Microstructural and Mechanical Characterization of Cr-based Precipitate-Strengthened Alloys
Risma Yulita Sundawa (a), Eni Sugiarti (b), Asep Ridwan Setiawan (a), Hermawan Judawisastra (a), Safitry Ramandhany (b,c), Nurul Latifah (b), Kurotun Aini (b,c), Muhamad Sar^i (b)

(a) Faculty of Mechanical and Aerospace Engineering, ITB
(b) Research Center for Energy Materials, BRIN
(c) Faculty of Mathematics and Natural Sciences, UI

Abstract

Precipitate-strengthened Cr-based alloys have recently emerged as promising candidates for advanced high-temperature applications, offering superior economic value compared to Ni-based alloys and improved mechanical properties and oxidation resistance compared to Fe-based alloys. Inspired by the excellent properties of the \gamma-\gamma^{^} system in Ni-based alloys, alloy composition and heat-treatment parameters in this study were simulated using OpenCALPHAD to obtain \beta-Cr and \beta^{^}-NiAlphases. This study focuses on the development of precipitate-strengthened Cr-based model alloys with the composition Cr-20Fe-10Ni-10Al (at.%). The alloys were synthesized using an arc-melting furnace and subsequently subjected to a two-step controlled heat treatment: solution treatment at 1400^{o}C followed by aging at 800^{o}C and rapid quenching. The microstructure, phase formation, and hardness of the alloys were systematically analyzed using SEM-EDS, XRD, and Vickers hardness testing.

Keywords: Alloys, High-temperature materials, Cr-based, Heat-treatment, Precipitates strengthening

Topic: Material Physics