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Yan, Kun
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Topics
Publications (16/16 displayed)
- 2022Creep deformation phenomena in near-surface carburised layers of 316H stainless steels
- 2022Creep performance of carburized 316H stainless steel at 550°Ccitations
- 2022The Mechanical Performance of Additively Manufactured 316L Austenitic Stainless Steelcitations
- 2021Solidification microstructure and residual stress correlations in direct energy deposited type 316L stainless steelcitations
- 2021Oxidation and carburization behaviour of two type 316H stainless steel casts in simulated AGR gas environment at 550 and 600 °Ccitations
- 2019Deformation Mechanisms of Twinning-Induced Plasticity Steel Under Shock-Load: Investigated by Synchrotron X-Ray Diffractioncitations
- 2018Investigating nano-precipitation in a V-containing HSLA steel using small angle neutron scatteringcitations
- 2016In situ synchrotron X-ray diffraction studies of the effect of microstructure on tensile behavior and retained austenite stability of thermo-mechanically processed transformation induced plasticity steelcitations
- 2014Martensitic phase transformation and deformation behavior of Fe-Mn-C-Al twinning-induced plasticity steel during high-pressure torsioncitations
- 2013Defect dynamics in polycrystalline zirconium alloy probed in situ by primary extinction of neutron diffractioncitations
- 2012Characterization of superelasticity in a new Fe-based shape memory alloy using neutron and synchrotron radiation
- 2012Hot deformation of cast and extruded TiAl:An in-situ diffraction studycitations
- 2011Phase transition and ordering behavior of ternary Ti-Al-Mo alloys using in-situ neutron diffractioncitations
- 2009From single grains to texturecitations
- 2009In situ observation of dynamic recrystallization in the bulk of zirconium alloycitations
- 2009In situ study of dynamic recrystallization and hot deformation behavior of a multiphase titanium aluminide alloycitations
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article
Creep performance of carburized 316H stainless steel at 550°C
Abstract
The creep behaviour of two ex-service type 316H austenitic stainless steel casts with different Mn contents and austenite grain size, that were pre-carburized for either 8000 h at 550°C or 3000 h at 600°C in simulated CO2-rich gas environment of UK Advanced Gas-cooled Reactors, was evaluated by uniaxial creep testing at 550°C in air. The low Mn (0.98 wt.%) steel grade with an average austenite grain size of 142±110 µm presents a higher creep deformation rate and creep ductility compared to the high Mn (1.52 wt.%) steel cast with an austenite grain size of 81±67µm. Below an applied stress of 318 MPa, the presence of the sub-surface carburized layer reduces the minimum creep rate, likely due to the significantly modified material properties of the carburized layer and the presence of local compressive stresses. The stress exponent determined for the high Mn steel carburized at 600°C (n=9.6), and its reference non-carburized microstructure (n=9.8), identifies the dominant creep mechanism to be dislocation climb & glide. However, crack evolution through M23C6-decorated grain boundaries within the carburized layer was observed in all the tested material's conditions at creep strains of 0.50%. The average crack length increases with creep strain and attains values close to the carburized layer thickness at creep strains of ε≥1.00%. The prevalence and size of cracking increases with the local hardness carburized layer depth. At applied stresses σ≥318 MPa, cracking on-loading prior to forward creep already occurs in the carburized layer, leading to a sharp increase in minimum creep rates of carburized specimens. These results demonstrate the impact a relatively thin layer of modified material can have on the materials creep performance; emphasises the requirement to consider the effects of the service environment in structural assessment procedures, particularly for high temperature applications including Generation IV and advanced modular reactor designs.