Experimental Study on Hot Bending of 22MnB5 Steel

Abstract

Special V-shaped heat bending test was designed for 22MnB5 hot forming steel of different thicknesses. Blanks after heating 5 min at around 950°C to austenize fully were bended at different temperature conditions, and simultaneously the spring-back behavior and microstructure features of heat bending specimens were investigated. The result shows that 600-650°C temperature zone is optimal for bending forming and martensite texture transforming. Real hot forming anti-collision beams were produced at 600-650°C and comparison bending test was conducted to reveal more qualified mechanics at this temperature zone.

Study on Austenitizing Process in Hot Stamping of 2000 MPa Grade Ultra-High Strength Steel

“…Not only the starting temperature of martensite, but also the amount of martensite decreased by applying higher strain and higher force level. Guo et al [2] studied some basic properties and applications of hot stamping steel for vehicles, and obtained basic mechanical properties such as tensile strength, bending strength and stress-strain relationships of 22MnB5, and obtained key process parameters in the hot stamping process. Hou et al [3] studied the effects of heating temperature on the microstructures and austenite grains of 22MnB5, and found that with the increase of heating temperature, the width of martensite lath bundle and austenite grain size of sheet microstructure increase.…”