Fatigue Life and Residual Stress of Flat Stainless Steel Specimens Laser-Cladded with a Cobalt-Based Alloy and Postprocessed with Laser Shock Peening

IF 4.7 3区材料科学 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC ACS Applied Electronic Materials Pub Date : 2024-02-28 DOI:10.3390/jmmp8020045

Santiago Flores-García, C. E. Martínez-Pérez, C. Rubio-González, J. A. Banderas-Hernández, C. Félix-Martínez, Salomón M. A. Jiménez

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Abstract

Laser cladding (LC) is a versatile additive manufacturing process where strands of metallic material are deposited and melted by a laser. However, there are some limitations associated with this process that may affect the performance of the final manufactured parts. In the present work, the influence of laser shock peening (LSP) on the fatigue life of 304 stainless steel flat specimens with a cobalt-based alloy (Stellite 6) coating applied by LC was investigated. The analysis was carried out both experimentally and numerically. In the LSP simulation, the ABAQUS/Explicit code was used to determine the residual stress distribution of specimens with double central notches with a radius of curvature of 5, 10, 15, and 20 mm. From the numerical results, an improvement was found regarding fatigue life up to 48% in samples with LSP. Experimentally, 14% in fatigue life enhancement was observed. The residual stress, determined by the contour method, showed good agreement with the LSP simulation. The SEM images revealed that the fatigue failure started at the Stellite 6 coating and propagated towards the center of the specimen. LSP has been shown to be a suitable postprocessing alternative for laser-cladded parts that will be subjected to fatigue loading since it led to fatigue improvement through the introduction of compressive residual stresses on clad coatings.

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激光填充钴基合金并进行激光冲击强化后处理的扁平不锈钢试样的疲劳寿命和残余应力

激光熔覆（LC）是一种多功能增材制造工艺，通过激光沉积和熔化金属材料股。然而，这种工艺存在一些局限性，可能会影响最终制件的性能。在本研究中，研究了激光冲击强化（LSP）对 304 不锈钢扁平试样疲劳寿命的影响，该试样通过 LC 涂覆了钴基合金（Stellite 6）涂层。分析同时通过实验和数值方法进行。在 LSP 模拟中，使用 ABAQUS/Explicit 代码确定了曲率半径为 5、10、15 和 20 毫米的双中心凹槽试样的残余应力分布。数值结果表明，带有 LSP 的试样的疲劳寿命提高了 48%。实验结果表明，疲劳寿命提高了 14%。用等值线法测定的残余应力与 LSP 模拟结果一致。扫描电子显微镜图像显示，疲劳破坏始于 Stellite 6 涂层，并向试样中心扩展。LSP 已被证明是激光熔覆零件承受疲劳载荷的一种合适的后处理替代方法，因为它通过在熔覆涂层上引入压缩残余应力来改善疲劳状况。

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来源期刊

ACS Applied Electronic Materials Multiple-

CiteScore

7.20

自引率

4.30%

发文量

567

期刊介绍： ACS Applied Electronic Materials is an interdisciplinary journal publishing original research covering all aspects of electronic materials. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrate knowledge in the areas of materials science, engineering, optics, physics, and chemistry into important applications of electronic materials. Sample research topics that span the journal's scope are inorganic, organic, ionic and polymeric materials with properties that include conducting, semiconducting, superconducting, insulating, dielectric, magnetic, optoelectronic, piezoelectric, ferroelectric and thermoelectric. Indexed/Abstracted： Web of Science SCIE Scopus CAS INSPEC Portico

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