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Microstructure-based modelling of tensile properties of heat treated Inconel 718 alloy produced by laser powder bed fusion
https://orcid.org/http://orcid.org/0000-0002-9070-2043
Due to the instability of the γ″ phase at elevated temperatures, leading to the δ phase transformation, effects of the delta (δ) process treatment (DPT) on tensile stress–strain characteristics of Inconel 718 alloy fabricated by laser powder bed fusion (L-PBF) process at varying powers were investigated using experiments and microstructure-based modelling in this study. Additively manufactured test specimens were firstly subjected to a direct aging treatment and then followed by the DPT processes. Microstructure and fractography analyses of the heat treated samples were conducted and effects of δ phase emergence on resulting tensile properties were investigated. In addition, a microstructure-based approach using representative volume elements (RVEs) were proposed for describing stress–strain behaviors of specimens from different conditions. Observed microstructure features were incorporated and micromechanics parameters of the matrix and δ phase were determined. It was found that predicted flow stress curves fairly agreed with those from the experiments. Increasing amount and size of the δ phase in the printed Inconel samples by longer DPT holding time led to decreased strength due to the depletion of strengthening γ′′ phase, but enhanced strain hardening because of the pinning effect on dislocation migration by δ phase particles. Short-rod bulky δ phase at grain boundaries rather promoted earlier crack initiation and caused lowered fracture elongation than needle-like δ phase within the matrix. For built samples from conditions close to the border of process window, predictions of crack formation and total elongations by RVE simulations required accurately measured porosities and their interaction with the δ phase.
Microstructure-based modelling of tensile properties of heat treated Inconel 718 alloy produced by laser powder bed fusion
https://orcid.org/http://orcid.org/0000-0002-9070-2043
Due to the instability of the γ″ phase at elevated temperatures, leading to the δ phase transformation, effects of the delta (δ) process treatment (DPT) on tensile stress–strain characteristics of Inconel 718 alloy fabricated by laser powder bed fusion (L-PBF) process at varying powers were investigated using experiments and microstructure-based modelling in this study. Additively manufactured test specimens were firstly subjected to a direct aging treatment and then followed by the DPT processes. Microstructure and fractography analyses of the heat treated samples were conducted and effects of δ phase emergence on resulting tensile properties were investigated. In addition, a microstructure-based approach using representative volume elements (RVEs) were proposed for describing stress–strain behaviors of specimens from different conditions. Observed microstructure features were incorporated and micromechanics parameters of the matrix and δ phase were determined. It was found that predicted flow stress curves fairly agreed with those from the experiments. Increasing amount and size of the δ phase in the printed Inconel samples by longer DPT holding time led to decreased strength due to the depletion of strengthening γ′′ phase, but enhanced strain hardening because of the pinning effect on dislocation migration by δ phase particles. Short-rod bulky δ phase at grain boundaries rather promoted earlier crack initiation and caused lowered fracture elongation than needle-like δ phase within the matrix. For built samples from conditions close to the border of process window, predictions of crack formation and total elongations by RVE simulations required accurately measured porosities and their interaction with the δ phase.
Microstructure-based modelling of tensile properties of heat treated Inconel 718 alloy produced by laser powder bed fusion
https://orcid.org/http://orcid.org/0000-0002-9070-2043
Due to the instability of the γ″ phase at elevated temperatures, leading to the δ phase transformation, effects of the delta (δ) process treatment (DPT) on tensile stress–strain characteristics of Inconel 718 alloy fabricated by laser powder bed fusion (L-PBF) process at varying powers were investigated using experiments and microstructure-based modelling in this study. Additively manufactured test specimens were firstly subjected to a direct aging treatment and then followed by the DPT processes. Microstructure and fractography analyses of the heat treated samples were conducted and effects of δ phase emergence on resulting tensile properties were investigated. In addition, a microstructure-based approach using representative volume elements (RVEs) were proposed for describing stress–strain behaviors of specimens from different conditions. Observed microstructure features were incorporated and micromechanics parameters of the matrix and δ phase were determined. It was found that predicted flow stress curves fairly agreed with those from the experiments. Increasing amount and size of the δ phase in the printed Inconel samples by longer DPT holding time led to decreased strength due to the depletion of strengthening γ′′ phase, but enhanced strain hardening because of the pinning effect on dislocation migration by δ phase particles. Short-rod bulky δ phase at grain boundaries rather promoted earlier crack initiation and caused lowered fracture elongation than needle-like δ phase within the matrix. For built samples from conditions close to the border of process window, predictions of crack formation and total elongations by RVE simulations required accurately measured porosities and their interaction with the δ phase.
Microstructure-based modelling of tensile properties of heat treated Inconel 718 alloy produced by laser powder bed fusion
Arch. Civ. Mech. Eng.
Kumnaknoppakun, P. (author) / Uthaisangsuk, V. (author)
2024-09-05
Article (Journal)
Electronic Resource
English
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