Microstructure and Wear Properties of High-Pressure Torsion Processed Iron
Microstructure and Wear Properties of High-Pressure Torsion Processed Iron
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DOI：
10.4028/www.scientific.net/msf.890.371
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发表时间：
2017-03
期刊：
影响因子：
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通讯作者：
H. Kato;Y. Todaka
中科院分区：
文献类型：
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作者：
H. Kato;Y. Todaka
研究了HPT法制备的亚微晶纯铁的显微组织和滑动磨损性能。结果表明，高温高温热处理使纯铁的晶粒细化到亚微米量级，并且随着晶粒细化次数的增加和离中心距离的增加，高温高温热处理试样的维氏硬度也随之提高。硬度与晶粒尺寸的平方根反比成线性关系（Hall-Petch关系）。HPT工艺明显提高了合金的耐磨性，比磨损率与维氏硬度反比呈线性相关，符合Archard磨损方程。由于试样材料之间的高附着力，SUJ2球磨损试验的磨损量远高于WC-Co球磨损试验。
Microstructure and sliding wear properties of the sub-microcrystalline pure iron produced by an HPT process were investigated in detail. It was found the grains of pure iron were significantly refined to the submicron size range by an HPT process, and the Vickers hardness of HPT-processed specimens increased with increasing number of turns and distance from the center due to the grain refinement. A linear relationship between the hardness and the inverse square root of grain size (the Hall-Petch relationship) was realized. The HPT process clearly increased the wear resistance, and a linear correlation between the specific wear rate and the inverse of the Vickers hardness was found, which agreed with the Archard wear equation. The wear in SUJ2 ball wear tests was much higher than that in WC-Co ball wear tests owing to the high adhesion between the specimen materials.