Microstructure evolution and creep behavior of near-¡ Ti alloy produced by thermomechanical processing

Haruki Masuyama, Kei Shimagami, Yoshiaki Toda, Tetsuya Matsunaga, Tsutomu Ito, Masayuki Shimojo, Yoko Yamabe-Mitarai

研究成果: Article

抄録

A microstructure evolution based on the processing and heat-treatment conditions was investigated for Ti-13Al-2Nb-2Zr (at%) alloy, which has a promising oxidation resistance. Three processing temperatures, 900°C and 1000°C in the ¡+¢ phase field, and 1080°C in the ¢ phase field, and two rolling reduction ratios, 93% and 67%, were selected as the processing conditions. In the samples processed and heat-treated in the ¡+¢ phase field, an almost fully equiaxed structure, i.e., the equiaxed or ellipsoid ¡ phase surrounded by the ¢ phase, was formed through furnace cooling, and a bi-modal structure was formed using air cooling. The morphology of the ¡ phase in the near fully equiaxed and lamellar structure depends on the rolling reduction ratio; in other words, the equiaxed and ellipsoid ¡ phases are formed at rolling reduction ratios of 93% and 67%, respectively. The volume fraction of the equiaxed ¡ phase in the bi-modal structure is processed at 900°C, which is higher than that of the bi-modal structure processed at 1000°C despite the same heat-treatment temperature applied. This is because the induced strain when processed at 1000°C is smaller than that when processed at 900°C. By contrast, in the samples processed in the ¢ phase field and heat-treated in either the ¡+¢ or ¢ phase field, a lamellar structure is formed. The creep behavior of the bi-modal structure obtained upon processing at 900°C and 1000°C for up to a 93% rolling reduction ratio was investigated. The creep life of the sample processed at 1000°C was two-times longer than the sample processed at 900°C. This is because a smaller volume fraction of the equiaxed ¡ phase in the sample processed at 1000°C than that of the sample processed at 900°C.

元の言語English
ページ(範囲)2336-2345
ページ数10
ジャーナルMaterials Transactions
60
発行部数11
DOI
出版物ステータスPublished - 2019 1 1

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Creep
microstructure
Microstructure
Lamellar structures
Processing
Volume fraction
Heat treatment
ellipsoids
Cooling
Oxidation resistance
heat treatment
air cooling
heat
Furnaces
oxidation resistance
Temperature
furnaces
Air
cooling
temperature

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

これを引用

Microstructure evolution and creep behavior of near-¡ Ti alloy produced by thermomechanical processing. / Masuyama, Haruki; Shimagami, Kei; Toda, Yoshiaki; Matsunaga, Tetsuya; Ito, Tsutomu; Shimojo, Masayuki; Yamabe-Mitarai, Yoko.

:: Materials Transactions, 巻 60, 番号 11, 01.01.2019, p. 2336-2345.

研究成果: Article

Masuyama, H, Shimagami, K, Toda, Y, Matsunaga, T, Ito, T, Shimojo, M & Yamabe-Mitarai, Y 2019, 'Microstructure evolution and creep behavior of near-¡ Ti alloy produced by thermomechanical processing', Materials Transactions, 巻. 60, 番号 11, pp. 2336-2345. https://doi.org/10.2320/matertrans.MT-MAW2019010
Masuyama, Haruki ; Shimagami, Kei ; Toda, Yoshiaki ; Matsunaga, Tetsuya ; Ito, Tsutomu ; Shimojo, Masayuki ; Yamabe-Mitarai, Yoko. / Microstructure evolution and creep behavior of near-¡ Ti alloy produced by thermomechanical processing. :: Materials Transactions. 2019 ; 巻 60, 番号 11. pp. 2336-2345.
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abstract = "A microstructure evolution based on the processing and heat-treatment conditions was investigated for Ti-13Al-2Nb-2Zr (at{\%}) alloy, which has a promising oxidation resistance. Three processing temperatures, 900°C and 1000°C in the ¡+¢ phase field, and 1080°C in the ¢ phase field, and two rolling reduction ratios, 93{\%} and 67{\%}, were selected as the processing conditions. In the samples processed and heat-treated in the ¡+¢ phase field, an almost fully equiaxed structure, i.e., the equiaxed or ellipsoid ¡ phase surrounded by the ¢ phase, was formed through furnace cooling, and a bi-modal structure was formed using air cooling. The morphology of the ¡ phase in the near fully equiaxed and lamellar structure depends on the rolling reduction ratio; in other words, the equiaxed and ellipsoid ¡ phases are formed at rolling reduction ratios of 93{\%} and 67{\%}, respectively. The volume fraction of the equiaxed ¡ phase in the bi-modal structure is processed at 900°C, which is higher than that of the bi-modal structure processed at 1000°C despite the same heat-treatment temperature applied. This is because the induced strain when processed at 1000°C is smaller than that when processed at 900°C. By contrast, in the samples processed in the ¢ phase field and heat-treated in either the ¡+¢ or ¢ phase field, a lamellar structure is formed. The creep behavior of the bi-modal structure obtained upon processing at 900°C and 1000°C for up to a 93{\%} rolling reduction ratio was investigated. The creep life of the sample processed at 1000°C was two-times longer than the sample processed at 900°C. This is because a smaller volume fraction of the equiaxed ¡ phase in the sample processed at 1000°C than that of the sample processed at 900°C.",
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T1 - Microstructure evolution and creep behavior of near-¡ Ti alloy produced by thermomechanical processing

