Transformation-mediated in-situ β recrystallization in laser powder-bed fusion additively manufactured Ti-6Al-4V DOI Creative Commons
Jianhao Chen, Daniel Fabijanic, Milan Brandt

и другие.

Materials Characterization, Год журнала: 2023, Номер 206, С. 113452 - 113452

Опубликована: Ноя. 4, 2023

Achieving equiaxed grain structure is highly sought after in metal processing for most critical structural applications but it seldom realized Ti-6Al-4 V additively manufactured (AM) by laser powder-bed fusion (LPBF) due to its unique thermal environment favor of columnar growth. To convert grains into equiaxed, post heat treatment the β phase field often adopted initiate recrystallization prior-β grains. This study demonstrates achievement situ LPBF via epitaxial mediated α → transformation taking place rapid heating stage cycling. In this reverse process, new nuclei distinct variants their parent nucleate directly on matrix accordance with Burgers orientation relationship and grow towards surrounding while transforming within a specific grain. hypothesis strongly supported experimental evidence that significant fraction β/β boundaries are featured misorientations near 60° both as-built those subjected treatment. essentially excludes conventional as mechanism responsible evolution state. The finding unveils role cycling associated microstructure paves way development high-quality AM reduced performance anisotropy.

Язык: Английский

Material removal and surface finishing of additively manufactured Ti-6Al-4V coupons by cyclic process of plasma electrolytic polishing DOI
Yee Ng, Xian Yi Tan, Tzee Luai Meng

и другие.

Surface and Coatings Technology, Год журнала: 2025, Номер unknown, С. 131872 - 131872

Опубликована: Янв. 1, 2025

Язык: Английский

Процитировано

4

High-strength titanium alloy with hierarchical-microstructure design via in-situ refinement-splitting strategy in additive manufacturing DOI
Zhifu Yao, Minglin He, Yi Jiang

и другие.

Additive manufacturing, Год журнала: 2024, Номер 80, С. 103969 - 103969

Опубликована: Янв. 1, 2024

Язык: Английский

Процитировано

17

A novel magnetic field assisted powder arc additive manufacturing for Ti60 titanium alloy: Method, microstructure and mechanical properties DOI

Kexin Kang,

Yibo Liu,

Huisheng Ren

и другие.

Additive manufacturing, Год журнала: 2024, Номер 83, С. 104065 - 104065

Опубликована: Март 1, 2024

Язык: Английский

Процитировано

9

Deciphering severe plastic deformation in additively manufactured Ti6Al4V alloy: Gradient microstructural evolution mechanism DOI
Dan Liú, Xingchen Xu, Junfeng Cui

и другие.

Journal of Alloys and Compounds, Год журнала: 2025, Номер unknown, С. 178898 - 178898

Опубликована: Янв. 1, 2025

Язык: Английский

Процитировано

1

The reverse transformation mechanism of β phase and its stability of Ti-6Al-4V alloy fabricated via laser powder bed fusion DOI Creative Commons
Wenjing Zhang,

Leilei Xing,

Shubo Zhang

и другие.

Materials & Design, Год журнала: 2024, Номер 241, С. 112926 - 112926

Опубликована: Апрель 9, 2024

The laser powder bed fusion manufactured Ti-6Al-4 V alloy predominantly consists of α' martensite, resulting in excellent strength but limited ductility, hinders widespread application. Therefore, it is crucial to achieve the decomposition martensite and improve ductility. However, reverse transformation behavior its mechanism β phase, as well stability remain unclear. Our findings demonstrate that phase follows a diffusion-controlled process. into α + initiates at approximately 550 ℃, while from occurs around 870 ℃. Increasing temperature leads an increase reverse-transformed phase. retention these phases room also depends on their stability, which exhibits significant correlation with element partitioning. Additionally, this study reveals critical (840 ℃) maximum volume fraction (18.6 %) retained obtained, exhibiting exceptional mechanical properties, particularly uniform elongation surpassing those observed as-printed microstructure LPBF-ed alloy.

Язык: Английский

Процитировано

6

Microstructure evolution and strengthening behavior of maraging steel fabricated by wire arc additive manufacturing at different heat treatment processes DOI

Chengling Kan,

Lin Zhao, Yang Cao

и другие.

