Deformation mechanisms in a new disc superalloy at low and intermediate temperatures

Yuan, Yong; Gu, Yue Feng; Osada, Toshio; Zhong, Zhihong; Yokokawa, Toshio; Harada, Hiroshi

doi:10.1016/j.scriptamat.2012.03.042

Cited by 69 publications

(16 citation statements)

References 20 publications

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“…Dislocation pairs involving the creation of anti-phase boundary (APB) in the precipitates are usually observed in the samples deformed at low temperatures [28][29][30]. Our observations are also consistent with a previous study [31].…”

Section: Deformation Microstructuressupporting

confidence: 93%

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Enhanced strength at intermediate temperatures in a Ni-base disk superalloy with high Co addition

Yuan

Zhong

Yokokawa

et al. 2012

Materials Science and Engineering: A

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Section: Deformation Microstructuressupporting

confidence: 93%

“…We have proposed a model to describe the transition of deformation mechanisms at low and intermediate temperatures in disk superalloys [31]. In that model, it has been suggested that APB energy and SFE have great influence on the transition of deformation mechanisms.…”

Section: Discussion Of Deformation Mechanismsmentioning

confidence: 99%

Enhanced strength at intermediate temperatures in a Ni-base disk superalloy with high Co addition

Yuan

Zhong

Yokokawa

et al. 2012

Materials Science and Engineering: A

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“…The LSHR alloy combines the low solvus of ME3 brought about by the high Co content and the high refractory element content of Alloy 10 [24]. The comparatively high Co content lowers the solvus temperature to allow more flexible solution heat treatment and increases the strength by increasing mechanical twining during deformation at elevated temperatures due to the low stacking fault energy [25,26]. In this study, fatigue tests were conducted on the LSHR alloy at 650 o C, with a particular focus on studying the influence of the orientation-dependent GB oxide formation on fatigue crack initiation and propagation processes loading waveform with a load ratio of 0.1 was employed for the fatigue tests.…”

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confidence: 99%

Influence of orientation-dependent grain boundary oxidation on fatigue cracking behaviour in an advanced Ni-based superalloy

2015

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Fatigue tests have been conducted on an advanced disc Ni-based superalloy (Low Solvus, High Refractory (LSHR) alloy) at 650 o C in air under three-point bend loading to investigate the role of orientation-dependent grain boundary oxidation in crack initiation and early propagation. It is found that crack initiation occurs mainly from bulged grain boundary oxides, and cracks then predominantly propagate along the oxidised grain boundaries. These bulged oxides are extremely enriched in Co and preferentially form at the boundaries between high and low Schmid factor grains which are inclined normal to the applied tensile stress direction. Meanwhile, relatively flat/thin Ni/Ti/Al-rich oxide complexes also form at other grain boundaries, but they appear to be much less detrimental in fatigue crack initiation and propagation compared with the grain boundary bulged Co-rich oxide complexes.

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“…In those studies, the specimen was aged and subjected to thermal exposure at 700 °C for 7000 h, and the γ' precipitates had a size of 65 ± 11 nm. For the Ni-based superalloys, partial dislocations shearing the γ' precipitates and creating SFs in the γ' precipitates are important mechanisms [23][24][25][26][27], which depends on not only the materials characteristics but also on the deformation conditions.…”

Section: Discussionmentioning

confidence: 99%

Tensile and creep deformation of a newly developed Ni-Fe-based superalloy for 700 °C advanced ultra-supercritical boiler applications

Yuan

Zhong

et al. 2015

Met. Mater. Int.

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A new Ni-Fe-based superalloy, HT-X, has been developed for applications in 700°C advanced ultra-supercritical (A-USC) boilers. The HT-X alloy is subjected to various heat treatments. Tensile tests are conducted at room temperature (RT), 700°C and 750°C. Creep tests are carried out under conditions of 700°C/300 MPa and 750°C/150 MPa. After aging treatment, the yield strength of the HT-X alloy at RT and 750°C is 787 MPa and 624 MPa, respectively. When additional thermal exposure at 750°C for 5400 h is applied, the yield strength is decreased to 656 MPa at RT and 480 MPa at 700°C. For an aged specimen, the a/2<110> dislocation shearing process occurs when tensile testing is conducted at RT and 750°C. As the γ' precipitate size increases in the specimen that is thermally exposed at 750°C for 5400 h, Orowan bowing is the dominant dislocation process, and stacking faults develop in the γ' precipitates at both RT and 700°C. Dislocation slip combined with climb is the dominant mechanism under the creep testing conditions. The factors that affect the mechanical properties and deformation mechanisms are discussed.

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Deformation mechanisms in a new disc superalloy at low and intermediate temperatures

Cited by 69 publications

References 20 publications

Enhanced strength at intermediate temperatures in a Ni-base disk superalloy with high Co addition

Enhanced strength at intermediate temperatures in a Ni-base disk superalloy with high Co addition

Influence of orientation-dependent grain boundary oxidation on fatigue cracking behaviour in an advanced Ni-based superalloy

Tensile and creep deformation of a newly developed Ni-Fe-based superalloy for 700 °C advanced ultra-supercritical boiler applications

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