The Mechanism of Acicular Ferrite Formation in Steel Weld Deposits

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


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

Bainitic Welds TRIP-Assisted Steels?
Strong Bainite Cold Bainite
Hard Bainite Intragranular Bainite
Fast Bainite Upheavals

Movies about Martensite and Bainite

PT Group Home Materials Algorithms Any Valid CSS!