首页|不同转速下Ti2AlNb合金连续驱动摩擦焊焊接接头的显微组织和力学性能

不同转速下Ti2AlNb合金连续驱动摩擦焊焊接接头的显微组织和力学性能

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采用连续驱动摩擦焊接方法焊接Ti2AlNb基合金,对不同焊接转速(500、1000和1500r/min)下的焊接接头的显微组织和力学性能进行研究.结果表明:接头焊缝区(WZ)完全由再结晶的B2相组成,且B2晶粒尺寸随着转速的增加而减小;焊接过程中热力影响区(TMAZ)发生严重变形,大部分原始析出相溶解的同时,组织中出现明显的流线;热影响区(HAZ)中只有细小的O相发生溶解.转速为1000r/min时,焊接接头力学性能最好,其强度和伸长率均接近母材;转速为500r/min时,焊接接头的力学性能最差.焊后退火处理可以明显消除变形组织,并在接头中重新析出细小的O相,从而大幅提高接头的力学性能.拉伸过程中分解的α2相容易成为裂纹萌生的源头,极大限制接头力学性能的提高.
Micro structure and mechanical properties of continuous drive friction welded Ti2AlNb alloy under different rotational rates
Ti2AlNb-based alloy was joined in a continuous drive friction welding machine under different rotational rates(500,1000 and 1500r/min).The microstructure and mechanical properties of the joints were investigated.It is shown that the weld zone(WZ)is fully composed of recrystallized B2 phase,and the grain size decreases with increasing rotational rate.The thermo-mechanically affected zone(TMAZ)suffers severe deformation during welding,due to which most of original precipitation phase is dissolved and streamlines are present.In the heat affected zone(HAZ),only the fine O phase is dissolved.The as-welded joint produced using 1000r/min has the best mechanical properties,whose strength and elongation are both close to those of the base metal,while the as-welded joint obtained using 500 r/min exhibits the worst mechanical properties.Post-weld annealing treatment annihilates the deformation microstructure and fine O phase precipitates in the joints,consequently improving the mechanical properties significantly.Decomposed α2 phase is a weakness for the mechanical performance of the joint since microcracks are apt to form in it in the tensile test.

Ti2AlNb alloycontinuous drive friction weldingmicrostructuremechanical properties

卜志强、马秀萍、吴家云、吕榛、陈虎、李金富

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上海交通大学材料科学与工程学院金属基复合材料国家重点实验室,上海 200240

中国航发南方工业有限公司,株洲 412002

Ti2AlNb合金 连续驱动摩擦焊 显微组织 力学性能

Science and Technology Special Project,ChinaNational Science and Technology Major Project of ChinaNational Natural Science Foundation of China

K191682017-Ⅵ-0004-007552231002

2024

10.1016/S1003-6326(24)66604-5

中国有色金属学报(英文版)
中国有色金属学会

中国有色金属学报(英文版)

CSTPCD
影响因子：1.183
ISSN：1003-6326
年,卷(期)：2024.34(10)