Synchrotron analysis of toughness anomalies in nanostructured bainite

DOI: 10.1016/j.actamat.2015.11.029

Authors: Lucy Fielding (University of Cambridge) , Nicholas Jones (University of Cambridge) , J. Walsh (University of Manchester) , S. Van Boxel (University of Manchester) , M. Blackmur (University of Manchester) , P. D. Lee (University of Manchester) , P. Withers (University of Manchester) , H. Stone (University of Cambridge) , H. K. D. H. Bhadeshia (University of Cambridge)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Acta Materialia , VOL 105 , PAGES 52 - 58

State: Published (Approved)
Published: February 2016
Diamond Proposal Number(s): 8564

Abstract: High-resolution synchrotron X-ray diffraction has been used to characterise the notch root regions of Charpy impact test specimens of a superbainitic steel, both before and after loading. The changes in the volume fraction of austenite induced by the application of a three-point-bending load were quantified. Analysis of diffraction peak shifts revealed the extent of residual tensile and compressive strains present due to both machining and an applied load. The results lend support to the hypothesis that the comparatively low energies absorbed during Charpy impact testing of superbainitic steels, <7 J, are due to the formation of stress-induced martensite at the notch root, prior to crack initiation.

Journal Keywords: Bainitic steel; Synchrotron diffraction; Charpy impact test; Toughness

Diamond Keywords: Alloys

Subject Areas: Materials, Engineering


Instruments: I15-Extreme Conditions

Added On: 24/03/2016 09:58

Documents:
1-s2.0-S135964541530080X-main.pdf

Discipline Tags:

Materials Engineering & Processes Materials Science Engineering & Technology Metallurgy

Technical Tags:

Diffraction