Orientation control of a lamellar microstructure in a Ti−Al intermetallic compound by high-temperature compression in an alpha single-phase and/or in a two-phase region and the alpha re-heat treatment

Park, Kyu Seop; Bae, Dong‐Sik; Lee, Goo Hyun; Lee, Sung Keun

doi:10.1007/bf03027498

Cited by 7 publications

(1 citation statement)

References 11 publications

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“…However, there remain some uncertainties with regard to the application of the theory to alloys such as Ti-6Al-4V because the approach is formally applicable to only single-phase materials. Hence, research to verify whether the inelastic deformation theory can be extended to two-phase materials would be beneficial [19,20]. To this end, the present work was undertaken to clarify the individual effects of ␣-␣ and ␣-␤ boundaries in Ti-6Al-4V on deformation at high temperature within the framework of the internal-variable theory.…”

Section: Introductionmentioning

confidence: 98%

High-temperature deformation and grain-boundary characteristics of titanium alloys with an equiaxed microstructure

Kim

Semiatin

Lee

2008

Materials Science and Engineering: A

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Section: Introductionmentioning

confidence: 98%

High-temperature deformation and grain-boundary characteristics of titanium alloys with an equiaxed microstructure

Kim

Semiatin

Lee

2008

Materials Science and Engineering: A

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Creep modeling for life evaluation and strengthening mechanism of tungsten alloyed 9–12% Cr steels

et al. 2006

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Recently, high strength tungsten (W) alloyed steels have been developed for use in power plants with higher steam conditions for environmental reasons as well as the improvement of thermal efficiency resulting in lower fuel costs. In order to establish a creep modeling of high strength martensitic steel and to understand the basic role of W in tungsten alloyed 9-12Cr steels, conventional martensitic steels (X20CrMoV121, X20CrMoWV121, and Mod.9Cr-1Mo) and tungsten alloyed steels (NF616 and HCM12A) were employed for creep tests and creep behavior analyses by the : method. The proposed creep model, which takes into account both primary and tertiary creep, satisfactorily described the creep curves and accurately predicted creep life, as martensitic steel undergoes a relatively large amount of primary creep, up to nearly 30 %, over its normal life. The tungsten alloyed steels exhibited a smaller minimum creep rate and a larger stress exponent compared to the conventional steels. In addition, in tungsten alloyed steel, the : value features strong stress dependence such that creep life is prolonged at lower stresses due to high : values. The importance of the : value from the standpoint of creep strengthening in primary and tertiary creep is discussed.

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Deformation behavior of TiAl intermetallic compounds and orientation control by reactive diffusion and high-temperature uniaxial compression deformation

et al. 2006

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To determine the optimum method of producing TiAl intermetallic compounds with an oriented lamellar microstructure, the authors applied reactive diffusion and high-temperature deformation in a two-phase state on Ti-43 mol.%Al and Ti-46 mol.%Al. The reactive diffusion process produces an D single-phase state with orientations that reflect the texture of the starting titanium foils; the high-temperature deformation aims to rotate the lamellar interface by means of preferential activation of the crystal slip systems that are parallel to the interface. The reactive diffusion process can effectively control the texture in an D single-phase state, though many voids are formed at the initial stages of reactive diffusion. Furthermore, after the heating process for the construction of the lamellar microstructure, uniaxial compression at 1323 K is quite effective for ensuring that the lamellar interface is rotated parallel to the compression plane. Finally, the deformation causes about one half of all the lamellae to be arranged within 20 degrees of the compression plane.

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Orientation control of a lamellar microstructure in a Ti−Al intermetallic compound by high-temperature compression in an alpha single-phase and/or in a two-phase region and the alpha re-heat treatment

Cited by 7 publications

References 11 publications

High-temperature deformation and grain-boundary characteristics of titanium alloys with an equiaxed microstructure

High-temperature deformation and grain-boundary characteristics of titanium alloys with an equiaxed microstructure

Creep modeling for life evaluation and strengthening mechanism of tungsten alloyed 9–12% Cr steels

Deformation behavior of TiAl intermetallic compounds and orientation control by reactive diffusion and high-temperature uniaxial compression deformation

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