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標題: Microstructural Evolution of Hypoeutectic, Near-Eutectic, and Hypereutectic High-Carbon Cr-Based Hard-Facing Alloys
作者: Lin, C.M.
Chang, C.M.
Chen, J.H.
Hsieh, C.C.
Wu, W.
關鍵字: white cast-iron;(cr,fe)(23)c-6 carbides;tribological properties;hardfacing alloys;wear;coatings;steel;corrosion;behavior
Project: Metallurgical and Materials Transactions a-Physical Metallurgy and Materials Science
期刊/報告no:: Metallurgical and Materials Transactions a-Physical Metallurgy and Materials Science, Volume 40A, Issue 5, Page(s) 1031-1038.
A series of high-carbon Cr-based hard-facing alloys were successfully fabricated on a substrate of 0.45 pct C carbon steel by gas tungsten arc welding (GTAW) process using various alloy fillers with chromium and chromium carbide, CrC (Cr:C = 4:1) powders. These claddings were designed to observe hypoeutectic, near-eutectic, and hypereutectic structures with various (Cr,Fe)(23)C(6) and (Cr,Fe)(7)C(3) carbides at room temperature. According to X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), and optical microscopy (OM), in 3.8 pct C cladding, the microstructure consisted of the primary carbides with outer shells (Cr,Fe)(23)C(6) surrounding (Cr,Fe)(7)C(3) cores and [alpha + (Cr,Fe)(23)C(6)] eutectic structures. In 5.9 pct C cladding, the composite comprised primary (Cr,Fe)(7)C(3) as the reinforcing phase and [alpha + (Cr,Fe)(7)C(3)] eutectic structures as matrix. Various morphologies of carbides were found in primary and eutectic (Cr,Fe)(7)C(3) carbides, which included bladelike and rodlike (with a hexagonal cross section). The 5.9C cladding with great amounts of primary (Cr,Fe)(7)C(3) carbides had the highest hardness (approximately HRC 63.9) of the all conditions.
ISSN: 1073-5623
DOI: 10.1007/s11661-009-9784-6
Appears in Collections:材料科學與工程學系

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