Microstructural evolution and mechanical properties of TIG welded superalloy GH625
| Autor: | Zhen-wei Wei, Chang-kui Liu, Chun-hu Tao, Yu-li Gu |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
010302 applied physics
Austenite Heat-affected zone Materials science Gas tungsten arc welding Metallurgy Metals and Alloys 02 engineering and technology Welding 021001 nanoscience & nanotechnology Geotechnical Engineering and Engineering Geology Condensed Matter Physics 01 natural sciences Indentation hardness Grain size law.invention Superalloy law 0103 physical sciences Materials Chemistry Grain boundary 0210 nano-technology |
| Zdroj: | Transactions of Nonferrous Metals Society of China. 26:100-106 |
| ISSN: | 1003-6326 |
| Popis: | The tungsten inert gas welding (TIG) technique was employed to weld the nickel-based wrought superalloy GH625, and the microstructures, element distribution, grain boundary character and mechanical properties of the welded joint were investigated systematically. The results indicated that the welded seam was of austenite dendrite crystal structure and no obvious heat affected zone (HAZ) was observed. A number of precipitated δ phases with homogeneous distribution were observed in the interdendritic region of the weld fusion zone. The abnormal phenomenon observed in the weld fusion zone of GH625, i.e., higher hardness and larger grain size compared with the base metal, may be attributed to the precipitated δ phase in the weld fusion zone. The higher tensile strength in the base metal was mainly attributed to the presence of more contents of fine grains and twin boundaries, while the lower elongation in the welded joint was mainly owing to the precipitated δ phase. |
| Databáze: | OpenAIRE |
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