Patent ID: 8940111
Filing Date: 2015-01-27
Classification: C21D

Abstract:
1. A method of achieving TRIP microstructure in steels by means of deformation heat comprising the steps of: heating steel feedstock to a temperature below the temperature at which transformation to austenite begins, the feedstock having a ferrite-pearlite microstructure; thereafter, forming the feedstock into a final product using severe plastic deformation, where the plastic deformation applies deformation energy to the feedstock which increases the feedstock's temperature to the final temperature between the temperature at which transformation to austenite begins and the temperature at which transformation to austenite is completed and whereupon a part of the ferrite-pearlite microstructure of the feedstock transforms into austenite; cooling the final product from the final temperature to a temperature within the bainite nose and held, which causes TRIP microstructure to form; cooling the final product down from the temperature within the bainite nose to ambient temperature.