1993 Volume 79 Issue 12 Pages 1345-1349
Transformation plasticity related to the bainitic transformation during continuous cooling with applied stress up to 190MPa in a low carbon HSLA steel was studied. The effect of superplastic deformation on microstructure and tensile properties was also examined. The obtained results are as follows :
(1) Bs and bainite trasformation range were shifted to a higher temperature with increasing of applied stress above about 60MPa.
(2) Bainitic structure consisted of lath-like bainitic ferrite and granular bainitic ferrite. An increase of applied stress decreased the former and the structure at 190MPa of applied stress was almost granular.
(3) For stresses above about 50MPa superplastic strain was greater than linear function of applied stress.
(4) Superplastic deforming in the bainite transformation did not change the tensile properties in tests at room temperature and -196°C.
