Study on high temperature tensile properties for laser butt welding plate of Inconel718 superalloy with Ultra-fine Grain
With a view to successfully forming multi-sheet cylinder sandwich structure of Inconel718 superalloy,high temperature plasticity of the laser butt welding plate for Inconel718 superalloy with ultra-fime grain was studied in this paper.The experiment results show that tensile direction has great effect on elongation of laser welding butt plate.When the tensile direction is vertical to laser welding seam,maximum elongation reaches 458.56% at temperature of 950 ℃ and strain rate of 3.1×10-4s-1,in which value ofm is 0.352 and welding seam is not deformed.When the tensile direction is parallel to laser welding seam,the maximum elongation is 178.96% at 965 ℃ with strain rate of 6.2×10-4s-1.Value of m is 0.261,and welding seam contributes to the deformation.In the experiment,with tensile direction vertical to laser welding seam,values of m are higher than 0.3 and welding seams are not deformed.Whereas,with tensile direction paralled to laser welding,welding seams are parts of the deformation and values of m are less than 0.3.Before welding seam is stretched,microstructure in the center is fine equiaxed dendrite,and at the edge is columnar crystal.Meanwhile,there is Laves phase with high content Nb precipitated in the welding seam.
Inconel718 high temperature tensile laser butt welding plate microstructure LBW
Qu FengSheng Liu XuGuang Xing Fei Zhang KaiFeng
Chongqing University, College of Material Science and Engineering, Chongqing 400030 Harbin Institute of Technology, School of Materials Science and Engineering, Harbin 150001
国际会议
上海
英文
247-247
2012-10-19（万方平台首次上网日期，不代表论文的发表时间）