Influence of hold type and duration on cyclic deformation behaviour of IN740H

Singh, R K and Sahu, J K (2019) Influence of hold type and duration on cyclic deformation behaviour of IN740H. Materials Science and Technology, 35(4) . pp. 488-499.

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Abstract

The superimposition of time-dependent damage on fatigue, otherwise, known as creep-fatigue interaction (CFI), significantly affect the fatigue life of power plant boiler components. IN740H is a candidate material for advanced ultra-supercritical (A-USC) boilers components. The creep-fatigue interaction of alloy IN740H was studied at 760°C, by conducting low cycle fatigue (LCF) at a strain amplitude (Δϵt/2) value of 0.4% and holding at peak strain in tension, compression and both for 0, 1, 5, 10 and 30 min duration. Though hold time adversely affects fatigue life, tensile hold is the most damaging of all three hold modes. The reason behind maximum damage with tensile hold is grain boundary cavitations and coalescence of cavities leading to internal cracks formation at grain boundaries.

Item Type:Article
Official URL/DOI:https://doi.org/10.1080/02670836.2019.1570662
Uncontrolled Keywords:IN740H;creep-fatigue interaction;low cycle fatigue;cyclic deformation micromechanism
Divisions:Material Science and Technology
ID Code:8004
Deposited By:Sahu A K
Deposited On:30 Sep 2019 16:21
Last Modified:30 Sep 2019 16:21
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