焊接接头的力学性能和耐蚀性能，采用奥氏体形成元素Ni含量比较高的焊材及合适的线能量，并控制层间温度，减小熔合比。
英文摘要：On the basis of the analysis of composition, microstructure, properties and weldability of 2205 duplex stainless steel, the flux cored arc welding (FCAW) process is made. Then the microstructure, mechanical properties and corrosion resistance of welded joint were analyzed. The results shows using FCAW process, in order to obtain high strength, perfect impact toughness and overall and partial resistance to stress corrosion in welded joint, the Ni content of duplex stainless steel welding material should be 2% to 4% higher than that of base metal, multi-layer and multi-channel welding is adopted with the strict control of energy input less than or equal to 0.926KJ/mm, layer temperature is less than 120 ℃, thus the appropriate proportion of two-phase structure in the welded joint can be got. Using a reasonable welding procedure, the microstructure in weld beam is austenite (A) + ferrite (F), and in heat affected zone is ferrite (F) + austenite (A) + a small amount of third phase, the content of austenite in weld beam and heat affected zone is higher than that of the base metal. Tensile strength of the welded joint is up to 854.5MPa and the fracture occurs in the base metal and the heat affected zone. The welded joint has high strength, good plasticity, toughness and corrosion resistance.