Wear-resistant amorphous and nanocomposite steel coatings

被引：113

作者：

Branagan, DJ ^{[1
]}

Swank, WD ^{[1
]}

Haggard, DC ^{[1
]}

Fincke, JR ^{[1
]}

机构：

[1] Idaho Natl Lab, Idaho Falls, ID 83415 USA

来源：

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | 2001年 / 32卷 / 10期

关键词：

D O I：

10.1007/s11661-001-0051-8

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In this article, amorphous and nanocomposite thermally deposited steel coatings have been formed by using both plasma and high-velocity oxy-fuel (HVOF) spraying techniques. This was accomplished by developing a specialized iron-based composition with a low critical cooling rate (approximate to 10(4) K/s) for metallic glass formation, processing the alloy by inert gas atomization to form micron-sized amorphous spherical powders, and then spraying the classified powder to form coatings. A primarily amorphous structure was formed in the as-sprayed coatings, independent of coating thickness. After a heat treatment above the crystallization temperature (568 degreesC), the structure of the coatings self-assembled (i.e., devitrified) into a multiphase nanocomposite micro structure with 75 to 125 nm grains containing a distribution of 20 nm second-phase grain-boundary precipitates. Vickers microhardness testing revealed that the amorphous coatings were very hard (10.2 to 10.7 GPa), with further increases in hardness after devitrification (11.4 to 12.8 GPa). The wear characteristics of the amorphous and nanocomposite coatings were determined using both two-body pin-on-disk and three-body rubber wheel wet-slurry sand tests. The results indicate that the amorphous and nanocomposite steel coatings are candidates for a wide variety of wear-resistant applications.

引用

页码：2615 / 2621

页数：7

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