Effect of Heat Treatment Temperature on Microstructure and Properties of Super-high Strength Steel
The effects of austenitizing temperature and isothermal temperature on microstructure and properties of super-high strength steel were studied. The results show that the strength of the steel increase with the increase of austenitizing temperature, while the ductility and toughness decline. And the tensile strength of the steel gently decline with the increase of isothermal temperature. The optimum heat treatment process are austenitizing at 880 ℃ for 25 min and isothermality keep for 1.5 min, oil cooling, and the tensile strength is greater than 2 060 MPa and reduction of area is more than 25.6%.