Surface Relief Due to Bainite Transformation at 200°C

M. J. Peet and H. K. D. H. Bhadeshia

Metallurgical and Materials Transactions A, 42 (2011) 3344-3348.

DOI: 10.1007/s11661-011-0755-3


Extremely thin plates of bainitic ferrite can now routinely be induced in steels by heat-treatment at low homologous temperatures. Given the atomic mechanism by which the transformation occurs, morphology should be dominated by the minimisation of strain energy due to the displacements necessary to accomplish the change in crystal structure when austenite decomposes into bainite. Experiments have been conducted using atomic force microscopy in an attempt to characterise these displacements, with a surprising outcome that the shear strain is much larger than associated with conventional, coarser bainitic structures. It appears that this might explain why the plates of bainitic ferrite tend to be slender in this new class of nanostructured alloys.

Surface Relied Due to Bainite transformed at 200 Celcius