Microstructure, mechanical properties and residual stress distribution in pulsed tungsten inert gas welding of Ti–5Al–2.5Sn alloy
| Autor: | Muhammad Rashid Mirza, Mirza Nadeem Baig, Massab Junaid, Fahd Nawaz Khan |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
010302 applied physics
Materials science Distribution (number theory) Mechanical Engineering Metallurgy Alloy technology industry and agriculture chemistry.chemical_element 02 engineering and technology Welding Tungsten engineering.material 021001 nanoscience & nanotechnology Microstructure 01 natural sciences law.invention chemistry Residual stress law 0103 physical sciences engineering General Materials Science 0210 nano-technology Inert gas |
| Zdroj: | Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications. 233:2030-2044 |
| ISSN: | 2041-3076 1464-4207 |
| DOI: | 10.1177/1464420718811364 |
| Popis: | Pulsed tungsten inert gas welding with full penetration was performed on 1.6 mm thick Ti–5Al–2.5Sn alloy sheet. Hole-drill strain measurement method was employed to measure the distribution of residual stresses across the weld line. Tensile tests were performed on the specimens sectioned in transverse direction of the welded sample. The evolved microstructure in the welded zone was investigated by metallography and X-ray diffraction. Transverse residual stresses of tensile nature were present at different depths below the surface and decreased the yield strength and ultimate tensile strength. However, this decrease was not dependent on the maximum value of transverse residual stress. Fracture location was found to be dependent on the micro-hardness profile and fracture took place in base metal where micro-hardness was the lowest. Furthermore, the presence of tensile residual stresses in the welded sample had no influence on the fractured surface morphology. Peak current and background current had a significant influence on the fusion zone width, heat-affected zone width, and fusion zone grain size. |
| Databáze: | OpenAIRE |
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