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behaviour in type 316H stainless steel at 650°C using high-temperature mechanical testing and neutron diffraction. A cyclic creep experiment was conducted in-situ at a neutron diffraction beamline, during which various degrees of unloading and reverse loading were applied to the specimen, followed by creep deformation under a load above the material’s yield strength. Partial PCR was observed after reverse plastic loading for all the creep dwells,
which is contrary to current high-temperature lifetime assessment’s procedures advice which is to account for full recovery of primary creep after any reverse plastic loading. The extent of PCR is observed to be proportional to the magnitude of reverse plastic strain up to a level of 0.5% reverse plastic strain. From the measured neutron diffraction data, a strong correlation was observed between the changes in magnitude of the accumulated micro residual lattice strains and the macroscopic primary creep strain. Moreover, the increases of
micro lattice strain to saturation and transition from primary creep to secondary regime occur at the same time. Based on these correlations it can be postulated that the macroscopic PCR behaviour observed due to cyclic loading in type 316H stainless steel at elevated temperature originates from the accumulation of residual lattice strains during the reverse plastic loading and those time-dependent changes during the creep dwells.
- stainless steel
- neutron diffraction
- deformation micromechanism
FingerprintDive into the research topics of 'A novel insight into the primary creep regeneration behaviour of a polycrystalline material at high-temperature using in-situ neutron diffraction'. Together they form a unique fingerprint.
- 1 Active
1/04/18 → 30/03/22
Susan L Pywell (Manager), Simon A Burbidge (Other), Polly E Eccleston (Other) & Simon H Atack (Other)