Microstructure and surface quality of SLM printed miniature helical gear in LSPwC

IF 2.4 4区材料科学 Q3 MATERIALS SCIENCE, COATINGS & FILMS

Surface Engineering Pub Date : 2023-02-01 DOI:10.1080/02670844.2023.2207934

S. Pathak, Marek Böhm, J. Kaufman, J. Kopeček, S. Zulić, Ondřej Stránský, J. Brajer, L. Beránek, T. Mocek

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Abstract

ABSTRACT The present work describes the influence of underwater laser shock peening without coating (LSPwC) on selective laser melting manufactured meso-size (outside diameter ≤ 10 mm) helical gears. Five experiments were conducted using energies in the 200 mJ up to 1 J, while the spot size and overlap were kept constant as 1 mm and 90 %, respectively. Responses were measured and compared in terms of surface residual stresses, surface roughness, and microstructure of LSPwC-treated samples. Results show the development of significant compressive residual stresses in the root of the LSPwC processed helical gear, where it changes the state from tensile +45 MPa to compressive −421 MPa. Surface roughness has shown improvement, while volumetric material peak confirms the reduction by over 50%. Microstructure study was performed at the surface and by cross-section using scanning electron microscopy and electron backscatter diffraction analysis. The grain refinement and change in misorientation were observed, confirming plastic deformation.

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LSPwC中SLM印刷微型斜齿轮的微观结构和表面质量

摘要本文研究了无涂层水下激光冲击强化(LSPwC)对选择性激光熔化制造的中尺寸(外径≤10 mm)斜齿轮的影响。在200mj ~ 1j的能量范围内进行了5次实验，光斑尺寸和重叠度分别保持在1mm和90%。对lspwc处理样品的表面残余应力、表面粗糙度和微观结构进行了测量和比较。结果表明，LSPwC加工斜齿轮根部存在明显的残余压应力，从拉伸+45 MPa转变为压缩- 421 MPa。表面粗糙度有所改善，而体积材料峰值证实减少了50%以上。利用扫描电镜和电子背散射衍射分析对表面和横截面进行了微观结构研究。观察到晶粒细化和取向偏差的变化，证实了塑性变形。

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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来源期刊

Surface Engineering 工程技术-材料科学：膜

CiteScore

5.60

自引率

14.30%

发文量

审稿时长

2.3 months

期刊介绍： Surface Engineering provides a forum for the publication of refereed material on both the theory and practice of this important enabling technology, embracing science, technology and engineering. Coverage includes design, surface modification technologies and process control, and the characterisation and properties of the final system or component, including quality control and non-destructive examination.