Achieving high ductility of Ti2AlNb sheet without sacrificing the tensile strength without post heat treatment

Sui, Xiaochong; Liu, Q.; Luo, Shiying; Liu, Y.K.; Li, Z.L.; Kang, Qingxin; Wang, G.F.

doi:10.1016/j.msea.2022.142897

Cited by 16 publications

(3 citation statements)

References 31 publications

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“…The columnar structure on the edges of the scanning channel, which was characterized by an increased number of nucleation sites compared with the upper surface of a molten pool, induced a cellular solidification front. High scanning speeds exhibited large thermal gradients and cooling rates at the molten pool, thus facilitating cellular structure formation [31]. With the increase in scanning speed from 600 to 900 mm/s, the grain structure varied from columnar to exhibiting the coexistence of cellular grains and columnar grains around the melted tracks.…”

Section: Microstructure Characteristics and Grain Orientationmentioning

confidence: 99%

“…Their results suggested that the precipitation of the TiAl 3 phase is largely correlated with temperature. Given the reheating effect exerted by the substrate, scanning speed will affect the energy input and cooling rate, thus affecting the precipitation of secondary phases [31]. Furthermore, the amount of TiAl 3 phases was relatively low due to the transient reheating process.…”

Section: Phase Distributionmentioning

confidence: 99%

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Effect of Scanning Strategies on the Microstructure and Mechanical Properties of Ti-22Al-25Nb Alloy Fabricated through Selective Laser Melting

Lin

Shan

Yang

et al. 2023

Metals

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In this study, Ti-22Al-25Nb intermetallic compound alloys are fabricated through selective laser melting (SLM) at four scanning speeds (600, 700, 800, and 900 mm/s). The microstructure and mechanical properties of the selective laser melting fabricated alloys are systematically evaluated. The results indicate that scanning speed significantly affects microstructure characteristics (e.g., relative density, grain size, texture density, and the precipitation of secondary phases). The variation laws of the relative density, grain size, and texture density are likewise affected by scanning speed. The relative density, grain size, and texture density increase and then decrease with the increase in scanning speed. The alloy fabricated with the lowest scanning speed (600 mm/s) exhibits the maximum relative density, grain size, and texture density. By contrast, the alloy with the highest scanning speed (900 mm/s) exhibits the minimum relative density, grain size, and texture density. Furthermore, the precipitations of the O phase and Ti3Al phase are primarily distributed in regions with a high strain concentration near the pool boundary. The alloy fabricated with a 600 mm/s scanning speed simultaneously achieves the highest strength and elongation, which is closely correlated with the uniform distribution of secondary phases.

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Section: Microstructure Characteristics and Grain Orientationmentioning

confidence: 99%

Section: Phase Distributionmentioning

confidence: 99%

Effect of Scanning Strategies on the Microstructure and Mechanical Properties of Ti-22Al-25Nb Alloy Fabricated through Selective Laser Melting

Lin

Shan

Yang

et al. 2023

Metals

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“…[3] However, the improvements of the tensile properties are limited by the individual mechanisms. [4] Prior austenite grain (PAG) refinement is an effective way for improving the toughness of high-strength martensitic steels. [5] For instance, Sun et al [6] effectively reduced the brittle twin martensite fraction using a grain refinement strategy and produced the ultimate tensile strength (UTS) of 2.2 GPa and ≈10% ultimate elongation (UE) in high-carbon martensitic steel.…”

Section: Introductionmentioning

confidence: 99%

Effect of Controlled Rolling on the Strength and Toughness of Low‐Alloy Martensitic Steel

Tang,

Zhao,

et al. 2024

steel research int.

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Low‐carbon martensitic steel is the key material of automobile lightweight. Unfortunately, the strategies for increasing the material strength, such as processing to create line defects (dislocations), tend to decrease the ductility. Herein, a strategy to circumvent this problem in an inexpensive, microalloy low‐carbon (0.32%) martensitic steel by regulating the accelerated cooling stop temperature after hot rolling is developed. Steel with fine austenite grains embedded in a highly dislocated martensite matrix is developed by cold rolling followed by saltwater quenching and low‐temperature tempering. This deformed process produces dislocation hardening, but retains high ductility both through the glide of intensive mobile dislocations. The proposed strategy provides a pathway for the development of high‐strength, high‐ductility materials.

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Heterostructure manipulation of Ti2AlNb alloy through directional induction heating: investigation of multi-scale deformation mechanisms in the O phase

Liu,

Yang,

Zhao

et al. 2023

International Journal of Plasticity

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Achieving high ductility of Ti2AlNb sheet without sacrificing the tensile strength without post heat treatment

Cited by 16 publications

References 31 publications

Effect of Scanning Strategies on the Microstructure and Mechanical Properties of Ti-22Al-25Nb Alloy Fabricated through Selective Laser Melting

Effect of Scanning Strategies on the Microstructure and Mechanical Properties of Ti-22Al-25Nb Alloy Fabricated through Selective Laser Melting

Effect of Controlled Rolling on the Strength and Toughness of Low‐Alloy Martensitic Steel

Heterostructure manipulation of Ti2AlNb alloy through directional induction heating: investigation of multi-scale deformation mechanisms in the O phase

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