Analysis of the extent of interphase precipitation in V-HSLA steels through in-situ characterization of the γ/α transformation

In-situ characterization techniques have been applied to elucidate the influence of γ/α transformation upon the extent of interphase precipitation in a low-carbon, vanadium-HSLA steel. Electron Back-scattered diffraction analyses of the γ/α orientation relationship with continuous cooling at 2 and 10 K/s suggest that the proportion of ferrite likely to hold interphase precipitation varies little with cooling rate. However, TEM analyses show that the interphase precipitation refines with increasing cooling rate in this cooling range. With cooling rates in excess of 20 K/s, interphase precipitation is increasingly suppressed due to the increasingly diffusional-displacive nature of the Widmanstätten γ/α transformation that is activated. The present study illustrates that the extent and dimensions of interphase precipitation can be controlled through controlled cooling.

Publisher Statement: NOTICE: this is theauthor’s version of a work that was accepted for publication in MaterialsCharacterization. Changes resulting from the publishing process, such aspeer review, editing, corrections, structural formatting, and other quality controlmechanisms may not be reflected in this document. Changes may have been made tothis work since it was submitted for publication. A definitive version wassubsequently published in Materials Characterization, [115, (2016)] DOI:10.1016/j.matchar.2016.03.021

 

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