摘要
本工作针对航空发动机整体叶盘常用材料TC17钛合金进行线性摩擦焊试验研究,主要通过OM、SEM、显微硬度和常温拉伸试验方法对不同热处理状态下接头组织的形貌和力学性能进行分析。研究发现,由于焊接过程中复杂的热力耦合作用,接头组织形成了典型的焊缝区、热机影响区和热影响区,且焊接接头性能显著降低;而经过焊后热处理,由于亚稳定β相和亚稳定α相分解,析出弥散分布的针状α相使接头性能大幅提高,常温拉伸都断于母材处;并且弥散分布的针状α相的强化效果与热处理温度密切相关,通过合理热处理制度可以实现TC17线性摩擦焊接头强度和塑性的合理匹配,提高接头的综合性能。
In this paper,the linear friction welding test of TC17 titanium alloy,a common material of integral blade disc of aeroengine,was conducted.The microstructure morphology and mechanical properties of joints under different heat treatment conditions were analyzed by OM,SEM,microhardness and tensile test at room temperature.It is found that due to the complex thermal coupling effect in the welding process,the typical microstructure of the welding seam area,the thermal engine influence area and the thermal influence area are formed,and the welding joint perfor-mance is significantly reduced.After heat treatment after welding,thanks to the decomposition of the metastableβphase and the metastableαphase,the diffusely distributed needle-αphase was separated out,which greatly improved the joint performance.Moreover,the diffusely distributed needle-beam strengthening effect is closely related to the heat treatment temperature.The reasonable match between the strength and plasti-city of TC17 linear friction welded joint can be achieved through a reasonable heat treatment system,thus improving the joint’s comprehensive performance.
作者
李睿
周军
梁武
张春波
乌彦全
LI Rui;ZHOU Jun;LIANG Wu;ZHANG Chunbo;WU Yanquan(Heilongjiang Provincial Key Laboratory of Advanced Friction Welding Technology and Equipment,Harbin Welding Institute Limited Company,Harbin 150028,China)
出处
《材料导报》
EI
CAS
CSCD
北大核心
2021年第20期20057-20061,共5页
Materials Reports
基金
国家科技重大专项(2018ZX04010001)
黑龙江省科技计划省院科技合作项目(YS20A19)。
关键词
焊后热处理
TC17钛合金
线性摩擦焊
组织分析
力学性能
post-weld heat treatment
TC17 titanium alloy
linear friction welding
microstructure analysis
mechanical properties
