Fatigue and Corrosion Evaluation of L-PBF 316L Stainless Steel Having Undergone a Self-Terminating Etching Process for Surface Finish Improvement.

IF 4.7 Q2 MATERIALS SCIENCE, BIOMATERIALS ACS Applied Bio Materials Pub Date : 2024-08-20 eCollection Date: 2024-08-01 DOI:10.1089/3dp.2022.0346

Stephanie Prochaska, Subbarao Raikar, Owen Hildreth

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Abstract

The poor surface finish of as-printed (AP) laser powder bed fusion (L-PBF) 316L stainless steels has detrimental impacts on the resulting fatigue and corrosion performance. One postprocessing method, a self-terminating etching process (STEP), can improve the surface finish of parts up to 76%, but the resulting effects on fatigue life and corrosion reliability remain unknown. This work evaluates the effect of the STEP on the fatigue and corrosion performance of L-PBF 316L. In addition, to determine the influence of changing the microstructures from the as-built condition, specimens having undergone a pre-STEP stress relief (SR + STEP) heat treatment and a pre-STEP solution anneal (SA + STEP) were evaluated. The results showed that a pre-STEP SR resulted in the best Sa roughness, while a pre-STEP SA had the biggest improvement in Sv roughness. Despite Sv roughness being a major indicator of fatigue performance, the coarse grains and internal porosity in the SA specimens resulted in the poorest fatigue performance. The SR + STEP specimens' fatigue lives were 10 × higher than the AP samples under a load of 275 MPa and 2-3 × higher under a 350 MPa load. The SR + STEP specimen also had the best corrosion performance in a sodium chloride electrolyte due to the smoother surface and least remnant surface carbides.

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L-PBF 316L不锈钢经自终止蚀刻工艺改善表面光洁度的疲劳和腐蚀评价

激光粉末床熔融（L-PBF）316L 不锈钢的表面光洁度较差，对其疲劳和腐蚀性能有不利影响。一种后处理方法--自终止蚀刻工艺（STEP）可将零件的表面光洁度提高 76%，但其对疲劳寿命和腐蚀可靠性的影响仍然未知。本研究评估了 STEP 对 L-PBF 316L 的疲劳和腐蚀性能的影响。此外，为了确定改变微观结构对竣工状态的影响，还对经过预 STEP 去应力（SR + STEP）热处理和预 STEP 固溶退火（SA + STEP）的试样进行了评估。结果表明，预 STEP SR 的 Sa 粗糙度最好，而预 STEP SA 对 Sv 粗糙度的改善最大。尽管 Sv 粗糙度是疲劳性能的主要指标，但 SA 试样中的粗晶粒和内部孔隙率导致其疲劳性能最差。SR + STEP 试样在 275 兆帕载荷下的疲劳寿命比 AP 试样高 10 倍，在 350 兆帕载荷下高 2-3 倍。在氯化钠电解液中，SR + STEP 试样的腐蚀性能也是最好的，因为其表面更光滑，残留的表面碳化物最少。

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来源期刊

ACS Applied Bio Materials Chemistry-Chemistry (all)

CiteScore

9.40

自引率

2.10%

发文量

464

期刊介绍： ACS Applied Bio Materials is an interdisciplinary journal publishing original research covering all aspects of biomaterials and biointerfaces including and beyond the traditional biosensing, biomedical and therapeutic applications. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrates knowledge in the areas of materials, engineering, physics, bioscience, and chemistry into important bio applications. The journal is specifically interested in work that addresses the relationship between structure and function and assesses the stability and degradation of materials under relevant environmental and biological conditions.