Grain Growth upon Annealing and Its Influence on Biodegradation Rate for Pure Iron期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

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

Authors:	Yu Zhang Ke Zhang Weidong Liu Zhongren Zheng Mingchun Zhao

Affiliation:	1.Xiangya Hospital, Central South University, Changsha 410008, China;2.National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Changsha 410008, China;3.International Joint Research Center of Minimally Invasive Endoscopic Technology Equipment & Standards, Changsha 410008, China;4.School of Materials Science and Engineering, Central South University, Changsha 410083, China

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 (P_i or P_w) were linearly ferrite grain size-dependent: $HV = 58.9 + 383.2 d^{- \frac{1}{2}}$ , and $P_{i} = - 0.023 + 0.425 d^{-}^{\frac{1}{2}}$ or $P_{w} = 0.056 + 0.631 d^{-}^{\frac{1}{2}}$ . The mechanism by which the role of grain size on biodegradation rate was attributed to the ferrite grain boundary traits.

Keywords:	pure iron annealing grain refinement biodegradation implant material

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