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首页> 外文期刊>Acta biomaterialia >Accelerated biodegradation and improved mechanical performance of pure iron through surface grain refinement
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Accelerated biodegradation and improved mechanical performance of pure iron through surface grain refinement

机译：通过表面晶粒细化加速生物降解及改善纯铁的机械性能

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Pure iron and its biocompatible and biodegradable alloys have a high potential to be used for temporary load bearing medical implants. Nevertheless, the formation of passive iron oxide and hydroxide layers, which lead to a considerably low degradation rate at the physiological environment, has highly restricted their application. Herein we used numerical and experimental methods to evaluate the effect of severe shot peening, as a scalable mechanical surface treatment, on adjusting the performance of pure iron for biomedical applications. The developed numerical model was used to identify the range of peening parameters that would promote grain refinement on the pure iron surface. Experimental tests were then performed to analyze the gradient structure and the characteristics of the interface free surface layer created on peened samples. The results indicated that severe shot peening could notably increase the surface roughness and wettability, induce remarkable surface deformation and grain refinement, enhance surface hardness and generate high in-depth compressive residual stresses. The increased surface roughness besides the high concentration of micro cracks and dislocation density in the grain refined top layer promoted pure iron's degradation in the biologically simulated environment.
机译：纯铁及其生物相容性和可生物降解的合金具有高潜力，可用于临时承载医疗植入物。尽管如此，在生理环境中形成无源氧化铁和氢氧化物层，这导致了在生理环境中具有相当低的降解速率，这极大限度地限制了它们的应用。在此，我们使用数值和实验方法来评估严重射击喷丸的效果，作为可扩展的机械表面处理，调整纯铁的生物医学应用的性能。开发的数值模型用于识别将促进纯铁表面上的晶粒细化的喷丸参数范围。然后进行实验测试以分析梯度结构和在喷丸样品上产生的界面自由表面层的特性。结果表明，严重的射击喷丸可以显着提高表面粗糙度和润湿性，诱导显着的表面变形和晶粒细化，增强表面硬度并产生高深入的压缩残余应力。除了晶粒精制顶层中高浓度的微裂纹和位错密度之外的表面粗糙度增加促进了生物模拟环境中的纯铁的降解。

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