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首页> 外文期刊>Proceedings of the Institution of Mechanical Engineers, Part H. Journal of Engineering in Medicine >Parametric optimization of deep cryogenic treatment for the wear response of implant material UNS R56700: Taguchi's approach
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Parametric optimization of deep cryogenic treatment for the wear response of implant material UNS R56700: Taguchi's approach

机译：植入物材料磨损效应的深层低温处理的参数优化Unt R56700：Taguchi的方法

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Using the Taguchi's robust design of experiments methodology, this article presents the systematic identification and optimization of most influential parameters of deep cryogenic treatment process to minimize the specific wear rate of UNS R56700 (Ti6Al7Nb). In addition to the different soaking durations (0-96 h) at 77 K and different tempering temperatures (room temperature, 403-523 K), three commonly used variables of pin-on-disk test, namely, sliding speed (1.047-2.723 ms(-1)), contact pressure (0.641-1.282 MPa), and sliding time (600-2280 s) were chosen to conduct the tests. During dry sliding conditions, pin-on-disk tribo-tests were performed to slide Ti6Al7Nb on the surface of UNS 52986 (En31) material as per standardized ASTM G99 guidelines. Experimentally measured wear rate values were converted to signal-noise ratio to statistically analyze the influence of five control variables using pooled analysis of variance and F-test. Statistically found influential control variables are confirmed experimentally. The results show that sliding speed, contact pressure and soaking duration are the most significant factors influencing the wear rate. In contrast, the parameters, that is, tempering temperature and sliding time, exhibit a lower level of influence. Microstructural characterizations done using optical microscopy, scanning electron microscopy, energy-dispersive X-ray spectroscopy, and X-ray diffraction techniques suggested that deep cryogenic treatment favors the refinement of grain size of present phases with reduction in beta-stabilization (beta-phase) in Ti6Al7Nb. The possible reasons for the improvement in wear rate of Ti6Al7Nb underlying the morphological alterations have been explained.
机译：使用Taguchi的实验方法方法方法，本文提出了系统识别和优化深层低温处理过程的大多数影响力，以最大限度地减少UNS R56700（Ti6Al7NB）的特定磨损率。除了在77 k和不同的回火温度（室温，403-523 k）时不同的浸泡持续时间（0-96小时），还有三种常用的销钉测试变量，即滑动速度（1.047-2.723 MS（-1）），接触压力（0.641-1.282MPa），并选择滑动时间（600-2280秒）进行测试。在干燥滑动条件下，根据标准化ASTM G99指南，在UNS 52986（EN31）材料表面上进行销上磁盘摩擦试验，在UNS 52986（EN31）材料的表面上进行滑动Ti6Al7NB。实验测量的磨损率值被转换为信噪比，以统计使用汇总的方差分析和F检验来分析五种控制变量的影响。统计上发现的影响力控制变量通过实验确认。结果表明，滑动速度，接触压力和浸泡持续时间是影响磨损率的最重要因素。相反，参数，即回火温度和滑动时间，表现出较低水平的影响。使用光学显微镜，扫描电子显微镜，能量分散X射线光谱和X射线衍射技术进行的微观结构表征表明，深浊度处理有利于随着β稳定的还原（β相）的晶粒尺寸的改进在Ti6al7nb中。已经解释了潜在的形态改变的Ti6Al7nb磨损率提高的可能原因。

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