Fatigue Resistance Assessment of WAAM Carbon Steel

Key Engineering Materials Pub Date : 2024-02-23 DOI:10.4028/p-c3fgtr

M. Hietala, T. Rautio, M. Jaskari, M. Keskitalo, A. Järvenpää

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Abstract

This study presents a comprehensive exploration of the fatigue resistance of wire arc additive manufacturing (WAAM) carbon steel for lattice structures. Microstructural analysis unveils substantial grain dimensions characterized by a distinctive crystallographic configuration. These grains exhibit equiaxed characteristics, demonstrating uniform dimensions in all directions. The prevailing microstructure is dominated by ferrite grains. In tandem with the microstructural insights, hardness evaluations were conducted in correspondence with the part's deposition direction. The analysis of these measurements unveiled a consistent base material hardness of approximately 159 HV. The uniform distribution of hardness profiles supports the deduction that WAAM carbon steel uniformly embodies strength attributes. This congruence aligns harmoniously with the uniform microstructure evident in microscopic analyses. The yield strength of the WAAM carbon steel exhibits higher values in the build direction, peaking at 392 MPa. The bending fatigue tests revealed a fatigue limit approximating 180 MPa for WAAM carbon steel, evident in both the build and deposition directions. Fatigue strength of WAAM carbon steel mirrors that observed for reference material S355MC steel sheet.

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WAAM 碳钢的抗疲劳性评估

本研究全面探讨了线弧快速成型（WAAM）碳钢晶格结构的抗疲劳性。微结构分析揭示了以独特结晶构造为特征的大量晶粒尺寸。这些晶粒表现出等轴特性，在各个方向上尺寸均匀一致。主要的微观结构以铁素体晶粒为主。在深入了解微观结构的同时，还根据零件的沉积方向进行了硬度评估。对这些测量结果的分析表明，基础材料的硬度大约为 159 HV。硬度曲线的均匀分布支持了 WAAM 碳钢均匀体现强度属性的推论。这种一致性与显微分析中明显的均匀微观结构和谐一致。WAAM 碳钢的屈服强度在构建方向上显示出更高的值，峰值为 392 兆帕。弯曲疲劳测试表明，WAAM 碳钢的疲劳极限接近 180 兆帕，这在构建方向和沉积方向都很明显。WAAM 碳钢的疲劳强度与参考材料 S355MC 钢板的疲劳强度相同。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Key Engineering Materials

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