Analysis of laser beam weldability of Inconel 738 superalloy
| Autor: | R.A. Buckson, Olanrewaju A. Ojo, Afolabi Egbewande |
|---|---|
| Rok vydání: | 2010 |
| Předmět: |
Heat-affected zone
Materials science Mechanical Engineering Metallurgy Weldability technology industry and agriculture Laser beam welding Welding respiratory system Intergranular corrosion Condensed Matter Physics law.invention Superalloy Mechanics of Materials law General Materials Science Inconel Liquation |
| Zdroj: | Materials Characterization. 61:569-574 |
| ISSN: | 1044-5803 |
| DOI: | 10.1016/j.matchar.2010.02.016 |
| Popis: | The susceptibility of pre-weld heat treated laser beam welded IN 738 superalloy to heat affected zone (HAZ) cracking was studied. A pre-weld heat treatment that produced the minimal grain boundary liquation resulted in a higher level of cracking compared to those with more intergranular liquation. This deviation from the general expectation of influence of intergranular liquation extent on HAZ microfissuring is attributable to the reduction in the ability of the base alloy to accommodate welding tensile stress that accompanied a pre-weld heat treatment condition designed to minimize intergranular liquation. Furthermore, in contrast to what has been generally reported in other nickel-based superalloys, a decrease in laser welding speed resulted in increased HAZ cracking in the IN 738, which can be attributed to exacerbated process instability at lower welding speeds. |
| Databáze: | OpenAIRE |
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