Effect of heat treatment variations on the microstructure evolution and mechanical properties in a β metastable Ti alloy

Li, C.; Chen, J.; Li, W.; Ren, Yan; He, Jing; Song, Zhuman

doi:10.1016/j.jallcom.2016.05.225

Cited by 38 publications

(13 citation statements)

References 18 publications

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“…However, the improvement of strength is usually accompanied by a decrease in ductility, resulting from unexpected microstructural characteristics, such as grain boundary α [11,12]. Generally, an excellent combination of strength and ductility is strongly dependent on size, morphology, and distribution of secondary α phase [13].…”

Section: Introductionmentioning

confidence: 99%

Evolution of Secondary α Phase during Aging Treatment in Novel near β Ti-6Mo-5V-3Al-2Fe Alloy

et al. 2018

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Evolution of secondary α phase during aging treatment of a novel near β titanium alloy Ti-6Mo-5V-3Al-2Fe(wt.%) was studied by OM, SEM, and TEM. Results indicated that size and distribution of secondary α phase were strongly affected by aging temperature and time. Athermal ω phase formed after super-transus solution treatment followed by water quenching, and promoted nucleation of needle-like intragranular α in subsequent aging process. When aged at 480 °C, fine scaled intragranular α with small inter-particle spacing precipitated within β grains and high ultimate tensile strength above 1500 MPa was achieved. When the aging temperature increased, the size and inter-particle spacing of intragranular α increased and made the strength reduce, but the ductility got improved. When aging temperature reached as high as 600 °C, ω phase disappeared and intragranular α coarsened obviously, resulting in serious decrease of strength. While mutually parallel Widmanstätten α laths formed at the vicinity of β grain boundaries and grew into the internal area of β grains, and significant improvement of ductility was achieved. As the aging time increased from 4 h to 16 h at 600 °C, the intragranular α grew slightly and brought about minor change of mechanical properties.

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Section: Introductionmentioning

confidence: 99%

Evolution of Secondary α Phase during Aging Treatment in Novel near β Ti-6Mo-5V-3Al-2Fe Alloy

et al. 2018

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“…Under the action of external stress, metastable β-phase can produce martensitic transformation. Through the study of Ti-Ta [7], Ti-V [8], Ti-Mo [9], Ti-Nb [10], Ti-10V-2Fe-3Al [11,12], and β-Cez [13] alloys, it was found that the stress-induced martensitic transformation in titanium alloys exhibits double yield points on the stress-strain curve, as shown in Fig. 1.…”

Section: Introductionmentioning

confidence: 99%

Influence of grain size on the triggering stress of stress-induced martensitic transformation and related mechanical properties in two newly developed Ti alloys

Li¹,

Zhu²,

Xiao³

et al. 2020

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The β grain growth behavior of two newly developed titanium alloys with composition Ti-10V-1Fe-3Al and Ti-10V-2Cr-3Al (wt.%) isothermally annealed at 900 • C for a different time was studied, and its effect on the triggering stress of stress-induced martensitic (SIM) transformation and related mechanical properties was evaluated. The results show that the grain size increases with the increase of annealing time. The measured grain size of Ti-10V-1Fe--3Al alloy is larger than that of Ti-10V-2Cr-3Al alloy under the same annealing conditions. The increase of the grain size leads to an increase of the triggering stress resulting in the martensitic transformation. The work hardening ability and compressive failure strain of the studied alloys decrease rapidly.

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“…Therefore, it is vitally significant to improve the power generation efficiency, reduce the cost, and increase service life of the solar thermal power generation system. However, as the key component of CSP, the heat exchange tube should be paid more attention [3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Effect of Laser Shock Processing and Aluminizing on Microstructure and High-Temperature Creep Properties of 321 Stainless Steel for Solar Thermal Power Generation

Huang

et al. 2020

International Journal of Photoenergy

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The aluminized layer of 321 stainless steel was treated by laser shock processing (LSP). The effects of constituent distribution and microstructure change of the aluminized layer in 321 stainless steel on creep performance at high temperature were investigated. SEM and EDS results reveal that aluminized coating is mainly composed of an Al 2 O 3 outer layer, the transition layer of the Fe-Al phase, and the diffusion layer. Additionally, LSP conducted on coating surface not only improves the density of the layer structure, resulting in an increment on the bonding strength of both infiltration layer and substrate, but also leaves higher residual compressive stress in the aluminized layer which improves its creep life effectively. Experimental results indicate that the microhardness of the laser-shocked region is improved strongly by the refined grains and the reconstruction of microstructures. Meanwhile, the roughness and microhardness of aluminized steel are found to increase with the laser impact times. On the other hand, the intermetallic layers, whose microstructure is stable enough to inhibit crack initiation, reinforce strength greatly. The anticreep life of aluminized sample with three times LSP was increased by 232.1% as compared to aluminized steel, which could attribute to the increased dislocation density in the peened sample as well as the decrease of creep voids in size and density.

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Effect of heat treatment variations on the microstructure evolution and mechanical properties in a β metastable Ti alloy

Cited by 38 publications

References 18 publications

Evolution of Secondary α Phase during Aging Treatment in Novel near β Ti-6Mo-5V-3Al-2Fe Alloy

Evolution of Secondary α Phase during Aging Treatment in Novel near β Ti-6Mo-5V-3Al-2Fe Alloy

Influence of grain size on the triggering stress of stress-induced martensitic transformation and related mechanical properties in two newly developed Ti alloys

Effect of Laser Shock Processing and Aluminizing on Microstructure and High-Temperature Creep Properties of 321 Stainless Steel for Solar Thermal Power Generation

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