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The ideal hardness of the workpiece can be obtained after induction quenching and heat treatment. The following six methods can be interpreted:
1. Steel bar quenching and heat treatment equipment, steel tube quenching production line, etc. The hardness of threading steel after being quenched by heat treatment equipment and other metals can be higher than that of ordinary quenching, which is mainly related to the compressive stress state of the surface layer of the workpiece after induction quenching.
2. When the original structure of the steel is the mixed structure of P / F, the hardness of the steel decreases after medium frequency induction quenching. This is closely related to the short-time rapid heating of induction quenching, which leads to the insufficient dissolution of C-compounds and the inhomogeneous diffusion of all kinds of elements.
3, the heating speed of induction heat treatment and quenching equipment of steel bar is very fast, which can enlarge the range of A-body transition temperature and shorten the transition time. After quenching, the surface layer of the workpiece has very fine martensite, and the hardness is slightly higher (2~3HRC).
4. The grain after medium frequency induction quenching is very fine, the heat is concentrated on the surface, the heat-affected zone is small, and the hardness is higher than that of ordinary quenching.
5, steel rod, steel pipe, steel bar, thread steel after quenching and heat treatment of the work piece tempering ability is poor, although its hardness than the ordinary quenching hardness 2? 3HRC, but a slight tempering (tempering temperature is not high), the hardness will be reduced. The reason should be that unstable austenite is transformed into unstable martensite with poor tempering resistance.
6. The austenite produced by mid-frequency induction quenching and heat treatment does not go through the growth and even stage, so it is unstable. At the same time, there are many micro-defects stored in martensite crystals when they are transformed into martensite, so it is necessary to transition spontaneously to stable state.
Overseas manager: Tom Wang
Email:tom@foreverfurnace.com
Phone: 0086-13303078975(whatsapp, wechat,line)
Specialist of bar heat treatment furnace in China; Glad to be your business partner in induction heating field.
Post time: 04-17-2019