Microstructural Evolution of Hypoeutectic, Near-Eutectic, and Hypereutectic High-Carbon Cr-Based Hard-Facing Alloys

被引：27

作者：

Lin, Chi-Ming ^{[1
]}

Chang, Chia-Ming ^{[1
]}

Chen, Jie-Hao ^{[1
]}

Hsieh, Chih-Chun ^{[1
]}

Wu, Weite ^{[1
]}

机构：

[1] Natl Chung Hsing Univ, Dept Mat Sci & Engn, Taichung 402, Taiwan

来源：

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | 2009年 / 40A卷 / 05期

关键词：

WHITE CAST-IRON; (CR; FE)(23)C-6; CARBIDES; TRIBOLOGICAL PROPERTIES; HARDFACING ALLOYS; WEAR; COATINGS; STEEL; CORROSION; BEHAVIOR;

D O I：

10.1007/s11661-009-9784-6

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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.

引用

页码：1031 / 1038

页数：8