热处理对哈氏合金X焊接接头组织与性能的影响

Effect of Heat Treatment on Microstructure and Properties of Hastelloy X Welded Joints

摘要:

本实验研究不同热处理工艺对哈氏合金X焊接接头组织和力学性能的影响,分析焊后热处理对哈氏合金X焊接接头性能的影响规律。结果表明：焊缝中心区域组织主要以等轴晶为主,熔合区以枝晶为主。经1050℃热处理的焊缝未析出二次相,经1100℃处理的焊缝在晶界处与晶粒内析出大量二次相,经1150℃处理的焊缝析出物发生重溶。经1150℃热处理工艺后接头抗拉强度最高达773.49 MPa；经1100℃处理的焊接接头断裂形式为沿晶脆性断裂,其他焊缝接头的断裂形式为韧性断裂。

Abstract:

Effect of different heat treatment processes on the microstructure and mechanical properties of TIG welded Hastelloy X welded joints was studied by SEM and EDS. The results showed that the central area of the weld was mainly composed of fine equiaxed grains, and the fusion zone was dominated by dendrites. The secondary phase was not precipitated in the weld joints heat treated at 1050°C, and a large number of secondary phases were precipitated in the grains at the grain boundary at 1100°C. The secondary phase at 1150°C were partly re-dissolved. The tensile strength of joint reaches up to 773.49 MPa after heat treatment at 1150°C. The joint treated at 1100°C was intergranular fractures, the rest were ductile fractures.