Evaluation Microstructure and Hardness of the Fe-Cr-C Hardfacing Alloy with Cr/C=6 Ratio

Journal of Environmental Friendly Materials

دوره 5، شماره 2 - شماره پیاپی 10، اسفند 2021، صفحه 35-43   

نوع مقاله: Original Article

نویسنده

H Sabet

Department of Materials Engineering, Karaj Branch, Islamic Azad University, Karaj, Iran

چکیده

In this investigation, different amount of carbon and chromium content of Fe-Cr-C hardfacing alloys with the constant ratio of Cr/C=6 were used. These alloys were fabricated by GTAW on AISI 1010 mild steel substrates to achieve hypo/eutectic/hyper compositions. OES, XRF, OM, SEM, XRD techniques and HV method were used for determining chemical composition, hardness and studying the microstructure of hardface alloys. The metallographic examination results indicated that all hardface samples had three metallurgical zones with different thickness, microhardness, chemical composition and solidification modes. The microstructures of all hardface samples in thicker Zone consists of austenite and chromium-iron carbides (Cr,Fe)₇C₃. Moreover with increasing of carbon and chromium content of thicker zone in hardface samples, the volume fraction of (Cr,Fe)₇C₃ increased and resulted in the decreasing of austenite volume fraction and increasing hardness of the top surface. A multiple regression model was used to determine the relation between microstructure, chemical composition and hardness

کلیدواژه‌ها

Alloys؛ Cr/C=6؛ Surface Modification؛ Microstructure؛ SEM

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