Anelasticity in austenitic stainless steel

Rao, Ashwin; Bouchard, P. J.; Northover, Shirley; Fitzpatrick, Michael E.

doi:10.1016/j.actamat.2012.08.060

Cited by 26 publications

(14 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The current in situ constant load creep results are also different to the in situ neutron diffraction creep experiments conducted by Rao et al [11] in spite of similar macroscopic creep strain (*0.62%) generated from similar duration (12 h) of primary creep stage. Rao et al [11] observed that the {200} grain family developed significant tensile creep strain (evolved from 0 to 850 microstrain) while the {111} and {220} developed compressive creep strains (evolved from 0 to -275 microstrain) during primary creep stage (180 MPa at 650°C) in a solute heat-treated 316H austenitic stainless steel sample. This could be due to large number of carbides (10 21 m -3 ) that can form along the grain boundaries, the slip planes and other entities within grain during the creep of the solution heat-treated sample at 650°C [22].…”

Section: Resultscontrasting

confidence: 48%

“…The dislocation pinning therefore can change the internal resistance of each crystal plane [23], resulting in changing and redistribution of the lattice strain between grain families during creep deformation. Moreover, it is difficult to consider the change in stress-free lattice spacing due to solid solution carbon concentration [11].…”

Section: Resultsmentioning

confidence: 99%

“…Creep as a time-dependent plastic deformation can also generate intergranular strains/stresses in Type 316H austenitic stainless steel often during primary stage of the constant load creep [10][11][12]. This is due to creep occurring differently along different crystalline planes, thereby creating strain incompatibilities between grain families.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effect of boundary conditions on the evolution of lattice strains in a polycrystalline austenitic stainless steel

et al. 2017

View full text Add to dashboard Cite

The effect of boundary conditions (constant load, constant strain and elastic follow-up) on lattice strain evolution during creep in a polycrystalline austenitic stainless steel was studied using in situ neutron diffraction at 550°C. The lattice strains were found to remain constant under constant load control. However, under constant strain and elastic follow-up control, the lattice strains relaxed the most in the elastically softest lattice plane {200} and the least in the elastically stiffest lattice plane {111}. The intergranular stresses created between different grain families were constant during creep tests irrespective of the boundary conditions with the initial applied stresses of 250 MPa.

show abstract

Section: Resultscontrasting

confidence: 48%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effect of boundary conditions on the evolution of lattice strains in a polycrystalline austenitic stainless steel

et al. 2017

View full text Add to dashboard Cite

show abstract

“…The grain-to-grain misfit stress is created by the orientation dependent elastic and plastic deformation within a polycrystalline material [105][106][107] . Rao et al 34,108 attributed the presence of anelastic strain recovery in creep to Type II residual stress. Here, the residual stress clearly takes the meaning of an internal stress term.…”

Section: Conceptmentioning

confidence: 99%

A review of the changes of internal state related to high temperature creep of polycrystalline metals and alloys

Chen

Flewitt

Cocks

et al. 2014

International Materials Reviews

View full text Add to dashboard Cite

When polycrystalline metals and their alloys are used at high temperature, creep deformation leads to changes in their internal state. The change in internal state manifests itself in many ways, but the two ways that concern us in this review are (i) the creation of internal stress arising from the strain incompatibility between grains and/or the formation of cell/sub-grain structures and (ii) a change in the material resistance. This review aims to provide a clear separation of these two concepts by exploring the origin of each term and how it is associated with the creep deformation mechanism. Experimental techniques used to measure the internal stress and internal resistance over different length-scales are critically reviewed. It is demonstrated that the interpretation of the measured values requires knowledge of the dominant creep deformation mechanism. Finally, the concluding comments provide a summary of the key messages delivered in this review and highlight the challenges that remain to be addressed.

show abstract

“…This approach aids the development of these models, while at the same time providing a physical interpretation of the experimental results. Experimental data to validate self-consistent models within the creep regime are limited [1,4,[6][7][8][9][10]. For example, Ma et al [10] studied internal stress evolution using in situ neutron diffraction when a polycrystalline superalloy was creep deformed at 900°C and a primary stress level of 425 MPa for about 35 h. The selection of such a high test stress and temperature seems to be limited by the availability of neutron beam time.…”

Section: Introductionmentioning

confidence: 97%

Internal strains between grains during creep deformation of an austenitic stainless steel

Chen

Wang

et al. 2015

J Mater Sci

View full text Add to dashboard Cite

Internal strains that develop between grains during creep of an austenitic stainless steel were measured using in situ neutron diffraction. The secondary creep prestrained test specimens were considered. Measurements were undertaken before, during and post creep deformation at 550°C. There was no measurable change of internal strains between grains during in situ creep for 4 h at 550°C. In addition, the effect of increasing/reducing temperatures in a range from 470 to 550°C on the internal strains was measured and interpreted with respect to contributions from thermal expansion/contraction. No further internal misfit strains between grains were created when specimen crept during the dwell time at 530, 510, 490 and 470°C. Results are discussed with respect to (i) the general structure of self-consistent models and (ii) the optimised use of neutron sources for creep studies.

show abstract

Anelasticity in austenitic stainless steel

Cited by 26 publications

References 31 publications

Effect of boundary conditions on the evolution of lattice strains in a polycrystalline austenitic stainless steel

Effect of boundary conditions on the evolution of lattice strains in a polycrystalline austenitic stainless steel

A review of the changes of internal state related to high temperature creep of polycrystalline metals and alloys

Internal strains between grains during creep deformation of an austenitic stainless steel

Contact Info

Product

Resources

About