热输入对S43932超纯铁素体不锈钢焊接接头组织性能的影响

对1.0 mm厚度的S43932不锈钢冷轧板分别进行88、101、132、188 J/mm的钨极氩弧焊焊接，研究了焊接区的显微形貌和相组成。详细分析了垂直焊缝、平行焊缝和带缺口焊缝试样的拉伸性能及焊缝杯突试验结果，当热输入为101 J/mm时，焊接接头具有最佳的拉伸及成形性能匹配，之后随热输入＞101 J/mm，焊接接头抗拉强度和埃里克森杯突值急剧下降。焊接接头良好的力学性能与焊接区小尺寸晶粒的形成及大量富Ti(Nb,Ti)(C,N)相的析出有关。

Influence of Heat Input on Microstructure and Properties of Welded Joint of S43932 Ultra-pure Ferritic Stainless Steel

S43932 stainless steel cold rolled plate with a thickness of 1.0 mm is welded with heat input of 88 、101、 132 and 188 J/mm by tungsten inert gas welding,and the micro-morphologies and phase constitutes of the weld zone are investigated.By the systematic analysis of the tensile properties of welded specimens when perpendicular to and parallel to weld seam,and with notch weld seam and the weld seam Erichsen cupping test results,it is found that when the heat input   is 101 J/mm,the welded joint has optimum matching of tensile and forming performance.However, when the heat input larger than 101 J/mm,the tensile strength and Erichsen cupping value of the welded joint decreases drastically. The formation of small grains and the precipitation of Ti-riched(Nb,Ti)(C,N)phase in the weld zone lead to good mechanical properties of the welded joint.