Effect of Laser Shock Peening on Properties of Heat-Treated Ti–6Al–4V Manufactured by Laser Powder Bed Fusion

2020 ◽  
Author(s):  
Inkyu Yeo ◽  
Seongguk Bae ◽  
Auezhan Amanov ◽  
Sungho Jeong
Keyword(s):  
Laser Shock Peening ◽  
Powder Bed Fusion ◽  
Laser Shock ◽  
Laser Powder Bed Fusion ◽  
Powder Bed ◽  
Heat Treated ◽  
Shock Peening

scholarly journals A parametric neutron Bragg edge imaging study of additively manufactured samples treated by laser shock peening

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Matteo Busi ◽  
Nikola Kalentics ◽  
Manuel Morgano ◽  
Seth Griffiths ◽  
Anton S. Tremsin ◽  
...  
Keyword(s):  
Residual Stress ◽  
Additive Manufacturing ◽  
Residual Stresses ◽  
Compressive Residual Stress ◽  
Laser Shock Peening ◽  
Powder Bed Fusion ◽  
Laser Shock ◽  
Laser Powder Bed Fusion ◽  
Powder Bed ◽  
Shock Peening

AbstractLaser powder bed fusion is an additive manufacturing technique extensively used for the production of metallic components. Despite this process has reached a status at which parts are produced with mechanical properties comparable to those from conventional production, it is still prone to introduce detrimental tensile residual stresses towards the surfaces along the building direction, implying negative consequences on fatigue life and resistance to crack formations. Laser shock peening (LSP) is a promising method adopted to compensate tensile residual stresses and to introduce beneficial compressive residual stress on the treated surfaces. Using neutron Bragg edge imaging, we perform a parametric study of LSP applied to 316L steel samples produced by laser powder bed fusion additive manufacturing. We include in the study the novel 3D-LSP technique, where samples are LSP treated also during the building process, at intermediate build layers. The LSP energy and spot overlap were set to either 1.0 or 1.5 J and 40$$\%$$ % or 80$$\%$$ % respectively. The results support the use of 3D-LSP treatment with the higher LSP laser energy and overlap applied, which showed a relative increase of surface compressive residual stress (CRS) and CRS depth by 54$$\%$$ % and 104$$\%$$ % respectively, compared to the conventional LSP treatment.

scholarly journals A Parametric Neutron Bragg Edge Imaging Study of Additively Manufactured Samples Treated by Laser Shock Peening

2021 ◽  
Author(s):  
Matteo Busi ◽  
Nikola Kalentics ◽  
Manuel Morgano ◽  
Seth Griffiths ◽  
Anton S. Tremsin ◽  
...  
Keyword(s):  
Residual Stress ◽  
Additive Manufacturing ◽  
Residual Stresses ◽  
Compressive Residual Stress ◽  
Laser Shock Peening ◽  
Powder Bed Fusion ◽  
Laser Shock ◽  
Laser Powder Bed Fusion ◽  
Powder Bed ◽  
Shock Peening

Abstract Laser powder bed fusion is an additive manufacturing technique extensively used for the production of metallic components. Despite this process has reached a status at which parts are produced with mechanical properties comparable to those from conventional production, it is still prone to introduce detrimental tensile residual stresses towards the surfaces along the building direction, implying negative consequences on fatigue life and resistance to crack formations. Laser shock peening (LSP) is a promising method adopted to compensate tensile residual stresses and to introduce beneficial compressive residual stress on the treated surfaces. Using neutron Bragg edge imaging, we perform a parametric study of LSP applied to 316L steel samples produced by laser powder bed fusion additive manufacturing. We include in the study the novel 3D-LSP technique, where samples are LSP treated also during the building process, at intermediate build layers. The LSP energy and spot overlap were set to either 1.0 or 1.5 J and 40% or 80% respectively. The results support the use of 3D-LSP treatment with the higher LSP laser energy and overlap applied, which showed a relative increase of surface compressive residual stress (CRS) and CRS depth by 57% and 104% respectively, compared to the conventional LSP treatment.

The role of texturing and microstructure evolution on the tensile behavior of heat-treated Inconel 625 produced via laser powder bed fusion

2020 ◽  
Vol 769 ◽  
pp. 138500 ◽  
Author(s):  
Giulio Marchese ◽  
Simone Parizia ◽  
Masoud Rashidi ◽  
Abdollah Saboori ◽  
Diego Manfredi ◽  
...  
Keyword(s):  
Microstructure Evolution ◽  
Tensile Behavior ◽  
Inconel 625 ◽  
Powder Bed Fusion ◽  
Laser Powder Bed Fusion ◽  
Powder Bed ◽  
Heat Treated

scholarly journals Short Heat Treatments for the F357 Aluminum Alloy Processed by Laser Powder Bed Fusion

