Effect of Selective Laser Melting on Microstructure, Mechanical, and Corrosion Properties of Biodegradable FeMnCS for Implant Applications,Advanced Engineering Materials

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Effect of Selective Laser Melting on Microstructure, Mechanical, and Corrosion Properties of Biodegradable FeMnCS for Implant Applications
Advanced Engineering Materials ( IF 3.4 ) Pub Date : 2020-04-01 , DOI: 10.1002/adem.202000182
Julia Hufenbach _{1,

2} , Jan Sander ₁ , Fabian Kochta ₁ , Stefan Pilz ₁ , Andrea Voss ₁ , Uta Kühn ₁ , Annett Gebert ₁

Affiliation

Selective laser melting (SLM) of biodegradable metallic materials offers a great potential for manufacturing customized implants. Herein, SLM processing of a novel Fe–30Mn–1C–0.02S twinning‐induced plasticity (TWIP) alloy and the resulting structural, mechanical, and corrosion properties are presented. The occurring rapid solidification results in a fine‐grained austenitic microstructure with mainly homogeneous element distribution, which is investigated by scanning electron microscopy (SEM) combined with energy‐dispersive X‐ray spectroscopy (EDX) and electron backscatter diffraction (EBSD) as well as X‐ray diffraction (XRD). By processing the alloy via SLM, significantly higher strengths under tensile and compressive load in comparison with those for the as‐cast counterpart and a 316L reference steel are achieved. Electrochemical corrosion tests in a simulated body fluid (SBF) indicate a moderate corrosion activity, and a beneficial uniform degradation is shown in immersion tests in SBF. Regarding the envisaged application for vascular implants, SLM‐processed stent prototypes out of the novel alloy are presented and a first functionality test is shown.

中文翻译：

选择性激光熔化对可植入植入生物可降解FeMnCS的组织，力学和腐蚀性能的影响

生物可降解金属材料的选择性激光熔化（SLM）为制造定制植入物提供了巨大潜力。本文介绍了一种新型的Fe–30Mn–1C–0.02S孪生诱导可塑性（TWIP）合金的SLM工艺及其所产生的结构，机械和腐蚀性能。发生的快速凝固形成了具有主要均匀元素分布的细晶粒奥氏体组织，通过扫描电子显微镜（SEM）结合能量色散X射线光谱（EDX）和电子背散射衍射（EBSD）进行了研究X射线衍射（XRD）。通过SLM加工合金，与铸态对应物和316L参比钢相比，在拉伸和压缩载荷下的强度明显提高。在模拟体液（SBF）中进行的电化学腐蚀测试显示出中等的腐蚀活性，并且在SBF中的浸没测试中显示出有益的均匀降解。关于血管植入物的预期应用，介绍了由新型合金制成的经SLM处理的支架原型，并显示了第一个功能测试。

更新日期：2020-04-01

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