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Grain boundary plane distributions and single-step versus multiple-step grain boundary engineering

Valerie Randle, Richard Jones

Materials Science and Engineering: A, Volume: 524, Issue: 1-2, Pages: 134 - 142

Swansea University Author: Valerie Randle

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Abstract

The ‘five-parameter’ (i.e. both misorientation and grain boundary plane) distribution in type 304 austenitic stainless steel has been measured and evaluated for an ‘as-received’ (AR) specimen and specimens undergoing both single-step grain boundary engineering processing (SSGBE) and multiple-step gr...

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Published in: Materials Science and Engineering: A
ISSN: 0921-5093
Published: 2009
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URI: https://cronfa.swan.ac.uk/Record/cronfa5524
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Abstract: The ‘five-parameter’ (i.e. both misorientation and grain boundary plane) distribution in type 304 austenitic stainless steel has been measured and evaluated for an ‘as-received’ (AR) specimen and specimens undergoing both single-step grain boundary engineering processing (SSGBE) and multiple-step grain boundary engineering processing (MSGBE) comprising three iterations. The results showed that the fundamental requirement for twinning-related GBE is to maximise concomitantly the proportion of both Σ3 and Σ9 boundaries, which in turn supports the development of special planes in the grain boundary network. 〈1 1 0〉 and 〈1 1 1〉 tilt and twist boundaries play a key role in the formation of ‘special’ grain boundary planes. MSGBE added increased proportions of Σ3 boundaries and resulted in development of different characteristics in the planes distribution compared to SSGBE. These modifications are likely to result in improved grain boundary properties after MSGBE compared to SSGBE.
Item Description: This work arose from a £88,493 grant awarded from Rolls Royce Marine for a project ‘Mitigation of intergranular degradation in austenitic stainless steels’. This paper, published in a journal with a five-year IF of 2.22 and having 11 citations, reports a comparison of various grain boundary engineering (GBE) processing routes on austenitic steel 304 and characterization of the resulting microstructure by misorientation and boundary plane analysis. A key finding is that it is important to maximise concomitantly the proportion of both Σ3 and Σ9 boundaries. Interest in this work led to an Invited talk at an international conference, ‘MS&T’.
Keywords: •Thermomechanical processing; •Electron backscattering diffraction (EBSD); •Stainless steels
College: College of Engineering
Issue: 1-2
Start Page: 134
End Page: 142