纯铁退火时的晶粒长大及其对生物降解速率的影响

Grain Growth upon Annealing and Its Influence on Biodegradation Rate for Pure Iron.

作者信息

Zhang Yu, Zhang Ke, Liu Weidong, Zheng Zhongren, Zhao Mingchun

机构信息

Xiangya Hospital, Central South University, Changsha 410008, China.

National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Changsha 410008, China.

出版信息

Materials (Basel). 2022 Nov 14;15(22):8030. doi: 10.3390/ma15228030.

DOI:10.3390/ma15228030

PMID:36431520

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9692834/

Abstract

Biodegradable pure iron has gained significant interest as a biomedical material. For biodegradable implant applications, the biodegradation behavior of pure iron is important. In this work, the influence of ferrite grain size on the biodegradation rate for pure iron was studied by means of heat treatment that was annealed below the austenized temperature using as-forged pure iron. Grains were coarsened and a spectrum of ferrite grain sizes was gained by changing the annealed temperature. Biodegradation behavior was studied through weight loss tests, electrochemical measurements and microscopic analyses. Hardness (HV) and biodegradation rate ( or ) were linearly ferrite grain size-dependent: HV=58.9+383.2d-12, and Pi=-0.023+0.425d-12 or Pw=0.056+0.631d-12. The mechanism by which the role of grain size on biodegradation rate was attributed to the ferrite grain boundary traits.

摘要

可生物降解纯铁作为一种生物医学材料已引起广泛关注。对于可生物降解植入物应用而言，纯铁的生物降解行为至关重要。在本研究中，以锻造态纯铁为原料，通过在低于奥氏体化温度下进行退火处理的热处理方法，研究了铁素体晶粒尺寸对纯铁生物降解速率的影响。通过改变退火温度使晶粒粗化，从而获得了一系列铁素体晶粒尺寸。通过失重试验、电化学测量和微观分析对生物降解行为进行了研究。硬度（HV）和生物降解速率（或）与铁素体晶粒尺寸呈线性关系：HV = 58.9 + 383.2d - 12，Pi = -0.023 + 0.425d - 12或Pw = 0.056 + 0.631d - 12。晶粒尺寸对生物降解速率的影响机制归因于铁素体晶界特性。