大厚度TA 15钛合金板潜弧焊接头的组织及拉伸性能

摘要

Under the condition of adding TA1 pure titanium middle layer filling plate,hidden arc welding test was carried out on TA15 titanium alloy plates with thickness of 64 mm,the microstructure,tensile properties of welded joint and hydrogen,oxygen,nitrogen content in weld seam were analyzed;Tensile properties of the welded joint adding interlayer were compared with that of the ordinary hidden arc welded joint without interlayer.Results show that the microstructure of the weld seam zone of welded joint adding interlayer was larger size of columnar crystal,intracrystalline acicularα′phase distributed in different directions,the primaryαphase and a small amount ofβphase tissue were in the base metal area,αphase andα′phase were found in heat affected zone.After adding middle layer,the tensile strength of the welded joint was lower than ordinary hidden arc welded joints,but its plastic increased significantly,the contents of hydrogen,oxygen and nitrogen in the welded joint were lower than those in the base metal.%在添加TA1纯钛中间层填充板的条件下，对64 mm厚TA15钛合金板进行潜弧焊接，分析了焊接接头的显微组织、拉伸性能以及焊缝中氢、氧、氮的含量，并与不添加中间层的普通潜弧焊接头的拉伸性能进行了对比。结果表明：添加中间层后焊接接头的焊缝区组织为较大尺寸的柱状晶，晶内分布着不同方向的针状α′相，母材区组织为初生α相和少量β相，热影响区组织中既存在α相，也存在α′相；添加中间层后焊接接头的抗拉强度比普通潜弧焊接头的有所降低，但其塑性显著提高，焊缝中氢、氧、氮的含量比母材中的有所降低。