The need to revise the current methods to measure and assess static recrystallization behavior

Khoddam, S. and Hodgson, P. D. 2015, The need to revise the current methods to measure and assess static recrystallization behavior, Mechanics of materials, vol. 89, pp. 85-97, doi: 10.1016/j.mechmat.2015.06.008.

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Title The need to revise the current methods to measure and assess static recrystallization behavior
Author(s) Khoddam, S.ORCID iD for Khoddam, S.
Hodgson, P. D.
Journal name Mechanics of materials
Volume number 89
Start page 85
End page 97
Total pages 13
Publisher Elsevier
Place of publication Amsterdam, The Netherlands
Publication date 2015-06-26
ISSN 0167-6636
Keyword(s) Inverse solution
Mechanical characterization
Science & Technology
Materials Science, Multidisciplinary
Materials Science
Summary Heterogeneous deformation developed during "static recrystallization (SRX) tests" poses serious questions about the validity of the conventional methods to measure softening fraction. The challenges to measure SRX and verify a proposed kinetic model of SRX are discussed and a least square technique is utilized to quantify the error in a proposed SRX kinetic model. This technique relies on an existing computational-experimental multi-layer formulation to account for the heterogeneity during the post interruption hot torsion deformation. The kinetics of static recrystallization for a type 304 austenitic stainless steel deformed at 900 °C and strain rate of 0.01s-1 is characterized implementing the formulation. Minimizing the error between the measured and calculated torque-twist data, the parameters of the kinetic model and the flow behavior during the second hit are evaluated and compared with those obtained based on a conventional technique. Typical static recrystallization distributions in the test sample will be presented. It has been found that the major differences between the conventional and the presented technique results are due to the heterogeneous recrystallization in the cylindrical core of the specimen where the material is still partially recrystallized at the onset of the second hit deformation. For the investigated experimental conditions, the core is confined in the first two-thirds of the gauge radius, when the holding time is shorter than 50 s and the maximum pre-strain is about 0.5.
Language eng
DOI 10.1016/j.mechmat.2015.06.008
Field of Research 091307 Numerical Modelling and Mechanical Characterisation
091207 Metals and Alloy Materials
Socio Economic Objective 870399 Construction Materials Performance and Processes not elsewhere classified
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2015, Elsevier
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Document type: Journal Article
Collections: Institute for Frontier Materials
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