Heat Treatment to Improve Fatigue Strength of Friction Stir Welded Ti-6Al-4V Alloy Butt Joint

被引：4

作者：

Nakai, Masaaki ^{[1
]}

Niinomi, Mitsuo ^{[2
,3
,4
,5
]}

Ishida, Yu ^{[2
]}

Liu, Huihong ^{[6
]}

Fujii, Hidetoshi ^{[6
]}

Ninomiya, Takashi ^{[7
]}

机构：

[1] Kindai Univ, Fac Sci & Engn, Higashiosaka, Osaka 5778502, Japan

[2] Tohoku Univ, Inst Mat Res, Sendai, Miyagi 9808577, Japan

[3] Osaka Univ, Grad Sch Engn, Osaka 5650871, Japan

[4] Meijyo Univ, Grad Sch Sci & Technol, Nagoya, Aichi 4688502, Japan

[5] Nagoya Univ, Inst Mat & Syst Sustainabil, Nagoya, Aichi 4648603, Japan

[6] Osaka Univ, Joining & Welding Res Inst, Ibaraki 5670047, Japan

[7] Kawasaki Heavy Ind Co Ltd, Aerospace Co, Kakamigahara 5048710, Japan

来源：

MATERIALS TRANSACTIONS | 2017年 / 58卷 / 08期

关键词：

titanium alloy; friction stir welding; fatigue; MECHANICAL-PROPERTIES;

D O I：

10.2320/matertrans.M2017117

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A post-weld heat treatment process, that is, solution treatment and aging, was found to be effective in improving the fatigue strength of friction stir welded Ti-6Al-4V butt joints. The stir-zone microstructure was changed by friction stir welding, from an equiaxed-a structure to a lamellar structure, but equiaxed-a structure remained in the base metal. Subsequently, solution treatment and aging modified these microstructures to bimodal structures in both the stir zone and base metal. The hardness in the stir zone differed from the base metal after friction stir welding, but the difference was eliminated by solution treatment and aging. The fatigue strength of friction stir welded Ti-6Al-4V butt joints was successfully increased by solution treatment and aging, which was higher than that of the parent Ti-6Al-4V plate. This indicates that solution treatment and aging increases the fatigue strength of friction stir welded Ti-6Al-4V butt joints by the formation of similar bimodal structures in the stir zone and base metal, resulting in reduced stress concentration at these boundaries and retarded fatigue failure.

引用

页码：1223 / 1226

页数：4

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