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首页> 外文期刊>Proceedings of the Institution of Mechanical Engineers, Part H. Journal of Engineering in Medicine >'Severe' wear challenge to 'as-cast' and 'double heat-treated' large-diameter metal-on-metal hip bearings
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'Severe' wear challenge to 'as-cast' and 'double heat-treated' large-diameter metal-on-metal hip bearings

机译：“铸造”和“双重热处理”大直径金属对金属髋关节轴承面临“严重”磨损挑战

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摘要

The wear generation of double-heat-treated and as-cast large-diameter metal-on-metal (MOM) hip bearings was investigated using standard- and 'severe'-gait simulations. The test hypothesis was that double heat treatment would change MOM hip wear compared with the as-cast condition. Two groups of high-carbon MOM bearings of 40 mm diameter were manufactured and subjected to either hot isostatic pressing (HIP) and solution annealing (SA) or no heat treatment (as cast). The results showed no statistical difference between the two groups under both running-in and steady state conditions. Even under the most 'severe'-gait simulation published to date, the mean volumetric wear rates were 2.9 and 3.9 mm{sup}3 per 10{sup}6 cycles for the HIP-SA and as-cast bearings respectively, showing a ten-fold increase in wear compared with walking. These differences were not statistically different; therefore our hypothesis was negated. Changes in alloy microstructure do not appear to influence the wear behaviour of high-carbon cast MOM articulations with similar chemical compositions. This is in sharp contrast with the published significance of bearing diameter and radial clearance on the wear of MOM hip bearings.
机译：使用标准步态和“严重”步态模拟研究了双热处理和铸态大直径金属对金属（MOM）髋关节轴承的磨损产生。测试假设是，与铸态相比，双重热处理会改变MOM髋关节的磨损。制造了两组直径为40 mm的高碳MOM轴承，并对其进行了热等静压（HIP）和固溶退火（SA）或不进行热处理（铸造）。结果表明，在磨合和稳态条件下，两组之间均无统计学差异。即使在迄今为止发布的最“严峻”的步态模拟下，HIP-SA和铸态轴承的平均体积磨损率也分别为每10 {sup} 6个循环2.9和3.9 mm {sup} 3，与步行相比，磨损增加了两倍。这些差异在统计学上没有差异;因此我们的假设被否定了。合金微观结构的变化似乎不会影响具有相似化学成分的高碳铸造MOM接头的磨损行为。这与已发表的轴承直径和径向游隙对MOM髋关节轴承的磨损形成了鲜明的对比。

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