Title: EFFECT OF AUSTENITE DEFORMATION ON CONTINUOUS COOLING TRANSFORMATION FOR A LOW CARBON Mn-B-Nb-Ti STEEL
Abstract: The continuous cooling transformation (CCT) diagrams of austenite non-deformation and 50% compressively deformed at 850 ℃ were constructed by means of a combined method of dilatometryand Vickers hardness measurement for a low carbon Mn-B-Nb-Ti steel. OM and TEM were employed to investigate the induence of cooling rate and deformation process on the transformation behavior and microstructure. The hardenability of austenite is enhanced by the addition of boron. The microstructure changes from Bc2 type bainite(upper bainite) to Bp3 type bainite in non-deformed austenite with decreasing the cooling rate. Plastic deformation on austenite induced niobium borocarbonittide precipitation and promoted both bainite transformation at higher temperature than that in undeformed austenite inducing Bm3/a type bainite formation and stifled the growth of bainitic ferrite by tangled dislocations resulting the refinement of microstructure.
Publication Year: 1999
Publication Date: 1999-01-01
Language: en
Type: article
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