The Mechanism of Acicular Ferrite Formation in Steel Weld Deposits

M. Strangwood and H. K. D. H. Bhadeshia

Abstract

Detailed crystallographic measurements, surface relief experiments, microstructural observations and thermodynamic analysis reveal that acicular ferrite grows by a diffusionless mechanism, in which the parent and product lattices are related by an atomic correspondence. Acicular ferrite is found to be very similar to bainite and differs morphologically because it nucleates intragranularly on inclusions within the weld; the morphology is also modified by hard impingement between plates nucleated at adjacent sites.

Advances in Welding Technology and Science,
ASM, Metals Park, Ohio, U. S. A., 1987, pp. 187-191.

Download PDF file

Bainitic Phase Transformations

• Book on bainite
• Mutilingual review on bainite
• Elementary undergraduate lecture on bainite
• Slightly more advanced undergraduate lecture on bainite
• Research publications on bainite
• Bain correspondence and Bain strain

Movies about Martensite and Bainite

• Shape memory effect.
• Shape memory effect.
• Model of displacive transformation.
• Growth of bainite.

PT Group Home

Materials Algorithms