Effect of Bulk Shape on Mechanical Properties of Ti-6Al-4V Alloy Manufactured by Laser Powder Bed Fusion

Park, H.K.; Kim, Yeon Woo; Lee, Seungyeon; Kim, Young Ho; Yu, Jing; Kim, Jung Gi; Park, Jeong Min

doi:10.4150/kpmi.2023.30.2.140

Cited by 4 publications

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“…H13 steel is suitable for hot-work tools because of its excellent wear and high thermal shock resistance [3–5]. H13 steel is manufactured by casting with machining for fabricating moulds and dies; however, recent industries demand novel manufacturing techniques to produce complex-shaped products to overcome the limited design freedom of traditional manufacturing techniques [6–10]. Moreover, producing engineering parts with geometric complexity using traditional processes such as cutting or tooling is difficult because H13 steel exhibits high hardness and low formability [11].…”

Section: Introductionmentioning

confidence: 99%

High-speed manufacturing-driven strength-ductility improvement of H13 tool steel fabricated by selective laser melting

Kim,

Park,

Eom

et al. 2023

Powder Metallurgy

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H13 tool steel was additively manufactured by selective laser melting (SLM). The sample printed at a higher laser scan speed exhibited higher strength and ductility than those of the sample printed at a lower speed. The samples were repeatedly exposed to a massive heat input during the SLM. The in-situ tempering effect was applied to the sample; the phase fraction is changed by varying the heat input by controlling the laser scan speed. The microstructure analysis showed that the sample printed at a higher scan speed had a higher fraction of retained austenite than at a lower speed. The former was affected by deformation-induced martensitic transformation with enhanced strain-hardening ability. This study entailed the control of process parameters to improve the mechanical properties and the productivity of SLM-printed H13 tool steel. It investigated the relationship between the laser scan speed and the phase fraction, whose effect on the mechanical properties was confirmed.

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Section: Introductionmentioning

confidence: 99%

High-speed manufacturing-driven strength-ductility improvement of H13 tool steel fabricated by selective laser melting

Kim,

Park,

Eom

et al. 2023

Powder Metallurgy

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Data-driven Approach to Explore the Contribution of Process Parameters for Laser Powder Bed Fusion of a Ti-6Al-4V Alloy

Park,

Jung,

Lee

et al. 2024

J Powder Mater

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In order to predict the process window of laser powder bed fusion (LPBF) for printing metallic components, the calculation of volumetric energy density (VED) has been widely calculated for controlling process parameters. However, because it is assumed that the process parameters contribute equally to heat input, the VED still has limitation for predicting the process window of LPBF-processed materials. In this study, an explainable machine learning (xML) approach was adopted to predict and understand the contribution of each process parameter to defect evolution in Ti alloys in the LPBF process. Various ML models were trained, and the Shapley additive explanation method was adopted to quantify the importance of each process parameter. This study can offer effective guidelines for fine-tuning process parameters to fabricate high-quality products using LPBF.

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Microstructural Evolution and Mechanical Properties of Ti-6Al-4V Alloy through Selective Laser Melting: Comprehensive Study on the Effect of Hot Isostatic Pressing (HIP)

Roy,

Hajra,

Kim

et al. 2024

J Powder Mater

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This study explores the profound impact of varying oxygen content on microstructural and mechanical properties in specimens HO and LO. The higher oxygen concentration in specimen HO is found to significantly influence alpha lath sizes, resulting in a size of 0.5-1 μm, contrasting with the 1-1.5 μm size observed in specimen LO. Pore fraction, governed by oxygen concentration, is high in specimen HO, registering a value of 0.11%, whereas specimen LO exhibits a lower pore fraction (0.02%). Varied pore types in each specimen further underscore the role of oxygen concentration in shaping microstructural morphology. Despite these microstructural variations, the average hardness remains consistent at ~370 HV. This study emphasizes the pivotal role of oxygen content in influencing microstructural features, contributing to a comprehensive understanding of the intricate interplay between elemental composition and material properties.

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Effect of Bulk Shape on Mechanical Properties of Ti-6Al-4V Alloy Manufactured by Laser Powder Bed Fusion

Cited by 4 publications

References 0 publications

High-speed manufacturing-driven strength-ductility improvement of H13 tool steel fabricated by selective laser melting

High-speed manufacturing-driven strength-ductility improvement of H13 tool steel fabricated by selective laser melting

Data-driven Approach to Explore the Contribution of Process Parameters for Laser Powder Bed Fusion of a Ti-6Al-4V Alloy

Microstructural Evolution and Mechanical Properties of Ti-6Al-4V Alloy through Selective Laser Melting: Comprehensive Study on the Effect of Hot Isostatic Pressing (HIP)

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