Microstructure and Texture Distribution Characteristics in Weld Zone of IN718/FGH96 Inertial Friction Welded Joint

Lu ZHANG; Chunbo ZHANG; Zhongxiang LIAO; Yanquan WU; Guodong ZHANG; Jun ZHOU

doi:10.7512/j.issn.1001-2303.2022.04.02

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Microstructure and Texture Distribution Characteristics in Weld Zone of IN718/FGH96 Inertial Friction Welded Joint
Vol. 52, Issue 4, Pages: 8-13(2022)
Received：24 January 2022，

Revised：2022-02-24，

Published：30 April 2022
DOI： 10.7512/j.issn.1001-2303.2022.04.02
稿件说明：

移动端阅览

张露，张春波，廖仲祥，等.IN718/FGH96惯性摩擦焊接头焊缝区微观组织状态与织构分布特征［J］.电焊机，2022，52（4）：8-13. DOI： 10.7512/j.issn.1001-2303.2022.04.02.

ZHANG Lu, ZHANG Chunbo, LIAO Zhongxiang, et al.Microstructure and Texture Distribution Characteristics in Weld Zone of IN718/FGH96 Inertial Friction Welded Joint[J].Electric Welding Machine, 2022, 52(4): 8-13. DOI： 10.7512/j.issn.1001-2303.2022.04.02.

摘要

采用SEM、EBSD等技术表征手段分析IN718+FGH96异质合金惯性摩擦焊接头焊缝区在焊态下的微观组织形貌及织构分布状态。结果表明，原始母材中的γ′、γ″及δ强化相消失，焊缝区转变为单一等轴γ相晶粒，IN718和FGH96侧焊缝区晶粒尺寸分别约为10 μm和15 μm。焊缝区再结晶晶体取向相对杂乱，致使晶体织构强度较弱，可忽略不计。动态再结晶后的焊缝区相邻晶体间以大角度晶界为主，大角度晶界占比达到65.1%。焊缝区大部分γ相的｛111｝<11-1>滑移系在X轴方向载荷下的Schmidt因子接近0.5，γ相晶体的｛111｝<11-1>滑移系在轴向力作用下更容易开动并逐渐形成大量的位错。五组拉伸试样均断裂于焊缝区，其抗拉强度均值为1 126.3 MPa，屈服强度均值为998.9 MPa。

Abstract

The microstructure and texture distribution in weld zone of IN718+FGH96 inertial friction welding joint were analyzed by means of SEM and EBSD. The results show that the γ'

γ"and δ enhanced phases disappear in base material

and the weld zone transforms into a single equiaaxial γ phase grains. The size of weld zone grain on IN718 and FGH96 sides is about 10 μm and 15 μm

respectively. The orientation of the recrystallized crystal in weld zone is disorderly

resulting in weak crystal texture and can be ignored. The large Angle grain boundary is mainly between the adjacent crystals in the weld zone after dynamic recrystallization

and the large Angle grain boundary accounts for 65.1%. The Schmidt factor of {111}<11-1> slip system of γ phase in weld zone is close to 0.5 under the X-axis load.Thus

the {111}<11-1> slip system of γ phase crystal is easier to start and gradually form a large number of dislocations under the action of axial force. Five tensile specimens are all fractured in weld zone. The average tensile strength and yield strength of the specimens are 1126.3 MPa and 998.9 MPa respectively.

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references

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