Title of article
Effect of Cooling Rate on The Microstructures And Hardness Of Fe-Ni-Cr Superalloy
Author/Authors
Ridhwan, J. Universiti Teknikal Malaysia Melaka - Faculty of Mechanical Engineering, Malaysia , Hamzah, E. Universiti Teknologi Malaysia - Faculty of Mechanical Engineering, Malaysia , Effendy, H. Universiti Teknikal Malaysia Melaka - Faculty of Mechanical Engineering, Malaysia , Selamat, M.Z. Universiti Teknikal Melaysia Melaka - Faculty of Mechanical Engineering, Melaysia , Zulfattah, Z. Universiti Teknikal Malaysia Melaka - Faculty of Mechanical Engineering, Malaysia
From page
45
To page
57
Abstract
Fe-Ni-Cr superalloy is a heat resistant material that shows good mechanical strength and resistance to oxidation and corrosion at high temperature. Heat treatment was conducted on Fe-Ni-Cr superalloy to observe its effect on the microstructures and mechanical property namely hardness. Solution treatment were carried out at 900oC, 975oC, 1050oC, and 1125 oCfollowed by two cooling methods i.e quenching and air cool. The samples were analyzed by using materials characterization techniques such as SEM, XRD, and optical microscope. The Fe-Ni-Cr superalloy formed mainly dendritic austenitic structure with Cr23C6 precipitated along the grain boundaries. Increase in solution treatment temperature results indissolution of chromium carbide, coarser grain, and lower hardness. Different cooling rate after solution treatment shows that fast cooling produces fewer and finer chromium carbide (Cr23C6) precipitates, finer grain, and higher hardness as compared with slow cooling rate. Highest hardness value which is 213.5 Hv was recorded on sample solution treated at 900oC followed by water quenched.
Keywords
Fe , Ni , Cr superalloy , Solution treatment , Cooling rate , Precipitation
Journal title
Journal of Mechanical Engineering and Technology (JMET)
Journal title
Journal of Mechanical Engineering and Technology (JMET)
Record number
2583010
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