Effect of titanium content on microstructure and wear resistance of Fe-Cr-C hardfacing layers

被引：1

作者：

Zhou, Y.F. ^{[1
]}

Yang, Y.L. ^{[1
]}

Li, D. ^{[2
]}

Yang, J. ^{[1
]}

Jiang, Y.W. ^{[1
]}

Ren, X.J. ^{[3
]}

Yang, Q.X. ^{[1
]}

机构：

[1] State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao, China

[2] School of Material Science and Engineering, Southwest Jiaotong University, Chengdu, China

[3] School of Engineering, Liverpool John Moores University, Liverpool, United Kingdom

来源：

Welding Journal | 2012年 / 91卷 / 08期

关键词：

Chromium alloys - Scanning electron microscopy - Titanium carbide - Wear resistance - Iron alloys - Lattice theory - Solidification - Titanium alloys - Iron compounds - Spectrometers - X ray diffraction;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

Layers of Fe-Cr-C hardfacing material containing various amounts of titanium were deposited on ASTM 1045 steel base metal. Optical microscope (OM), field emission scanning electron microscope (FESEM) with energy-dispersive spectrometer (EDS), and X-ray diffraction (XRD) were used to investigate the effect of titanium content on the microstructural characteristics of Fe-Cr-C hardfacing layers. The solidification sequence calculation and lattice misfit theory were employed to discuss the M7C3 carbide refinement mechanism. The experimental results show the microstructures of Fe-Cr-C hardfacing layers consist of primary (Cr, Fe)7C3 carbides and the eutectic phases (γ-Fe+(Cr, Fe)7C3). In the solidification process, the formation and growth of the primary (Cr, Fe)7C3 carbides occur along their long axis, which parallels the direction of heat flow. With the increase of titanium content, the primary (Cr, Fe)7C3 carbides are refined. However, it is not proper to increase titanium content without limits. When titanium content reaches 1.17 wt-%, its microstructure changes from a hypereutectic form to a hypoeutectic one. The thermodynamic calculation shows MC carbide precipitates prior to M7C3 carbide from Fe-C-Cr-Ti alloy. Moreover, the lattice misfit between (110)TiC and (010)Cr7C3 is 9.257%, which indicates that TiC acting as heterogeneous nuclei of the Cr 7C3 is medium effective. Therefore, M7C 3 carbide can be refined significantly.

引用