A Relationship Between Manufacturing Routes-Microstructure-Biotribology of Selective Laser Melted Stainless Steel 316L Under Dry and Simulated Body Fluid

IF 5.3 3区工程技术 Q1 ENGINEERING, MANUFACTURING

International Journal of Precision Engineering and Manufacturing-Green Technology Pub Date : 2023-12-19 DOI:10.1007/s40684-023-00578-5

Suryank Dwivedi, Amit Rai Dixit, Alok Kumar Das

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Abstract

This study aims to compare the microstructural and biotribological behavior of additively manufactured and commercially available stainless steel 316L (SS 316L) implants under simulated body fluid. The surface integrity, microstructures, and micro-hardness characterizations were performed. FESEM micrographs and 3D surface profiles dictate that the specimen is manufactured using a bi-directional 67º rot-scanning strategy. Further, the microstructure, XRD, and micro-hardness outcomes dictate that the selective laser melted (SLMed) sample has an anisotropic fine-grained (18.49 µm) gamma austenite phase with an improved hardness of 280.35HV_0.05, which is 146% higher compared to casted counterpart. In-vitro state biotribological results indicate that the SLMed part has a minimum coefficient of friction (COF: 0.287) value under simulated body fluid, which is 58% less than the casted part (COF: 0.494), and an improved volumetric wear loss at different loading conditions was also observed. The obtained outcomes dictate that selective laser melting is a better processing route to manufacture SS 316L permanent implants with enhanced microstructural, mechanical, and biotribological behavior.

Abstract Image

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干体液和模拟体液条件下选择性激光熔化不锈钢 316L 的制造工艺-微观结构-生物分布之间的关系

本研究旨在比较添加剂制造的和市售的 316L 不锈钢（SS 316L）植入体在模拟体液下的微结构和生物ribological 行为。对表面完整性、微结构和微硬度进行了表征。FESEM 显微照片和三维表面轮廓表明，试样是采用双向 67º 旋转扫描策略制造的。此外，显微结构、X射线衍射和显微硬度结果表明，选择性激光熔化（SLMed）试样具有各向异性的细晶粒（18.49微米）γ奥氏体相，硬度提高到280.35HV0.05，比铸造试样高出146%。体外生物力学结果表明，SLMed 零件在模拟体液下的摩擦系数（COF：0.287）最小，比铸造零件（COF：0.494）小 58%，而且在不同加载条件下的体积磨损也有所改善。这些结果表明，选择性激光熔化是制造 SS 316L 永久植入体的一种更好的加工方法，它能改善植入体的微观结构、机械性能和生物特征。

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来源期刊

International Journal of Precision Engineering and Manufacturing-Green Technology ENGINEERING, MANUFACTURING-ENGINEERING, MECHANICAL

CiteScore

10.30

自引率

9.50%

发文量

审稿时长

5.3 months

期刊介绍： Green Technology aspects of precision engineering and manufacturing are becoming ever more important in current and future technologies. New knowledge in this field will aid in the advancement of various technologies that are needed to gain industrial competitiveness. To this end IJPEM - Green Technology aims to disseminate relevant developments and applied research works of high quality to the international community through efficient and rapid publication. IJPEM - Green Technology covers novel research contributions in all aspects of "Green" precision engineering and manufacturing.