Metallurgical Aspects of Sliding Wear of fcc Materials for Medical Applications
Metallurgical Aspects of Sliding Wear of fcc Materials for Medical Applications
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DOI：
10.1002/mawe.200300680
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发表时间：
2003-10
影响因子：
1.1
通讯作者：
R. Büscher;A. Fischer
中科院分区：
文献类型：
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作者：
R. Büscher;A. Fischer
通过滑动磨损产生生物医学面心立方合金X2 CrNiMo 18 - 15 - 3、CoCr 29 Mo 6、X13 CrMnMoN 18 - 14 - 3的磨损表面，以了解产生小磨损颗粒的机制。根据磨损机制的不同，磨屑产生于不同的裂纹萌生位置和裂纹扩展路径。因此，地下变形机制进行了研究。这项调查表明，所有三种材料的磨损表面组成的纳米晶层下的循环变形的外观是可见的。关于堆垛层错能，X13 CrMnMoN 18 - 14 - 3以及CoCr 29 Mo 6描述了滑动带、堆垛层错和应变诱导ε-马氏体，从而为纳米晶层带来足够的支撑。因此，80至500 nm的细小球状和片状磨损颗粒正好从该层上撕下。与此相反，X2 CrNiMo 18 - 15 - 3显示出磨损表面下方约50 μm处的细胞壁，这是裂纹萌生和扩展的位置。平均磨粒直径约为20 ~ 250 μm，比基体大一个数量级。由于纳米晶层不受下面的材料支撑，因此对磨损率没有明显的积极影响。
Worn surfaces of biomedical fcc alloys X2CrNiMo18‐15‐3, CoCr29Mo6, X13CrMnMoN18‐14‐3 are generated by sliding wear in order to understand the mechanisms, which bring about small wear particles. Depending on the acting wear mechanisms the debris is produced by different sites of crack initiation and paths of crack propagation. Thus, the subsurface deformation mechanisms are investigated as well. This investigation revealed that the worn surfaces of all three materials consist of a nanocrystalline layer underneath which appearances of cyclic deformation are visible. With respect to the stacking fault energy X13CrMnMoN18‐14‐3 as well as the CoCr29Mo6 depict sliding bands, stacking faults, and strain induced ε‐martensite bringing about a sufficient support of the nanocrystalline layer. Thus, 80 to 500 nm fine globular and lamellar wear particles are just torn off this layer. In contrast to this, X2CrNiMo18‐15‐3 shows cell walls in distances of about 50 μm below the worn surfaces, which act as sites for crack initiation and propagation. The mean wear particles are about an order of magnitude bigger and range from 20 to 250 μm. Due to the fact that the nanocrystalline layer is not supported by the material underneath it has no distinct positive effect on the wear rate.