Characterization of in situ synthesized TiC particle reinforced Fe-based composite coatings produced by multi-pass overlapping GTAW melting process

被引：80

作者：

Wang, X. H. ^{[1
]}

Song, S. L. ^{[1
]}

Qu, S. Y. ^{[1
]}

Zou, Z. D. ^{[1
]}

机构：

[1] Shandong Univ, Sch Mat Sci & Engn, Jinan 250061, Peoples R China

来源：

SURFACE & COATINGS TECHNOLOGY | 2007年 / 201卷 / 12期

基金：

高等学校博士学科点专项科研基金;

关键词：

GTAW; TiC particles; wear properties; multi-pass overlapping melting process;

D O I：

10.1016/j.surfcoat.2006.10.042

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

In this paper, in situ synthesized TiC particles reinforced Fe-based surface composite coatings by multi-pass overlapping gas tungsten arc welding (GTAW) melting process employing a proper amount of graphite and ferrotitanium (FeTi) on AISI 1020 steel substrate was produced. The microstructure and wear properties of the composite coatings were investigated by means of an electron microprobe microanalysis (EPMA), X-ray diffractometer and wear tester. The results showed that the multi-pass overlapping GTAW melting surface composite coatings can be obtained under suitable welding parameters, and no crack and porosity are found in the tracks. The X-ray and EPMA results confirm that TiC particles can be formed via reaction of FeTi and graphite during multi-pass overlapping GTAW melting process. TiC particles present cubic and dendrite shape in the non-overlapping zone. It is found that there occurred TiC particles coarsening at the overlap regions, which can lead to detrimental effects on the hardness and wear performance. Composite coatings give a high hardness and excellent wear resistance; and the wear friction coefficient of the coating is less than that of the 1020 steel. As a result, multi-pass overlapping GTAW melting process can be used effectively for producing surface composite coatings with a pre-placed powder to improve wear resistance of the AISI 1020 steel. (c) 2006 Elsevier B.V All rights reserved.

引用

页码：5899 / 5905

页数：7

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