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首页> 外文期刊>Materials science & engineering >Uneven damage on head and liner contact surfaces of a retrieved Co-Cr-based metal-on-metal hip joint bearing: An important reason for the high failure rate
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Uneven damage on head and liner contact surfaces of a retrieved Co-Cr-based metal-on-metal hip joint bearing: An important reason for the high failure rate

机译：回收的Co-Cr基金属对金属髋关节轴承的头部和衬里接触表面的不均匀损坏：高故障率的重要原因

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摘要

Detailed metallurgical investigations have been performed on a used Co-Cr-based metal-on-metal (MoM) hip joint bearing containing a type of liner that is commonly used in such joints. The damage on the metal-liner sliding surface was considerably more severe than that on the metal head counterpart in terms of wear-scar density and width and microcrack frequency. Cross-sectional transmission electron microscopy revealed that a thick (＞3 μm) nanocrystalline layer formed on the sliding surface of the head, whereas the liner had coarse carbides embedded in it and nanocrystals were formed in a very limited region no deeper than 1 μm. Comparative investigation of an unused head and a liner of identical type showed that although the chemical compositions of the liner and head were nearly identical, their microstructures were significantly different. Specifically, the grain size in the liner was larger than that in the head on average, and the grain boundaries of the liner were decorated with coarse carbides. Moreover, X-ray diffraction analysis revealed a large tensile residual stress only in the liner. These differences are possibly responsible for the wear damage on the liner being more serious than that on the head.
机译：已对使用过的Co-Cr基金属对金属（MoM）髋关节轴承进行了详细的冶金研究，该轴承包含一种通常用于此类接头的衬套。就磨损痕迹密度，宽度和微裂纹频率而言，对金属衬里滑动表面的破坏比对金属头滑动表面的破坏严重得多。横截面透射电子显微镜显示，在头部的滑动表面上形成了厚的（> 3μm）纳米晶体层，而衬管中嵌入了粗大的碳化物，并且在不超过1μm的非常有限的区域内形成了纳米晶体。对未使用的头部和相同类型的衬管的比较研究表明，尽管衬管和头部的化学成分几乎相同，但它们的微观结构却有很大不同。具体地，衬里的晶粒尺寸平均大于头部的晶粒尺寸，并且衬里的晶界被粗碳化物装饰。而且，X射线衍射分析显示仅在衬里中有大的拉伸残余应力。这些差异可能导致衬套的磨损损坏比头部磨损严重。

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  • 来源
    《Materials science & engineering》 |2016年第5期|532-543|共12页
  • 作者

    Yuichiro Koizumi; Yan Chen; Yunping Li; Kenta Yamanaka; Akihiko Chiba; Shun-Ichiro Tanaka; Yoshihiro Hagiwara;

  • 作者单位

    Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, Miyagi 980-8577, Japan;

    Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, Miyagi 980-8577, Japan;

    Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, Miyagi 980-8577, Japan;

    Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, Miyagi 980-8577, Japan;

    Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, Miyagi 980-8577, Japan;

    Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Katahira 2-1-1, Aoba-ku, Sendai 980-8577, Japan;

    Tohoku University School of Medicine, 2-1 Seiryo-machi, Aoba-ku, Sendai, Miyagi 980-8575, Japan;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Co-Cr alloy; Hip prosthesis; Chemical composition; Surface analysis;

    机译：钴铬合金髋关节假体;化学成分;表面分析;

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