Explanation

Effectively and comprehensively utilize deformation strengthening and phase transformation strengthening to combine hot working (forging, rolling, etc.) and heat treatment operations to unify the forming process and heat treatment process to obtain final properties. This method can not only obtain a good combination of high strength and high plasticity (toughness) that can not be achieved by general treatment, but also greatly simplify the production process of metallic materials or workpieces and improve the quality of materials or workpieces. The process can be applied in a wide range, including almost all kinds of metallic materials such as carbon steel, alloy structural steel, tool steel, stainless heat resistant steel, nickel or molybdenum based alloy, aluminum alloy and titanium alloy. There are many process methods. According to the arrangement order of deformation and phase transformation in the process, it can be divided into three categories: deformation before phase transformation, phase transformation, and phase transformation. In addition, there is a so-called derived thermomechanical treatment process method derived from the above basic methods. Before phase transformation, deformation includes: high temperature deformation quenching (including forging heat quenching and rolling heat quenching), high temperature deformation normalizing, high temperature deformation isothermal quenching, sub temperature deformation quenching, low temperature deformation quenching, low temperature deformation isothermal quenching, etc. deformation in phase transformation includes: deformation induced ferrite phase transformation, deformation induced pearlite phase transformation, deformation induced precipitation, isothermal deformation quenching, continuous cooling deformation treatment, etc. After phase transformation, deformation includes pearlite body temperature deformation, pearlite cold deformation, martensite (tempering martensite, bainite) deformation aging, etc. Derived from: pre thermomechanical treatment, surface deformation aging, surface high temperature deformation quenching, composition thermomechanical treatment, deformation chemical heat treatment (forging heat carburizing quenching, forging heat quenching nitriding, low temperature deformation quenching sulphurizing), chemical thermomechanical treatment (carburizing surface deformation aging, carburizing surface deformation quenching), etc.

Classification