Materials ◽  
2021 ◽  
Vol 14 (20) ◽  
pp. 6157
Author(s):  
Matteo Vanzetti ◽  
Enrico Virgillito ◽  
Alberta Aversa ◽  
Diego Manfredi ◽  
Federica Bondioli ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Precipitation Hardening ◽  
Solution Treatment ◽  
Heat Treatments ◽  
Point Of View ◽  
Powder Bed Fusion ◽  
Laser Powder Bed Fusion ◽  
Powder Bed ◽  
Heat Treated ◽  
Direct Aging

Conventionally processed precipitation hardening aluminum alloys are generally treated with T6 heat treatments which are time-consuming and generally optimized for conventionally processed microstructures. Alternatively, parts produced by laser powder bed fusion (L-PBF) are characterized by unique microstructures made of very fine and metastable phases. These peculiar features require specifically optimized heat treatments. This work evaluates the effects of a short T6 heat treatment on L-PBF AlSi7Mg samples. The samples underwent a solution step of 15 min at 540 °C followed by water quenching and subsequently by an artificial aging at 170 °C for 2–8 h. The heat treated samples were characterized from a microstructural and mechanical point of view and compared with both as-built and direct aging (DA) treated samples. The results show that a 15 min solution treatment at 540 °C allows the dissolution of the very fine phases obtained during the L-PBF process; the subsequent heat treatment at 170 °C for 6 h makes it possible to obtain slightly lower tensile properties compared to those of the standard T6. With respect to the DA samples, higher elongation was achieved. These results show that this heat treatment can be of great benefit for the industry.

Effect of laser shock peening and heat‑treated on surface hardness of Ti–6Al–4V

2021 ◽  
Author(s):  
Liming Yuan ◽  
Wentai Ouyang ◽  
Xiu Qin ◽  
Wenwu Zhang ◽  
Pengkai Liu ◽  
...  
Keyword(s):  
Surface Hardness ◽  
Laser Shock Peening ◽  
Laser Shock ◽  
Heat Treated ◽  
Shock Peening

Dynamic-loading behavior and anisotropic deformation of pre- and post-heat-treated IN718 fabricated by laser powder bed fusion

2020 ◽  
Vol 33 ◽  
pp. 101083 ◽  
Author(s):  
Nadia Kouraytem ◽  
Raphaël A. Chanut ◽  
Dillon S. Watring ◽  
Timmanee Loveless ◽  
John Varga ◽  
...  
Keyword(s):  
Dynamic Loading ◽  
Powder Bed Fusion ◽  
Laser Powder Bed Fusion ◽  
Powder Bed ◽  
Heat Treated ◽  
Anisotropic Deformation

scholarly journals Laser Powder Bed Fusion of Inconel 718: Residual Stress Analysis Before and After Heat Treatment

Metals ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 1290 ◽  
Author(s):  
Rafael Barros ◽  
Francisco J. G. Silva ◽  
Ronny M. Gouveia ◽  
Abdollah Saboori ◽  
Giulio Marchese ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Lateral Surface ◽  
Extreme Temperature ◽  
Hole Drilling ◽  
Powder Bed Fusion ◽  
Laser Powder Bed Fusion ◽  
Powder Bed ◽  
Tensile Stresses ◽  
Compressive Stresses ◽  
Heat Treated

Residual stresses (RS) of great magnitude are usually present in parts produced by Laser Powder Bed Fusion (PBF-LB), mainly owing to the extreme temperature gradients and high cooling rates involved in the process. Those “hidden” stresses can be detrimental to a part’s mechanical properties and fatigue life; therefore, it is crucial to know their magnitude and orientation. The hole-drilling strain-gage method was used to determine the RS magnitude and direction-depth profiles. Cuboid specimens in the as-built state, and after standard solution annealing and ageing heat treatment conditions, were prepared to study the RS evolution throughout the heat treatment stages. Measurements were performed on the top and lateral surfaces. In the as-built specimens, tensile stresses of ~400 MPa on the top and above 600 MPa on the lateral surface were obtained. On the lateral surface, RS anisotropy was noticed, with the horizontally aligned stresses being three times lower than the vertically aligned. RS decreased markedly after the first heat treatment. On heat-treated specimens, magnitude oscillations were observed. By microstructure analysis, the presence of carbides was verified, which is a probable root for the oscillations. Furthermore, compressive stresses immediate to the surface were obtained in heat-treated specimens, which is not in agreement with the typical characteristics of parts fabricated by PBF-LB, i.e., tensile stresses at the surface and compressive stresses in the part’s core.

scholarly journals Corrosion Behavior of Heat-Treated AlSi10Mg Manufactured by Laser Powder Bed Fusion

Materials ◽  
2018 ◽  
Vol 11 (7) ◽  
pp. 1051 ◽  
Author(s):  
Marina Cabrini ◽  
Flaviana Calignano ◽  
Paolo Fino ◽  
Sergio Lorenzi ◽  
Massimo Lorusso ◽  
...  
Keyword(s):  
Corrosion Behavior ◽  
Powder Bed Fusion ◽  
Laser Powder Bed Fusion ◽  
Powder Bed ◽  
Heat Treated
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