厚板TC4钛合金电子束焊接头组织演变规律
发布时间：2018-11-06 10:52
【摘要】：针对厚板TC4钛合金电子束焊接头组织不均匀性,研究焊接热输入对20 mm厚TC4钛合金的电子束焊接头组织演变规律的影响.结果表明,采用中等热输入时,钛合金接头在熔宽和熔深方向均存在较大的不均匀性,接头上部的晶粒尺寸均大于中部和下部,焊缝上部和中部生成了晶间α相和粗大的魏氏组织,增加焊缝脆性,降低焊缝塑性.增大焊接热输入会使晶粒和组织粗化,但是可以减小组织的不均匀性;而减小焊接热输入,会使晶粒和组织细化,但是组织不均匀性增大,且增加了气孔的数量.焊缝组织的不均匀性会导致力学性能的梯度较大,焊缝组织越粗大,抗拉强度越小.
[Abstract]:The effect of welding heat input on the microstructure evolution of electron beam welding joint of thick TC4 titanium alloy was studied in the light of the inhomogeneity of electron beam welding joint of thick plate TC4 titanium alloy, and the effect of welding heat input on microstructure evolution of electron beam welding joint of 20 mm thick TC4 titanium alloy was studied. The results show that the inhomogeneity of the width and penetration direction of the titanium alloy joint is larger than that of the middle part and the lower part of the joint, and the grain size of the upper part of the joint is larger than that of the middle part and the lower part of the joint. In the upper and middle part of the weld, the intergranular 伪 phase and the coarse Weiss structure are formed, which increases the brittleness of the weld and reduces the plasticity of the weld. Increasing welding heat input will coarsening the grain and microstructure, but it can reduce the inhomogeneity of microstructure, while decreasing welding heat input will refine the grain and microstructure, but increase the inhomogeneity of microstructure and increase the number of pores. The inhomogeneity of weld microstructure leads to a larger gradient of mechanical properties, and the larger the weld microstructure, the smaller the tensile strength.
【作者单位】： 南昌航空大学轻合金加工科学与技术国防重点学科实验室;
【基金】：轻合金加工科学与技术国防重点学科实验室开放基金(gf201501005) 南昌航空大学研究生创新专项资金(YC2015030)
【分类号】：TG457.19
[Abstract]:The effect of welding heat input on the microstructure evolution of electron beam welding joint of thick TC4 titanium alloy was studied in the light of the inhomogeneity of electron beam welding joint of thick plate TC4 titanium alloy, and the effect of welding heat input on microstructure evolution of electron beam welding joint of 20 mm thick TC4 titanium alloy was studied. The results show that the inhomogeneity of the width and penetration direction of the titanium alloy joint is larger than that of the middle part and the lower part of the joint, and the grain size of the upper part of the joint is larger than that of the middle part and the lower part of the joint. In the upper and middle part of the weld, the intergranular 伪 phase and the coarse Weiss structure are formed, which increases the brittleness of the weld and reduces the plasticity of the weld. Increasing welding heat input will coarsening the grain and microstructure, but it can reduce the inhomogeneity of microstructure, while decreasing welding heat input will refine the grain and microstructure, but increase the inhomogeneity of microstructure and increase the number of pores. The inhomogeneity of weld microstructure leads to a larger gradient of mechanical properties, and the larger the weld microstructure, the smaller the tensile strength.
【作者单位】： 南昌航空大学轻合金加工科学与技术国防重点学科实验室;
【基金】：轻合金加工科学与技术国防重点学科实验室开放基金(gf201501005) 南昌航空大学研究生创新专项资金(YC2015030)
【分类号】：TG457.19
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