Synchrotron analysis of toughness anomalies in nanostructured bainite

L. C D Fielding; N. G. Jones; J. Walsh; S. Van Boxel; M. S. Blackmur; P. D. Lee; P. J. Withers; H. J. Stone; H. K D H Bhadeshia

doi:10.1016/j.actamat.2015.11.029

Synchrotron analysis of toughness anomalies in nanostructured bainite

L. C D Fielding, N. G. Jones, J. Walsh, S. Van Boxel, M. S. Blackmur, P. D. Lee, P. J. Withers, H. J. Stone^*, H. K D H Bhadeshia

^*Corresponding author for this work

University of Cambridge

Research output: Contribution to journal › Article › peer-review

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.

Original language	English
Pages (from-to)	52-58
Number of pages	7
Journal	Acta Materialia
Volume	105
DOIs	https://doi.org/10.1016/j.actamat.2015.11.029
Publication status	Published - 15 Feb 2016

Keywords

Bainitic steel
Charpy impact test
Synchrotron diffraction
Toughness

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10.1016/j.actamat.2015.11.029Licence: CC BY

Cite this

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title = "Synchrotron analysis of toughness anomalies in nanostructured bainite",

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.",

keywords = "Bainitic steel, Charpy impact test, Synchrotron diffraction, Toughness",

author = "Fielding, \{L. C D\} and Jones, \{N. G.\} and J. Walsh and \{Van Boxel\}, S. and Blackmur, \{M. S.\} and Lee, \{P. D.\} and Withers, \{P. J.\} and Stone, \{H. J.\} and Bhadeshia, \{H. K D H\}",

year = "2016",

month = feb,

day = "15",

doi = "10.1016/j.actamat.2015.11.029",

language = "English",

volume = "105",

pages = "52--58",

journal = "Acta Materialia",

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TY - JOUR

T1 - Synchrotron analysis of toughness anomalies in nanostructured bainite

AU - Fielding, L. C D

AU - Jones, N. G.

AU - Walsh, J.

AU - Van Boxel, S.

AU - Blackmur, M. S.

AU - Lee, P. D.

AU - Withers, P. J.

AU - Stone, H. J.

AU - Bhadeshia, H. K D H

PY - 2016/2/15

Y1 - 2016/2/15

N2 - 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.

AB - 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.

KW - Bainitic steel

KW - Charpy impact test

KW - Synchrotron diffraction

KW - Toughness

UR - https://www.scopus.com/pages/publications/84951335589

U2 - 10.1016/j.actamat.2015.11.029

DO - 10.1016/j.actamat.2015.11.029

M3 - Article

AN - SCOPUS:84951335589

SN - 1359-6454

VL - 105

SP - 52

EP - 58

JO - Acta Materialia

JF - Acta Materialia

ER -

Synchrotron analysis of toughness anomalies in nanostructured bainite

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Structural Evolution across multiple time and length scales

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Synchrotron analysis of toughness anomalies in nanostructured bainite

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Keywords

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Structural Evolution across multiple time and length scales

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