Evaluation Microstructure and Hardness of the Fe-Cr-C Hardfacing Alloy with Cr/C=۶ Ratio
Publish Year: 1400
نوع سند: مقاله ژورنالی
زبان: English
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شناسه ملی سند علمی:
JR_JEFM-5-2_006
تاریخ نمایه سازی: 20 آذر 1400
Abstract:
In this investigation, different amount of carbon and chromium content of Fe-Cr-C hardfacing alloys with the constant ratio of Cr/C=۶ were used. These alloys were fabricated by GTAW on AISI ۱۰۱۰ 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)۷C۳. Moreover with increasing of carbon and chromium content of thicker zone in hardface samples, the volume fraction of (Cr,Fe)۷C۳ 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
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Authors
H Sabet
Department of Materials Engineering, Karaj Branch, Islamic Azad University, Karaj, Iran
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