Enhancing the Creep Strength of Next-Generation Disk Superalloys via Local Phase Transformation Strengthening

Smith, Timothy M.; Gabb, Timothy P.; Wertz, K. N.; Stuckner, Joshua; Evans, Laura J.; Egan, Ashton; Mills, Michael J.

doi:10.1007/978-3-030-51834-9_70

Cited by 12 publications

(3 citation statements)

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“…Previous work had shown that the microstructure stability and creep properties of the alloy are excellent. [ 21,22 ] The target operating temperature of the novel alloy is 815 °C, the same as the reported ME501 [ 23 ] and TNSA1, [ 3 ] and it belongs to the next generation of PM superalloys for disks. The influence of temperature and stress on the creep behavior was examined, and the creep data were used to discuss the MGR.…”

Section: Introductionmentioning

confidence: 80%

“…Since turbine disks are subjected to both high temperature and stress during service, the high-temperature creep rupture and damage to alloys have received extensive attention. [1,[3][4][5] The growth of creep damage is reflected in the increase of the creep rate and leads to the fracture of the alloy. [6] The relationship between steady-state creep rate εs (or minimum creep rate εm ) and creep life t r has been described by the Monkman-Grant relation (MGR) in 1956.…”

Section: Introductionmentioning

confidence: 99%

“…Since turbine disks are subjected to both high temperature and stress during service, the high‐temperature creep rupture and damage to alloys have received extensive attention. [ 1,3–5 ]…”

Section: Introductionmentioning

confidence: 99%

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High‐Temperature Creep Behavior and Damage Mechanism of an Advanced Powder Metallurgy Ni‐Based Superalloy

Li,

Zhang,

et al. 2024

Adv Eng Mater

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The creep behavior of a novel PM Ni‐based superalloy was investigated at temperatures ranging from 760 °C to 815 °C and stress levels in the 480 MPa‐620 MPa. The steady‐state creep rate, strain to rupture, and rupture time were analyzed based on the Monkman‐Grant relation and the modified Monkman‐Grant relation. The creep damage factor was redefined by the analysis of Monkman‐Grant ductility. A general relationship between the time reaching Monkman‐Grant ductility and creep life was established. The sharply accelerated creep stage was proposed and the modified Monkman‐Grant relation of the transient creep parameters in this stage was established. The nucleation, growth and connection of grain boundary creep cavities dominated the creep damage of the alloy. The stress concentration caused by the accumulation of dislocations at grain boundaries and σ phase interfaces, and the grain boundary slipping were the main reason for the nucleation of grain boundary cavities. The coupling effect of the temperature and the stress aggravates the damage of grain boundary and the degradation of microstructure.This article is protected by copyright. All rights reserved.

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Section: Introductionmentioning

confidence: 80%