Laser shock peening as a post-processing technique for Inconel 718 components manufactured by laser powder bed fusion

IF 2.9 3区 工程技术 Q2 AUTOMATION & CONTROL SYSTEMS
J. Antonio Banderas-Hernández, Carlos Rubio-González, Arturo Gómez-Ortega, Santiago Flores-García, Carlos Elí Martínez-Pérez
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Abstract

Additive manufacturing (AM) has shown advantages to fabricate complex components in an efficient way. However, it has some limitations related to imperfections on the as-built parts that may limit its mechanical behavior and performance. The aim of this paper is to investigate the effect of laser shock peening (LSP) as a post-processing technique of components produced by AM. Porosity, microstructure, residual stresses, and fatigue life of Inconel 718 samples manufactured by laser powder bed fusion (LPBF) and then treated by LSP have been evaluated. For the laser shock peening (LSP) treatment, a Nd:YAG pulsed laser operating at 10 Hz with 1064 nm of wavelength was used; pulse density was 2500 pulses/cm2. The LSP setup was the waterjet arrangement without protective coating. Residual stress distribution as a function of depth was determined by the hole-drilling method. Fatigue specimens were LSP treated on both sides and then cyclic loading was applied with R = 0.1. Residual stress profiles of as-built specimens showed tensile residual stresses while specimens with LSP exhibited compressive residual stresses. Fatigue life in specimens with stress relief heat treatment plus LSP showed an increase of 18–22% with respect to that of as-built specimens. Porosity levels were lower than 1% in the tested specimens, while surface microhardness increased due to LSP. It is shown that LSP is a viable alternative to improve the performance of IN718 components processed with AM.

Graphical Abstract

Abstract Image

将激光冲击强化作为激光粉末床熔融技术制造的铬镍铁合金 718 部件的后处理技术
快速成型制造(AM)在高效制造复杂部件方面已显示出优势。然而,它也有一些局限性,那就是制造出来的部件存在缺陷,可能会限制其机械性能。本文旨在研究激光冲击强化(LSP)作为后处理技术对 AM 制成的部件的影响。本文评估了通过激光粉末床熔融(LPBF)制造并经 LSP 处理的 Inconel 718 样品的孔隙率、微观结构、残余应力和疲劳寿命。在进行激光冲击强化(LSP)处理时,使用了波长为 1064 nm、频率为 10 Hz 的 Nd:YAG 脉冲激光器;脉冲密度为 2500 脉冲/cm2。LSP 设置为不带保护层的水刀布置。残余应力分布与深度的函数关系是通过钻孔法测定的。疲劳试样的两面都经过 LSP 处理,然后施加 R = 0.1 的循环载荷。竣工试样的残余应力曲线显示出拉伸残余应力,而经过 LSP 处理的试样则显示出压缩残余应力。经过去应力热处理和 LSP 处理的试样的疲劳寿命比原样试样提高了 18-22%。测试试样的孔隙率低于 1%,而表面显微硬度则因 LSP 而增加。结果表明,LSP 是提高用 AM 加工的 IN718 部件性能的一种可行的替代方法。
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来源期刊
CiteScore
5.70
自引率
17.60%
发文量
2008
审稿时长
62 days
期刊介绍: The International Journal of Advanced Manufacturing Technology bridges the gap between pure research journals and the more practical publications on advanced manufacturing and systems. It therefore provides an outstanding forum for papers covering applications-based research topics relevant to manufacturing processes, machines and process integration.
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