Effect of double stage solution treatment on the volume fraction of massive phase (αm) as a new method to obtain a fine lamellar α/β in Ti–6Al–4V alloy

Suprobo, Ghozali; Park, Nokeun; Baek, Eung Ryul

doi:10.1016/j.intermet.2019.106581

Cited by 12 publications

(3 citation statements)

References 28 publications

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“…It observes that the fraction of αm formation kept increasing with a longer holding time in the second-stage of DSST, which was indicated by the increase in the featureless or clear area (Fig. 6), as previously reported [15]. It also can be noted that the occurrence of the α′ martensite during the short period holding at second stage of DSST in Fig.…”

Section: Mechanical Property Evaluation Of Massive Phase As a Prospec...supporting

confidence: 86%

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Massive Phase Transformation as a New Prospective on Microstructural Design in a Titanium Alloy - A Review

Baek

Suprobo

2020

MSF

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Microstructural design is generally applied to improve the mechanical property of titanium alloy by introducing different phase transformations and thermomechanical treatments. Aside from the martensitic and diffusion transformation, the occurrence of massive transformation occurs in Ti alloy. Massive transformation is categorized as civilian phase transformation, which resulted in the change of crystal structure of an alloy with a given composition without changing the chemical composition of its initial phase. It happened when the body centered-cubic β phase changed into hexagonal closed-pack α phase without decomposing into α+β. Massive transformation involves a diffusion and growth mechanism in a short-range and generally occurs during the introduction of high cooling rates to restrict the full diffusion mechanism. Owing to the nature of a rapid cooling rate as a requirement for massive transformation, the massive phase is normally found together with the product of martensitic transformation. On the other hand, the product of massive transformation is observed as a blocky grain with a featureless characteristic using optical microscopy and. Phase identification using electron backscattered diffraction shows that the region of αm shows only the presence of the α phase. It was reported for containing a high dislocation density similar to martensitic transformation. Specifically, in Ti alloy, the higher magnification using scanning electron microscopy shows fine sub-lamellar morphology, which observed as a combination product morphology between martensitic and diffusion transformation. It resulted in the mechanical property of the massive phase is between those two morphologies. Hence, it brings a new perspective on designing the microstructure of Ti alloy, which can be used to improve the mechanical property of Ti alloy.

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Section: Mechanical Property Evaluation Of Massive Phase As a Prospec...supporting

confidence: 86%

“…It should be noted the nature of annealing will change the transformation mechanism into a dominant diffusion process resulted in the formation of a lamellar structure on the untransformed β phase during a longer holding time (Fig. 5c-d) [15].…”

Section: Mechanical Property Evaluation Of Massive Phase As a Prospec...mentioning

confidence: 99%

Massive Phase Transformation as a New Prospective on Microstructural Design in a Titanium Alloy - A Review

Baek

Suprobo

2020

MSF

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“…This phenomenon can be correlated with the alteration of the α' and α m microstructural morphology. These hardness values are generally higher than those in Ti-6Al-4V produced using other fabrication methods 14,15) and the substrate's mean hardness (356 HV). Furthermore, it is noticed the hardness values increase with the increasing powder feed rate, and the specimen with the powder feed rate of 9 g•min -1 exhibits the highest hardness values among the other specimens in this study.…”

Section: Layermentioning

confidence: 68%

The Effect of Decomposed Microstructure on Mechanical Properties of Additively Manufactured Ti-6Al-4V Alloy

Nursyifaulkhair

Park

Baek

2021

Journal of Welding and Joining

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This study investigated the effect of microstructural decomposition on the mechanical properties of additively manufactured Ti-6Al-4V by directed energy deposition. The formation of ' martensite and massive phase ( m ) was observed in the deposited layers. The ' and m in the lastly deposited layer appeared as a needle-shaped and a sub-lamellar structure, respectively. However, the morphology of ' and m was decomposed in the lower layers due to the intrinsic heat treatment. Moreover, The heat conduction rate calculation showed that the lower powder feed rate generates more heat conduction. Therefore, the microstructure was further decomposed for the specimen with a lower powder feed rate. These phenomena consequently affected the mechanical properties and fracture behavior of the Ti-6Al-4V alloy.

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Material Characterization of Alloy for Aerospace Application: Effect of Laser Power on the Co-axially Deposited T64 Alloy and Cu

Erinosho

Akinlabi

Oladosu

2022

Advanced Composites in Aerospace Engineering Applications

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Effect of double stage solution treatment on the volume fraction of massive phase (αm) as a new method to obtain a fine lamellar α/β in Ti–6Al–4V alloy

Cited by 12 publications

References 28 publications

Massive Phase Transformation as a New Prospective on Microstructural Design in a Titanium Alloy - A Review

Massive Phase Transformation as a New Prospective on Microstructural Design in a Titanium Alloy - A Review

The Effect of Decomposed Microstructure on Mechanical Properties of Additively Manufactured Ti-6Al-4V Alloy

Material Characterization of Alloy for Aerospace Application: Effect of Laser Power on the Co-axially Deposited T64 Alloy and Cu

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