Abstract
BZn18-26 cupronickel alloy with 4 mm in thickness was friction stir welded using SKD61 tool steel pin tool. Microstructure and mechanical properties of the joints were studied. The results show that due to high strength and hardness of cupronickel alloy, severe wear is happened to the pin tool and lack of penetration is formed at the bottom of the weld. Fiber grains can be seen along the rolling direction of the base metal, while fine equiaxed grains are formed in the nugget zone by dynamic recrystallization. The grains in the thermo-mechanically affected zone are recrystallized and deformed grains also remain. Grains in the heat affected zone are recrystallized and grown. The hardness of weld and heat affected zone is lower than that of the base metal, and the lowest hardness region of the welded joint is in the nugget zone due to completely dynamic recrystallization. All the defect-free welded joints are fractured in the nugget zone with ductile fracture mode during the tensile test.
| Translated title of the contribution | Microstructural characteristics and mechanical properties of friction stir welded cupronickel alloy |
|---|---|
| Original language | Chinese (Traditional) |
| Pages (from-to) | 814-820 |
| Number of pages | 7 |
| Journal | Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) |
| Volume | 50 |
| Issue number | 4 |
| DOIs | |
| State | Published - 26 Apr 2019 |
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