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Continuous cooling transformation behavior of Alloy 718 |
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| Authors: | L Geng Young-Sang Na and Nho-Kwang Park |
| Affiliation: | a School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China b Korea Institute of Machinery and Materials, 66, Sangnamdong, Changwon, Kyungnam 641-010, South Korea |
| Abstract: | The transformation behavior of Alloy 718 is affected significantly by the cooling rate. The γ″-phase appears at cooling rates less than 20 °C/min and δ-phase appears at grain boundaries as well as the MC type carbides at cooling rates below 5 °C/min. The δ-phase nucleates and grows preferentially at grain boundaries, and less preferentially at the MC carbides. The size of the γ″ and δ-precipitates increases consistently with decreasing cooling rate for the given conditions. The hardness varies with the transformation behavior. A hardness peak was noticed for a cooling rate of 5 °C/min. The hardness peak corresponded to the maximum volume fraction of γ″ which in turn was strongly affected by the presence of the δ-phase. |
| Keywords: | Nickel base superalloy Alloy 718 Continuous cooling transformation Microstructure |
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