Some new techniques of the spheroidizing high strength solution treatment, boiling water quenching and high temperature tempering of the carbides in the electroslag casting of GCr15 steels are mainly studied.

The process parameters of medium frequency induction hardening for minicar half shafts were introduced.

The paper discusses the real-time detection and the control of technological parameters for mid-frequency quencher by using a monolithic microcomputer MCS-80 3 1and presents the elementary principles of computer control.

This paper introduces the application of the fuzzy control technique in mid-frequency quencher control system, also introduces the process using discrete range, grade of membership and control rules to calculate control table offline, and the principle figure of single chip Microcomputer Mid-Frequency Quencher Fuzzy Control System.

Traditional medium frequency hardening process can only achieve case hardening, improve surface hardness but no hardened layer on tooth groove.