Influence of heat treatments on microstructure evolution and mechanical properties of Inconel 625 processed by laser powder bed fusion

Marchese, Giulio; Lorusso, Massimo; Parizia, Simone; Bassini, Emilio; Lee, Jiwon; Calignano, Flaviana; Manfredi, Diego; Terner, Mathieu; Hong, Hyun-Uk; Ugues, Daniele; Lombardi, Mariangela; Biamino, Sara

doi:10.1016/j.msea.2018.05.044

Cited by 216 publications

(123 citation statements)

References 34 publications

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“…827 MPa (UTS)) for LPBF IN625 alloy. Regarding other studies, the mechanical properties at room temperature of the SR specimens obtained in this study were comparable to those reported in References [13,19,21,38] for the as-built LPBF IN625 alloy. However, the high mechanical strength of the SR specimens came with a significant orientation dependency in the mechanical characteristics due to a strong microstructure anisotropy, which was inherited from the as-built material [16].…”

Section: Discussionsupporting

confidence: 88%

“…By contrast, the ST and HIP specimens containing equiaxed grains and a random texture manifested build-orientation-independent behavior, but lower mechanical strength characteristics. The equiaxed grain structure and reduced mechanical strength characteristics after post-treatments performed at temperatures higher than 1100 °C have also been reported in References [13,21].…”

Section: Discussionmentioning

confidence: 58%

“…An excellent combination of outstanding corrosion resistance and superior creep resistance, as well as the relatively high tensile strength of nickel-based IN625 alloy (up to 600 • C), make it an interesting choice for aerospace applications. It has been shown that post-processing annealing of LPBF IN625 alloy can significantly improve its room temperature ductility as compared to its as-built state [13,[19][20][21]. However, the assessment of mechanical properties cannot solely be limited to room temperature testing, especially for materials dedicated for service at elevated temperatures.…”

Section: Introductionmentioning

confidence: 99%

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Temperature- and Time-Dependent Mechanical Behavior of Post-Treated IN625 Alloy Processed by Laser Powder Bed Fusion

Kreitcberg

Inaekyan

Turenne

et al. 2019

JMMP

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The microstructure and mechanical properties of IN625 alloy processed by laser powder bed fusion (LPBF) and then subjected to stress relief annealing, high temperature solution treatment, and hot isostatic pressing were studied. Tensile testing to failure was carried out in the 25-871 • C temperature range. Creep testing was conducted at 760 • C under 0.5-0.9 yield stress conditions. The results of the present study provided valuable insights into the static and creep properties of LPBF IN625 alloy, as compared to a wrought annealed alloy of similar composition. It was shown that at temperatures below 538 • C, the mechanical resistance and elongation to failure of the LPBF alloy were similar to those of its wrought counterpart, whereas at higher temperatures, the elongation to failure of the LPBF alloy became significantly lower than that of the wrought alloy. The solution-treated LPBF alloy exhibited significantly improved creep properties at 760 • C as compared to the wrought annealed alloy, especially under intermediate and low levels of stress.

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Section: Discussionsupporting

confidence: 88%

Section: Discussionmentioning

confidence: 58%

Section: Introductionmentioning

confidence: 99%

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Temperature- and Time-Dependent Mechanical Behavior of Post-Treated IN625 Alloy Processed by Laser Powder Bed Fusion

Kreitcberg

Inaekyan

Turenne

et al. 2019

JMMP

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“…Moreover, in the LPBF process, it is fundamental to optimize the main process parameters, such as laser power and scanning speed, layer thickness, hatching distance, scanning strategy, with respect to the starting powder in order to obtain dense components. In the literature, the influence of the different process parameters on the microstructure and mechanical properties [17,[19][20][21][22][23], density and surface quality [24][25][26][27][28][29] has been investigated. Other research has focused on simulation of the melt pool behavior [30], on kinetics [31], on post-processing treatments [32][33][34], on corrosion behavior [35,36] and on tribology properties [37,38].…”

Section: Introductionmentioning

confidence: 99%

A357 Alloy by LPBF for Industry Applications

Lorusso

Trevisan²,

Calignano³

et al. 2020

Materials

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The aim of this study is to define the process parameters to build components for industrial applications in A357 alloy by Laser Powder Bed Fusion (LPBF) and to evaluate the effects of post-processing heat treatments on the microstructure and mechanical properties in order to obtain the highest hardness and strength. First, process parameters values were defined to obtain full dense components with highest productivity. Then samples were built for microstructural, hardness, and tensile strength investigation in different conditions: as-built, after a stress-relieving treatment, and after a T6 precipitation hardening treatment. For this latest treatment, different time and temperatures for solution and ageing were investigated to find the best in terms of final hardness achievable. It is demonstrated that samples in A357 alloy can be successfully fabricated by LPBF with a density of 99.9% and a mean hardness value achievable of 116 HV0.1, in as-built condition. However, for production purposes, it is fundamental to reduce the residual stresses typical of LPBF. It was shown that a similar hardness value could be obtained after a stress-relieving treatment followed by a proper T6 treatment, together with a coarser but more isotropic microstructure.

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“…For that reason, also the response to the solution treatment can be much different from that provided on traditionally fabricated alloys. Actually, the particular initial conditions of the material characterized by anisotropy, residual stress states, fine microstructure, and marked micro‐segregation patterns can require to define a completely new solutioning recipe …”

Section: Introductionmentioning

confidence: 99%

Solution Treatment Study of Inconel 718 Produced by SLM Additive Technique in View of the Oxidation Resistance

et al. 2018

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The additive manufacturing concept for the production of complex near net shape metal parts is obtaining increasing attention due to the possibility of producing assembled and/or complex parts allowing optimal design and saving time and cost. The possibility to use the free design of Selective Laser Melting (SLM) techniques for the fabrication of complex 3D components using high performing, although difficult to work, materials such as Ni superalloys is really attractive. The particular process conditions that are established during additive manufacturing in SLM leads to microstructures different with respect to those observed in standard cast or wrought analogous material. Therefore, it is usually necessary to apply a post solution treatment, in order to reduce the segregation of heavier elements (in particular Nb) and dissolve the interdendritic precipitates. In this study, the influence of temperature and time of the solution treatment on the microstructure is investigated in order to find the best results in terms of the final oxidation resistance. Oxidation performances of solutioned Inconel 718 fabricated via SLM are reported and discussed. The growth rate of the superficial oxide at the temperature of 850 C was measured and the longterm stability of this passivating layer was tested until 908 h.

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Influence of heat treatments on microstructure evolution and mechanical properties of Inconel 625 processed by laser powder bed fusion

Cited by 216 publications

References 34 publications

Temperature- and Time-Dependent Mechanical Behavior of Post-Treated IN625 Alloy Processed by Laser Powder Bed Fusion

Temperature- and Time-Dependent Mechanical Behavior of Post-Treated IN625 Alloy Processed by Laser Powder Bed Fusion

A357 Alloy by LPBF for Industry Applications

Solution Treatment Study of Inconel 718 Produced by SLM Additive Technique in View of the Oxidation Resistance

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