Liquation Cracking in the Heat-Affected Zone of IN738 Superalloy Weld
| Autor: | Leu-Wen Tsay, Ren-Kae Shiue, Tai-Cheng Chen, Kai-Cheng Chen |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
lcsh:TN1-997
Heat-affected zone Materials science Alloy Intermetallic IN738 superalloy 02 engineering and technology Electron microprobe engineering.material welding HAZ cracking microconstituent 01 natural sciences Carbide 0103 physical sciences General Materials Science Liquation lcsh:Mining engineering. Metallurgy 010302 applied physics Metallurgy Metals and Alloys 021001 nanoscience & nanotechnology Superalloy Cracking engineering 0210 nano-technology |
| Zdroj: | Metals; Volume 8; Issue 6; Pages: 387 Metals, Vol 8, Iss 6, p 387 (2018) |
| ISSN: | 2075-4701 |
| DOI: | 10.3390/met8060387 |
| Popis: | The main scope of this study investigated the occurrence of liquation cracking in the heat-affected zone (HAZ) of IN738 superalloy weld, IN738 is widely used in gas turbine blades in land-based power plants. Microstructural examinations showed considerable amounts of γ’ uniformly precipitated in the γ matrix. Electron probe microanalysis (EPMA) maps showed the γ-γ’ colonies were rich in Al and Ti, but lean in other alloy elements. Moreover, the metal carbides (MC), fine borides (M3B2 and M5B3), η-Ni3Ti, σ (Cr-Co) and lamellar Ni7Zr2 intermetallic compounds could be found at the interdendritic boundaries. The fracture morphologies and the corresponding EPMA maps confirmed that the liquation cracking in the HAZ of the IN738 superalloy weld resulted from the presence of complex microconstituents at the interdendritic boundaries. |
| Databáze: | OpenAIRE |
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