Effect of Selective Laser Melting on Microstructure, Mechanical, and Corrosion Properties of Biodegradable FeMnCS for Implant Applications
Effect of Selective Laser Melting on Microstructure, Mechanical, and Corrosion Properties of Biodegradable FeMnCS for Implant Applications
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DOI：
10.1002/adem.202000182
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发表时间：
2020-04-29
影响因子：
3.6
通讯作者：
Gebert, Annett
中科院分区：
文献类型：
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作者：
Hufenbach, Julia;Sander, Jan;Gebert, Annett
可生物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的潜力。本文介绍了一种新型Fe-30 Mn-1C-0.02S孪晶诱导塑性（TSTK）合金的SLM加工及其结构、机械和腐蚀性能。采用扫描电子显微镜（SEM）、X射线能谱（EDX）、电子背散射衍射（EBSD）和X射线衍射（XRD）等分析手段，研究了快速凝固过程中合金组织中元素分布的均匀性。通过SLM处理合金，与铸态对应物和316L参考钢相比，在拉伸和压缩载荷下实现了显著更高的强度。在模拟体液（SBF）中的电化学腐蚀试验表明，中等的腐蚀活动，并在SBF中的浸泡试验中显示出有益的均匀降解。关于血管植入物的预期应用，介绍了新型合金的SLM加工支架原型，并显示了第一个功能测试。
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.