A surface heat treatment process that quenches only the surface of steel workpieces. The purpose is to improve the surface hardness, wear resistance and fatigue strength, while the heart still has a high toughness. Commonly used in shaft, gear and other parts. The use of rapid heating method to make the workpiece surface austenite, and then immediately quenched the surface tissue into martensite, heart tissue remains unchanged. After the surface quenching generally low temperature tempering. According to different heating methods, can be divided into induction heating surface hardening, flame heating surface hardening, electrical contact surface heating quenching, electrolyte heating surface hardening, the former two methods are the most widely used.
Heating energy is usually electromagnetic induction heating, flame heating, electrical contact heating and heating in the electrolyte; and can use more high-energy, such as electron beam, laser, electric arc. The higher the energy density provided by the energy, the thinner the surface is heated and hardened.
Electromagnetic induction heating surface hardening
Flame heating surface hardening
Electrical contact heating surface hardening
Electrolyte heating surface hardening
