Analysing the Impact of Severe Shot Peening on the Fatigue Strength of Wire Arc Additively Manufactured Carbon Steel

Key Engineering Materials Pub Date : 2024-07-03 DOI:10.4028/p-6wFg7e

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

{"title":"Analysing the Impact of Severe Shot Peening on the Fatigue Strength of Wire Arc Additively Manufactured Carbon Steel","authors":"M. Hietala, T. Rautio, M. Keskitalo, M. Jaskari, A. Järvenpää","doi":"10.4028/p-6wFg7e","DOIUrl":null,"url":null,"abstract":"The study investigates the impact of severe shot peening on the fatigue strength of wire arc additively manufactured carbon steel. Initial characterization revealed a material with prominent equiaxed grains and large grain sizes. However, the application of SSP induced a considerable reduction in grain size, particularly on the surface, consequently enhancing the surface's strength and hardness, yet leading to an inhomogeneous structure within the WAAM CS SSP part. Hardness measurements demonstrated a substantial impact on surface hardness, reaching a depth of approximately 0.4 mm, with a 64% increase observed due to SSP, elevating it from an average of 165 HV to a maximum of 270 HV near the surface. Tensile tests on WAAM CS and WAAM CS SSP displayed notable improvements in mechanical properties following SSP treatment. Yield strength increased by approximately 5%, and ultimate tensile strength rose by 2.5%, resulting in a peak tensile strength of 513 MPa. However, this enhancement was accompanied by reduced ductility, evidenced by decreased elongation from 44% in WAAM CS to 35% in WAAM CS SSP. Bending fatigue tests highlighted a significant enhancement in fatigue resistance due to SSP treatment. The fatigue limit increased by 21% from 190 MPa for WAAM CS to 230 MPa for WAAM CS SSP, indicating improved resistance in both low-cycle and high-cycle fatigue regimes. This enhancement in fatigue resistance is attributed to the heightened mechanical strength post-SSP treatment, suggesting a trade-off between increased strength and reduced ductility. The results demonstrate that SSP significantly enhances surface attributes, strength, and fatigue resistance of WAAM CS. This advancement bears implications for engineering applications where enhanced mechanical properties and fatigue resistance are vital, despite the induced trade-offs in material characteristics.","PeriodicalId":17714,"journal":{"name":"Key Engineering Materials","volume":"28 s81","pages":"15 - 20"},"PeriodicalIF":0.0000,"publicationDate":"2024-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Key Engineering Materials","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.4028/p-6wFg7e","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}

引用次数: 0

Abstract

The study investigates the impact of severe shot peening on the fatigue strength of wire arc additively manufactured carbon steel. Initial characterization revealed a material with prominent equiaxed grains and large grain sizes. However, the application of SSP induced a considerable reduction in grain size, particularly on the surface, consequently enhancing the surface's strength and hardness, yet leading to an inhomogeneous structure within the WAAM CS SSP part. Hardness measurements demonstrated a substantial impact on surface hardness, reaching a depth of approximately 0.4 mm, with a 64% increase observed due to SSP, elevating it from an average of 165 HV to a maximum of 270 HV near the surface. Tensile tests on WAAM CS and WAAM CS SSP displayed notable improvements in mechanical properties following SSP treatment. Yield strength increased by approximately 5%, and ultimate tensile strength rose by 2.5%, resulting in a peak tensile strength of 513 MPa. However, this enhancement was accompanied by reduced ductility, evidenced by decreased elongation from 44% in WAAM CS to 35% in WAAM CS SSP. Bending fatigue tests highlighted a significant enhancement in fatigue resistance due to SSP treatment. The fatigue limit increased by 21% from 190 MPa for WAAM CS to 230 MPa for WAAM CS SSP, indicating improved resistance in both low-cycle and high-cycle fatigue regimes. This enhancement in fatigue resistance is attributed to the heightened mechanical strength post-SSP treatment, suggesting a trade-off between increased strength and reduced ductility. The results demonstrate that SSP significantly enhances surface attributes, strength, and fatigue resistance of WAAM CS. This advancement bears implications for engineering applications where enhanced mechanical properties and fatigue resistance are vital, despite the induced trade-offs in material characteristics.

查看原文本刊更多论文

分析严重喷丸强化对线弧叠加制造碳钢疲劳强度的影响

该研究调查了严重喷丸强化对线弧快速成型碳钢疲劳强度的影响。初步表征显示，该材料具有突出的等轴晶粒和较大的晶粒尺寸。然而，SSP 的应用导致晶粒尺寸显著减小，尤其是在表面，从而提高了表面强度和硬度，但也导致 WAAM CS SSP 零件内部结构不均匀。硬度测量结果表明，SSP 对表面硬度产生了重大影响，影响深度约为 0.4 毫米，增加了 64%，使表面附近的平均硬度从 165 HV 提高到最高 270 HV。对 WAAM CS 和 WAAM CS SSP 的拉伸测试表明，SSP 处理后的机械性能显著提高。屈服强度提高了约 5%，极限拉伸强度提高了 2.5%，峰值拉伸强度达到 513 兆帕。然而，这种提高伴随着延展性的降低，表现为伸长率从 WAAM CS 的 44% 降至 WAAM CS SSP 的 35%。弯曲疲劳试验表明，SSP 处理显著提高了抗疲劳性。疲劳极限提高了 21%，从 WAAM CS 的 190 兆帕提高到 WAAM CS SSP 的 230 兆帕，表明在低循环和高循环疲劳状态下的抗疲劳性都有所提高。抗疲劳性能的提高归因于 SSP 处理后机械强度的提高，这表明在强度提高和延展性降低之间存在权衡。结果表明，SSP 能显著增强 WAAM CS 的表面属性、强度和抗疲劳性。这一进步对工程应用具有重要意义，因为在工程应用中，尽管材料特性会产生权衡，但增强机械性能和抗疲劳性是至关重要的。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Key Engineering Materials

CiteScore

1.00

自引率

0.00%

发文量