http://orcid.org/0000-0003-1027-821X
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ABSTRACT
Deformation-induced martensitic transformations are increasingly being used to create desirable mechanical properties in steels. Here, the kinetics of the deformation-induced martensitic transformation is investigated at 300, 263, 223, 173 and 100 K using in situ neutron diffraction during tensile loading. The results from these experiments show a distinct change in the transformation behaviour between 300 K and the tests conducted at 263 K and below, causing a difference in martensite structure. The difference in transformation kinetics is correlated to the suppression of slip at low temperatures, as evidenced using diffraction peak intensity analysis for different grain families and corroborated using transmission electron microscopy. A direct correlation between the deformation-induced martensite fraction and the work-hardening rate is shown.
Acknowledgements
The authors are grateful to the UK Science and Technology Facilities Council for the beam time granted at the ISIS facility (ENGIN-X beamline).
Disclosure statement
No potential conflict of interest was reported by the authors.
ORCID
Yadunandan B. Das http://orcid.org/0000-0003-1027-821X
Alexander N. Forsey http://orcid.org/0000-0001-9017-5194
Michael E. Fitzpatrick http://orcid.org/0000-0002-3618-6594
Thomas H. Simm http://orcid.org/0000-0001-6305-9809
Salih Gungor http://orcid.org/0000-0001-5761-217X
Richard J. Moat http://orcid.org/0000-0002-9445-8658