Abstract
Crack-free TiAl joints were welded by linear friction welding with online stress relieving process. Microstructural examination demonstrates that the joint has a clearly identified weld zone which consists mainly of equiaxed γ grains with a few α2 phase. Lamellar grains in thermo-mechanically affected zones near the weld margin are oriented along with the flow direction of the plasticized material. The microhardness of the joint presents a global increase from the base metal to the weld interface by about 1700 MPa; the tensile strength of the joints ranges from 683 MPa to 717 MPa at ambient temperature, which is comparable to that of the base metal. The refinement strengthening contributes to enhancing the joint strength.
| Translated title of the contribution | 在线去应力退火对线性摩擦焊TiAl合金接头微结构与力学性能的影响机制 |
|---|---|
| Original language | English |
| Pages (from-to) | 2765-2770 |
| Number of pages | 6 |
| Journal | Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering |
| Volume | 50 |
| Issue number | 8 |
| State | Published - Aug 2021 |
Keywords
- Linear friction welding
- Mechanical property
- Microstructure
- Online stress relieving
- TiAl alloys