期刊
TRIBOLOGY LETTERS
卷 32, 期 2, 页码 67-72出版社
SPRINGER/PLENUM PUBLISHERS
DOI: 10.1007/s11249-008-9361-y
关键词
Iron; Oxidative wear; Oxides; SEM; Wear mechanisms
资金
- State Key Laboratory of Materials Modification [0708]
- Jiangsu University [07JDG062]
Under atmospheric conditions at 400 C, we studied the wear mechanism of H21 steel with different tempering states as a function of normal load. Typical oxidative wear was identified by X-ray diffraction patterns with predominant tribo-oxides of Fe(3)O(4) and Fe(2)O(3). Under loads of 50-100 N, mild oxidative wear prevailed for all samples, such that the wear losses of H21 steel with various tempering states showed no significant differences with characteristics of a slight plastic deformation of the substrate and single-layer oxide. In this case, the wear rate was lower, and the tribo-oxide was decisive factor in determining wear rate. Under loads of 150-200 N, the transition of mild wear to severe wear occurred in H21 steel and was characterized by: (1) a significant difference of wear losses for steel with various tempering states; (2) wear loss that started to increase faster and reached a relatively high level; (3) the appearance of significant plastic deformation in the oxide underneath the substrate and multi-layer tribo-oxide. Under a load of 200 N for the steel tempered at 700 C, plastic extrusion prevailed with a mixed metal-oxide layer.
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