| Autor: |
Ridhwan, J., Hamzah, E., Selamat, M. Z., Zulfattah, Z., Hafidzal, M. H. M. |
| Předmět: |
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| Zdroj: |
International Journal of Automotive & Mechanical Engineering; Jul/Dec2013, Vol. 8, p1430-1441, 12p |
| Abstrakt: |
Aging treatment was conducted on Fe-Ni-Cr superalloy to observe its effect on the microstructures and hardness of the material. Solution treatments were carried out at 900°C, 975°C, 1050°C, and 1125°C followed by water quenching. The samples were further treated with a double aging treatment at 720°C and 650°C for 4 hours and 12 hours respectively. Materials characterization techniques such as SEM, XRD, and optical microscopy were used to analyze the heat-treated samples. The Fe-Ni-Cr superalloy formed mainly a dendritic austenitic structure with Cr23C6 precipitated along the grain boundaries. Increase in solution treatment temperature results in dissolution of chromium carbide, coarser grain, and lower hardness for non-aged samples. Double aging treatment produced more chromium carbide, higher hardness, but no apparent change in grain size. Neither quenching nor aging treatments caused any phase transformation. The highest hardness value of 220.4 Hv was recorded for the sample solution treated at 1125°C for 2 hours and water quenched, followed by 2-step aging at temperature 720°C and 650°C for 4 hours and 12 hours respectively, and air cooled. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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