Three-dimensional analysis of coalesced bainite using focused ion beam tomography

E. Keehan, L. Karlsson, H. K. D. H. Bhadeshia and M. Thuvander

Abstract

The relationship between solute content, microstructure and properties has been clarified for high-strength steel weld metals with 7-9 wt% nickel. Mathematical modelling suggested that at high nickel concentrations, the manganese level must be kept low to achieve good toughness. In combination with other theory and detailed characterisation, it has been possible to achieve both strength and toughness. At the same time, the existence of coalesced bainite is demonstrated.

Materials Characterisation 59 (2008) 877-882.

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Review

• "Coalesced Bainite"
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  H. K. D. H. Bhadeshia, E. Keehan, L. Karlsson and H.-O. Andrén

"Microstructure of lower bainite formed at large undercoolings below bainite start temperature" Materials Science and Technology, 1996, Vol.12, No.3, pp.233-236 L. C. Chang and H. K. D. H. Bhadeshia "Understanding Mechanical Properties of Novel High Strength Steel Weld Metals Through High-Resolution Microstructural Investigations" International Conference: Trends in Welding Research, Alanta, Georgia, ASM International, 2005, in press. E. Keehan, L. Karlsson, H.-O. Andrén and H. K. D. H. Bhadeshia "Strong and Tough Steel Welds" Mathematical Modelling of Weld Phenomena - VI Published by the Institute of Materials, eds H. Cerjak and H. K. D. H. Bhadeshia, 2002, 205-230. M. Murugananth, H. K. D. H. Bhadeshia, E. Keehan, H.-O. Andrén and L. Karlsson "Microstructure and Mechanical Effects of Ni and Mn on Strong-Steel Weld Metals" Trends in Welding Research, eds S. A. David, J. Vitek, T. Debroy, J. Lippold and H. Smartt, ASM International, USA, 2002, 719-723. E. Keehan, H.-O. Andrén, L. Karlsson, M. Murugananth and H. K. D. H. Bhadeshia "Microstructural characterisation of as-deposited and reheated weld metal - High Strength Steel Weld Metals" International Instiute of Welding Document IX-2187-06, E. Keehan, L. Karlsson, M. Thuvander and E.-L. Bergquist

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