Materials Science and Engineering A, Год журнала: 2024, Номер 909, С. 146804 - 146804

Опубликована: Июнь 13, 2024

Язык: Английский

Процитировано

6

Achieving an Excellent Strength and Ductility Balance in Additive Manufactured Ti-6Al-4V Alloy through Multi-Step High-to-Low-Temperature Heat Treatment DOI Open Access
Changshun Wang, Lei Yan, Chenglin Li

и другие.

Materials, Год журнала: 2023, Номер 16(21), С. 6947 - 6947

Опубликована: Окт. 29, 2023

Selective laser melting (SLM) can effectively replace traditional processing methods to prepare parts with arbitrary complex shapes through layer-by-layer accumulation. However, SLM Ti-6Al-4V alloy typically exhibits low ductility and significant mechanical properties anisotropy due the presence of acicular α' martensite columnar prior β grains. Post-heat treatment is frequently used obtain superior by decomposing into an equilibrium α + phase. In this study, microstructure tensile before after various heat treatments were systematically investigated. The as-fabricated sample was composed grains martensite, which led high strength (~1400 MPa) but (~5%) as well significantly anisotropy. single samples lamellar exhibited improved elongation 6.8-13.1% a sacrifice 100-200 MPa, while weakened. A trimodal achieved multi-step high-to-low-temperature (HLT) treatment, resulting in excellent combination (~1090 (~17%), almost eliminated. comprehensive HLT that conventional manufactured alloy.

Язык: Английский

Процитировано

10

Microstructural evolution and mechanical properties of TiC/Ti6Al4V composites manufactured by selective laser melting after solution and aging treatments DOI Creative Commons

Peikang Bai,

Mingyang Chen, Wenbo Du

и другие.

Results in Physics, Год журнала: 2024, Номер 61, С. 107781 - 107781

Опубликована: Май 21, 2024

In this study, selective laser melting (SLM) technology was utilized to fabricate Ti6Al4V and TiC/Ti6Al4V composites. We then investigated the effect of solution heat treatment temperature aging time on microstructural mechanical properties both alloy The findings showed that with an increase in temperature, acicular martensite matrix composites progressively transitioned into plate-bar alpha phase. Concurrently, there a distinct irregularity morphology beta columnar grain boundaries, accompanied by evenly enhanced distributed With respect hardness, microhardness initially displayed slight drop followed significant increase, reaching peak 430 HV. contrast, composite materials exhibited initial minor substantial surge, maximum value 607 Post treatment, samples observed decrease from 463.2 HV 362.7 had notable influence + structure, where size martensitic phase constrained This study revealed extension resulted increased strengthening phase, subsequently leading reduction composite's microhardness. underscored pivotal role defining

Язык: Английский

Процитировано

4

Fundamental investigation into mass transfer process and microstructural transformation pathways in Ti-6Al-4V via underwater wire-laser directed energy deposition DOI Creative Commons

Yunlong Fu,

Mengqiu Yu,

Di Wu

и другие.

Virtual and Physical Prototyping, Год журнала: 2024, Номер 19(1)

Опубликована: Июль 12, 2024

The in-situ analysis of mass transfer behaviours in a novel underwater wire-laser directed energy deposition (ULDED) technique was conducted using X-ray high-speed imaging. By creating stable local dry cavity within the water environment, three distinct modes were identified: droplet transfer, liquid bridge and spreading modes. effectively managed by maintaining mode to enhance formability metal deposits. inherent heat treatment effect ULDED provides unique opportunity tailor microstructures mechanical properties situ with establishing thermal environment conducive preferred lamellar α+β microstructure instead acicular α′ martensite. With increasing input, diffusion-controlled transformation pathway gave rise martensite decomposition, underpinned morphological characteristics crystallographic orientations constituent phases.

Язык: Английский

Процитировано

3

Transitions of deformation mechanisms in new metastable β-titanium Ti-1500G alloy DOI Creative Commons
Yongqiang Ye,

Yuanfei Han,

Siyuan Zhang

и другие.

Materials & Design, Год журнала: 2025, Номер unknown, С. 113663 - 113663

Опубликована: Янв. 1, 2025

Язык: Английский

Процитировано

0