A study of low-strain and medium-strain grain boundary engineering

Randlè, Valerie; Coleman, Mark

doi:10.1016/j.actamat.2009.04.002

Cited by 88 publications

(39 citation statements)

References 14 publications

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“…Fluctuations in the R3 fraction during iterative processing have also been reported in earlier studies [14,33,39,40] and this is often explained in terms of accumulation of strain in R3 boundaries during initial iterations. During the early iterations (first and second), strain is accumulated due to dislocation pile-up at twin boundaries and this increases the internal stress.…”

Section: Iterative Processingmentioning

confidence: 83%

Grain boundary engineering in alloy D9 through thermo-mechanical processing: influence of process variables and aspects of micro-mechanisms

Mandal

Bhaduri

Sarma

2010

Int J Adv Eng Sci Appl Math

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By employing low-strain one-step thermomechanical processing (OTMP) and iterative thermomechanical processing (ITMP) we developed grain boundary engineered microstructure in a Ti-modified austenitic stainless steel (alloy D9). In OTMP, small amount of strain (0, 5, 10 and 15%) was imparted on solution annealed sample and subsequently annealed at various temperatures (1173-1273 K) for different time periods (0.5, 1 and 2 h). A pre-strain of 10-15% followed by annealing at 1273 K for 0.5-2 h has been found to be the suitable OTMP to increase the fraction of R3 n boundaries significantly. ITMP employing 10% thickness reduction followed by annealing at 1273 K for 0.5 h revealed fluctuations in the evolution of R3s. ITMP employing 2.5% thickness reduction per iteration, on the other hand, resulted in continuous increase in R3 boundary fraction and a moderate increase in R9 and R27 boundaries. The role of R3 boundaries on the mechanical properties of GBE processed specimen was studied by correlating the hardness with grain size evaluated with and without considering twin boundaries. The paper also discusses the micro-mechanisms involved during low-strain GBE processes in austenitic stainless steel.

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Section: Iterative Processingmentioning

confidence: 83%

Grain boundary engineering in alloy D9 through thermo-mechanical processing: influence of process variables and aspects of micro-mechanisms

Mandal

Bhaduri

Sarma

2010

Int J Adv Eng Sci Appl Math

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“…This is likely caused by the strain concentration adjacent to the R3 boundary. The effectiveness of R3 boundaries as barriers to plastic flow has been identified [26], which results in deformation accumulation at the boundary during the process of Fig. 6.…”

Section: Resultsmentioning

confidence: 99%

Residual strain measurement and grain boundary characterization in the heat-affected zone of a weld joint between Alloy 690TT and Alloy 52

Hou

Shoji

et al. 2010

Journal of Nuclear Materials

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“…The results of Randle et al 37 revealed that the TBs, especially the coherent TBs, are more effective barriers against plastic flow compared to the GBs in a copper of 99.99% purity because of their lower energy and higher mechanical stability. Also, recent studies show that nanoscale coherent TBs can substantially strengthen the ultrafine-grained metals while preserving acceptable levels of ductility 38,39 .…”

Section: Discussionmentioning

confidence: 96%

Large recovery strain in Fe-Mn-Si-based shape memory steels obtained by engineering annealing twin boundaries

et al. 2014

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Shape memory alloys are a unique class of materials that can recover their original shape upon heating after a large deformation. Ti-Ni alloys with a large recovery strain are expensive, while low-cost conventional processed Fe-Mn-Si-based steels suffer from a low recovery strain (o3%). Here we show that the low recovery strain results from interactions between stress-induced martensite and a high density of annealing twin boundaries. Reducing the density of twin boundaries is thus a critical factor for obtaining a large recovery strain in these steels. By significantly suppressing the formation of twin boundaries, we attain a tensile recovery strain of 7.6% in an annealed cast polycrystalline Fe-20.2Mn-5.6Si-8.9Cr-5.0Ni steel (weight%). Further attractiveness of this material lies in its low-cost alloying components and simple synthesis-processing cycle consisting only of casting plus annealing. This enables these steels to be used at a large scale as structural materials with advanced functional properties.

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A study of low-strain and medium-strain grain boundary engineering

Cited by 88 publications

References 14 publications

Grain boundary engineering in alloy D9 through thermo-mechanical processing: influence of process variables and aspects of micro-mechanisms

Grain boundary engineering in alloy D9 through thermo-mechanical processing: influence of process variables and aspects of micro-mechanisms

Residual strain measurement and grain boundary characterization in the heat-affected zone of a weld joint between Alloy 690TT and Alloy 52

Large recovery strain in Fe-Mn-Si-based shape memory steels obtained by engineering annealing twin boundaries

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