AU - Masuyama, Haruki

AU - Shimagami, Kei

AU - Toda, Yoshiaki

AU - Matsunaga, Tetsuya

AU - Ito, Tsutomu

AU - Shimojo, Masayuki

AU - Yamabe-Mitarai, Yoko

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N2 - A microstructure evolution based on the processing and heat-treatment conditions was investigated for Ti-13Al-2Nb-2Zr (at%) alloy, which has a promising oxidation resistance. Three processing temperatures, 900°C and 1000°C in the ¡+¢ phase field, and 1080°C in the ¢ phase field, and two rolling reduction ratios, 93% and 67%, were selected as the processing conditions. In the samples processed and heat-treated in the ¡+¢ phase field, an almost fully equiaxed structure, i.e., the equiaxed or ellipsoid ¡ phase surrounded by the ¢ phase, was formed through furnace cooling, and a bi-modal structure was formed using air cooling. The morphology of the ¡ phase in the near fully equiaxed and lamellar structure depends on the rolling reduction ratio; in other words, the equiaxed and ellipsoid ¡ phases are formed at rolling reduction ratios of 93% and 67%, respectively. The volume fraction of the equiaxed ¡ phase in the bi-modal structure is processed at 900°C, which is higher than that of the bi-modal structure processed at 1000°C despite the same heat-treatment temperature applied. This is because the induced strain when processed at 1000°C is smaller than that when processed at 900°C. By contrast, in the samples processed in the ¢ phase field and heat-treated in either the ¡+¢ or ¢ phase field, a lamellar structure is formed. The creep behavior of the bi-modal structure obtained upon processing at 900°C and 1000°C for up to a 93% rolling reduction ratio was investigated. The creep life of the sample processed at 1000°C was two-times longer than the sample processed at 900°C. This is because a smaller volume fraction of the equiaxed ¡ phase in the sample processed at 1000°C than that of the sample processed at 900°C.

AB - A microstructure evolution based on the processing and heat-treatment conditions was investigated for Ti-13Al-2Nb-2Zr (at%) alloy, which has a promising oxidation resistance. Three processing temperatures, 900°C and 1000°C in the ¡+¢ phase field, and 1080°C in the ¢ phase field, and two rolling reduction ratios, 93% and 67%, were selected as the processing conditions. In the samples processed and heat-treated in the ¡+¢ phase field, an almost fully equiaxed structure, i.e., the equiaxed or ellipsoid ¡ phase surrounded by the ¢ phase, was formed through furnace cooling, and a bi-modal structure was formed using air cooling. The morphology of the ¡ phase in the near fully equiaxed and lamellar structure depends on the rolling reduction ratio; in other words, the equiaxed and ellipsoid ¡ phases are formed at rolling reduction ratios of 93% and 67%, respectively. The volume fraction of the equiaxed ¡ phase in the bi-modal structure is processed at 900°C, which is higher than that of the bi-modal structure processed at 1000°C despite the same heat-treatment temperature applied. This is because the induced strain when processed at 1000°C is smaller than that when processed at 900°C. By contrast, in the samples processed in the ¢ phase field and heat-treated in either the ¡+¢ or ¢ phase field, a lamellar structure is formed. The creep behavior of the bi-modal structure obtained upon processing at 900°C and 1000°C for up to a 93% rolling reduction ratio was investigated. The creep life of the sample processed at 1000°C was two-times longer than the sample processed at 900°C. This is because a smaller volume fraction of the equiaxed ¡ phase in the sample processed at 1000°C than that of the sample processed at 900°C.

KW - Bi-modal microstructure

KW - Creep test

KW - Deformation mechanism

KW - Equiaxed ¡

KW - Thermomechanical processing

KW - Titanium alloy

KW - ¡+¢ phase

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