Refurbishment of Creep Damage Using Re-Heat Process for Ni-Based Superalloy under Bending Load

Sekihara, Masaru; Ichikawa, Kouji; Imano, Shinya; Kagiya, Yukio; Ito, Akihiro; Chuujou, Kouji

doi:10.2472/jsms.60.202

Cited by 2 publications

(1 citation statement)

References 7 publications

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“…There are many research works [10][11][13][14][15][16][17][18][19][20][21][22][23][24][25] investigating the effect of reheat treatment conditions on the obtained microstructure in cast nickel-based superalloys of various grades, including works [1,[21][22][23][24][25][26][27][28][29][30][31][32] on Inconel 738. The previous studies [1] indicated that the proper reheat treatment procedure should include solutionizing Inconel 738 in the temperature range of 1,398-1,478 K for 7.2-21.6 ks followed by a rapid gas quench (25 K to 55 K/min.…”

Section: Introductionmentioning

confidence: 99%

Effect of Reheat Treatment on Microstructural Refurbishment and Hardness of the As-cast Inconel 738

Wongbunyakul¹,

Visuttipitukkul²,

Wangyao³

et al. 2014

High Temperature Materials and Processes

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This work investigates the effect of rejuvenation heat treatment conditions for refurbishment of the longterm serviced gas turbine blades, which were made of as-cast nickel base superalloy grade, Inconel 738. The reheat treatment conditions consist of solutionizing treatments at temperatures of 1,438, 1,458 and 1,478 K for 14.4 ks and aging treatments at temperatures of 1,133, 1,148 and 1,163 K for 43.2, 86.4, 129.6 and 172.8 ks. The results show that increase in aging times results in continuous increase of size and area fraction of gamma prime (γ′) particles. The higher solutionizing temperature leads to the lower area fraction and smaller size of gamma prime particles. Regarding the microstructure characteristics, the most proper reheat treatment condition should be solutionizing at temperature of 1,438 K for 14.4 ks and aging at temperature of 1,133 K for 172.8 ks, which provides the highest area fraction of gamma prime particles in proper size.

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Section: Introductionmentioning

confidence: 99%

Effect of Reheat Treatment on Microstructural Refurbishment and Hardness of the As-cast Inconel 738

Wongbunyakul¹,

Visuttipitukkul²,

Wangyao³

et al. 2014

High Temperature Materials and Processes

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Creep Damage Repair of a Nickel-Based Single Crystal Superalloy Based on Heat Treatment

Wang

Lian

Wang

et al. 2021

Metals

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Taking nickel-based single crystal superalloy DD6 as the research object, different degrees of creep damage were prefabricated by creep interruption tests, and then the creep damage was repaired by the restoration heat treatment system of solid solution heat treatment and two-stage aging heat treatment. The results show that with the creep time increasing, the alloy underwent microstructure evolution including γ′ phase coarsening, N-type rafting and de-rafting. After the restoration heat treatment, the coarse rafted γ′ phase of creep damaged specimens dissolved, precipitated, grew up, and became cubic again. Except for the specimens with creep interruption of 100 h, the γ′ phase can basically achieve the same arrangement as the γ′ phase of the original sample. The comparison of the secondary creep test shows that the steady-state creep stage of the test piece after the restoration heat treatment is relatively increased, and the total creep life can reach the same level as the primary creep life. The high temperature creep properties of the tested alloy are basically recovered, and the restoration heat treatment effect is good.

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Refurbishment of Creep Damage Using Re-Heat Process for Ni-Based Superalloy under Bending Load

Cited by 2 publications

References 7 publications

Effect of Reheat Treatment on Microstructural Refurbishment and Hardness of the As-cast Inconel 738

Effect of Reheat Treatment on Microstructural Refurbishment and Hardness of the As-cast Inconel 738

Creep Damage Repair of a Nickel-Based Single Crystal Superalloy Based on Heat Treatment

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