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He, S.
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (8/8 displayed)
- 2024Effect of grain boundary misorientation and carbide precipitation on damage initiation: a coupled crystal plasticity and phase field damage studycitations
- 2021The role of grain boundary ferrite evolution and thermal aging on creep cavitation of type 316H austenitic stainless steelcitations
- 2019Toughening epoxy syntactic foams with milled carbon fibres: mechanical properties and toughening mechanismscitations
- 2007Model identification and FE simulations: Effect of different yield loci and hardening laws in sheet forming
- 2007Model Identification and FE Simulations Effect of Different Yield Loci and Hardening Laws in Sheet Formingcitations
- 2005Finite element modeling of incremental forming of aluminium sheets
- 2005Model identification and FE simulations: effect of different yield loci and hardening laws in sheet forming
- 2005Effect of FEM choices in the modelling of incremental forming of aluminium sheets
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article
The role of grain boundary ferrite evolution and thermal aging on creep cavitation of type 316H austenitic stainless steel
Abstract
To understand the interaction between microstructural evolution and creep cavitation during stress relaxation at an elevated temperature, an ex-service AISI type 316H stainless steel sample containing both weld metal and heat affected zone (HAZ) from an advanced gas-cooled reactor was studied. Multiple techniques that include secondary electron microscopy, electron backscatter diffraction (EBSD), transmission electron microscopy (TEM) and plasma focused ion beam tomograph were used for microstructure and creep cavities characterisation. Although no creep cavities were observed in the weld metal, the HAZ was extensively creep cavitated. At randomly oriented grain boundaries, creep cavities are present and closely linked with M23C6 and ferrite precipitates formed during thermal aging. Less precipitation (e.g. absence of ferrite) and less creep cavitation were observed at Σ3 coincidence site lattice boundaries. During in-service aging, at random grain boundaries, M23C6 formation and growth cause the local elemental depletion of γ stabilisers and promote a phase transformation from austenite to ferrite. The crystallographic relationship between ferrite and austenite were also studied by EBSD and TEM. Ferrite precipitates formed during aging often grow into the austenite grain not expected by traditional nucleation and growth theory, likely due to physical constraints by the existing carbides at the grain boundaries. The formation and growth of creep cavities is closely associated with the M23C6 and ferrite formed on grain boundaries. This study highlights the importance of considering the effect of thermal aging in accelerating creep cavitation.