Peer-Reviewed Journal Details
Mandatory Fields
O'Hara, EM,Harrison, NM,Polomski, BK,Barrett, RA,Leen, SB
2018
November
Fatigue & Fracture Of Engineering Materials & Structures
The effect of inclusions on the high-temperature low-cycle fatigue performance of cast MarBN: Experimental characterisation and computational modelling
Published
Optional Fields
critical plane fatigue crack initiation high-temperature low-cycle fatigue inclusions MarBN MARTENSITIC STEEL CREEP-PROPERTIES FINITE-ELEMENT POWER-PLANTS DAMAGE BEHAVIOR MECHANISMS INITIATION STRENGTH JOINTS
41
2288
2304
The presence of inclusions is a known source of crack initiation and component failure in cast materials. In this work, the role of inclusions is investigated via a combined program of high-temperature low-cycle fatigue testing and computational modelling of a tempered martensitic steel, MarBN. Microstructural analysis has shown that manufacturing-induced oxide inclusions are a key source of fatigue crack initiation. A fully coupled, critical plane life prediction and damage model is implemented in a unified cyclic viscoplastic user-material subroutine and applied to predict damage and micro-crack initiation for inclusions. It is deduced that more careful control of the development of inclusions in the manufacturing process will provide enhanced material and component performance for highly flexible and ultrasupercritical plant conditions.
10.1111/ffe.12864
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