Continuous Cooling Transformation Behavior of High Strength Low-Alloyed Cold Rolled Sheet Steel
The dilatometry curves and the critical phase transformation temperatures of high strength low-alloyed (HSLA) cold rolled sheet steel were determined by thermal simulation test machine. The samples were austenitized at 900°C,deformed at 40% of deformation and cooled at different rates of 0.1°C/s~ 60°C/s. The continuous cooling transformation (CCT) diagram under deformation condition can be drawn. The results showed that the critical phase transformation temperatures are as follows: Ac3=900°C, Ac1=735°C, Ar3=825°C, Ar1=695°C. A few amount of martensite in high strength low-alloyed cold rolled steel can be obtained at the cooling rate of 60°C/s. The experimental data provide the technical references for rolling control, cooling control and heat treatment in real production.
Young Won Chang, Nack J. Kim and Chong Soo Lee
H. Liu et al., "Continuous Cooling Transformation Behavior of High Strength Low-Alloyed Cold Rolled Sheet Steel ", Advanced Materials Research, Vols. 26-28, pp. 27-31, 2007