A Comparison Study of Wear and Fretting Fatigue Behavior Between Cr-alloyed Layer and Cr–Ti Solid-solution Layer
A Comparison Study of Wear and Fretting Fatigue Behavior Between Cr-alloyed Layer and Cr–Ti Solid-solution Layer
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DOI：
10.1007/s40195-016-0449-3
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发表时间：
2016-08
期刊：
影响因子：
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通讯作者：
Shouming Yu;Daoxin Liu;Xiao-hua Zhang;Cheng-song Liu
中科院分区：
文献类型：
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作者：
Shouming Yu;Daoxin Liu;Xiao-hua Zhang;Cheng-song Liu
比较了铬合金化层和铬钛固溶体层的磨损和微动疲劳行为。评价两层的硬度和韧性以支持该比较。结果表明，铬合金化层表面硬度高，但韧性差，铬钛固溶体层韧性好，但硬度低。改性Ti6 Al 4V合金的摩擦磨损性能取决于两个因素之间的权衡：耐磨性和疲劳抗力。虽然铬合金层能有效地抵抗微动区的磨损，但其韧性较差，导致疲劳抗力急剧下降，从而导致FF试验中的过早失效。由于Cr-Ti固溶体层具有较好的抗疲劳性能，其FF寿命略高于Cr合金层，但其硬度较低，导致与微动区域对应的严重磨损，从而未能改善Ti6 Al 4V合金的FF性能。当与喷丸后处理相结合时，与Ti6 Al 4V合金相比，两层的FF寿命增加约三倍。进一步的研究表明，低韧性或低硬度仍然对复合处理的样品产生负面影响。
This work reported a comparison between the wear and fretting fatigue (FF) behaviors of a Cr-alloyed layer and a Cr–Ti solid-solution layer. The hardness and toughness of both layers were evaluated to support this comparison. The results showed that the Cr-alloyed layer had high surface hardness but poor toughness, while the Cr–Ti solid-solution layer had excellent toughness but low hardness. The FF properties of the modified Ti6Al4V alloy depended on the trade-off between two factors: wear resistance and fatigue resistance. Although the Cr-alloyed layer could effectively resist the wear in fretting areas, its poor toughness caused the fatigue resistance to drop sharply and hence led to a premature failure in FF test. Due to the relatively good fatigue resistance, the Cr–Ti solid-solution layer had slightly higher FF life than that of the Cr-alloyed layer; however, its low hardness resulted in severe wear in correspondence with the fretting area and thus a failure to improve the FF properties of Ti6Al4V alloy. When combined with shot peening post-treatment, the FF life of both layers increased by about three times compared to that of the Ti6Al4V alloy. A further study showed that the poor toughness or low hardness still exerted negative influence on combination-treated samples.