Modified Monkman–Grant relationship for austenitic stainless steel foils

Ali, Hishamuddin Mohd; Tamin, Mohd Nasir

doi:10.1016/j.jnucmat.2012.08.048

Cited by 19 publications

(2 citation statements)

References 17 publications

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“…There is a linear correspondence between the logarithmic applied stress and the logarithmic creep rupture lifetime. An inverse linear relationship is found between the creep rupture life and the creep rate by Monkman and Grant, which is named as the Monkman-Grant relationship (Ali and Tamin, 2013). A constant (M ∼ 0.09) is obtained.…”

Section: Creep Behaviormentioning

confidence: 93%

Creep Behavior of Near α High Temperature Ti-6.6Al-4.6Sn-4.6Zr-0.9Nb-1.0Mo-0.32Si Alloy

et al. 2021

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This study focuses on the microstructure characteristics and tensile and creep properties of a near α high temperature Ti-6.6Al-4.6Sn-4.6Zr-0.9Nb-1.0Mo-0.32Si alloy. Microstructure characteristics were quantitatively investigated using optical microscopy, scanning electron microscope, and transmission electron microscopy. Tensile properties were carried out at room and high temperature. Creep properties were detected under applied stresses ranging from 100–350 MPa at 873–973 K, respectively. Results showed that Widmanstätten microstructure was obtained after hot forged and heat treatment. The strength decreases and the elongation rises with temperature increasing. The ultimate strength and elongation were 1010 MPa, 12% at room temperature, and 620 MPa, 20% at 923 K, respectively. The steady state creep rates rise correspondingly with stress and temperature. Stress exponents are measured within the range of 3.0–3.5. Thus, the creep mechanism is diffusion-controlled viscous glide of dislocation. Ti3Al precipitates are observed. The boundaries and precipitates can obstruct dislocation movement to improve the creep properties. Fracture mechanism of creep is intergranular. The creep mechanism varied from climb of dislocation to sliding of dislocation solution.

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Section: Creep Behaviormentioning

confidence: 93%

Creep Behavior of Near α High Temperature Ti-6.6Al-4.6Sn-4.6Zr-0.9Nb-1.0Mo-0.32Si Alloy

et al. 2021

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“…C MG and C MMG are regarded as constants independent of temperature and applied stress for the particular alloy. [9,11,12] Hassan et al [13] pointed out that MGR is suitable for alloys where the secondary creep stage is the main creep stage, while MMGR is more suitable for alloys when the tertiary stage becomes the main creep stage. In the case of PM superalloys with outstanding high-temperature performance, the prevailing phenomenon typically manifests as the predominance of the tertiary creep stage.…”

Section: Introductionmentioning

confidence: 99%

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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