介质参数对提高 Ti6Al4V 细喷丸硬度和残余应力能力的影响,Surfaces and Interfaces

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介质参数对提高 Ti6Al4V 细喷丸硬度和残余应力能力的影响
Surfaces and Interfaces ( IF 5.7 ) Pub Date : 2020-03-01 , DOI: 10.1016/j.surfin.2019.100424
Goratouch Ongtrakulkij , Anak Khantachawana , Katsuyoshi Kondoh

摘要大多数骨科器械由 Ti6Al4V 制成，但有大量研究表明弯曲力会导致植入物失效。精细喷丸处理是一种表面改性，可以通过增加硬度和残余压应力来提高弯曲强度，但是在此过程中使用了多种类型和尺寸的介质。因此，本研究的重点是调查二氧化硅和 SUS304 介质尺寸的影响，因为这些介质具有生物相容性。较大尺寸的SUS304介质可产生-721 MPa的残余压应力和440 HV的硬度，高于较小尺寸的-630 MPa和420 HV。由于高冲击能量，较大介质的影响也比较小介质更深，导致颗粒形状和取向发生变化。另一方面，较高硬度介质即二氧化硅能够产生比SUS304更高的残余应力和硬度最大值，分别为-729 MPa和470 HV，可以用能量转移来描述。通过 FWHM 分析和塑性变形下域尺寸的减小来讨论硬度变化的结果。此外，由于介质比基体材料更硬，EDS 对每种介质的污染可能会影响表面硬度。

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Effects of Media Parameters on Enhance Ability of Hardness and Residual Stress of Ti6Al4V by Fine Shot Peening

Abstract Most orthopedic devices are made from Ti6Al4V, but there is significant research showing that bending force can cause the failure of implants. Fine shot peening is a surface modification that can increase bending strength from the increasing of hardness and residual compressive stress, however, many kinds and sizes of media are used in this process. Therefore, this research focused on investigating the effect of media size of silica and SUS304 as these media are biocompatible. The bigger size of SUS304 media could generate -721 MPa of residual compressive stress and 440 HV of hardness that was higher than smaller media, which was -630 MPa and 420 HV. The effect of bigger media was also deeper than the smaller media because of the high impact energy, resulting in a change of grain shape and orientation. On the other hand, the higher hardness media namely silica was able to generate higher maximum value of residual stress and hardness than those of SUS304, which was -729 MPa and 470 HV respectively, and could be described by energy transfer. The result of change in hardness was discussed by the reduction of domain size under FWHM analysis and plastic deformation. Moreover, the contamination from each media by EDS could affect surface hardness as the medium is harder than based material.

更新日期：2020-03-01

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