The results show that the boronizing-marquenching process provides the desirable result and the durability of the dies increases by 2 times than that of ones treated by tranditional process.

The results show that with the rising of austempering temperature, their strength and hardness decrease, while elongation and toughness increase in the austenite-bainite ductile iron by single austempering.

Effects of Si and Austempering on the Wearresistance Property of ZG30SiMnCr;

Effect of Austempering on Mechanical Properties and Abrasion-Resistance of Mn -Cr Alloyed White Cast Iron;

Research of austempering process of low-carbon ductile iron;

Strengthening and Toughening of Die Steel Cr7Mo3V2Si by Isothermal Hardening with Prenitriding and Diffusion;

The influences of various isothermal hardening treatments on microstructure and properties of semi-steel made by quenching and isothermal hardening and forging,which contain 1.

2)=900～1000 MPa,σ_b=1300～1564 MPa)and excellence plasticity(δ_5=15%～18%)were obtained after aus- tenitization at 840～880℃followed by isothermal hardening for 3 hours.

The influence of austempering treatment on the microstructure, retained austenite and fracture toughness of high silicon cast steel has been studied.

The results show that a pure ausferrite structure that consists of bainitic ferrite and carbon riched retained austenite can be obtained by austempering treatment of high silicon cast steel over a large temperature range (240～400℃).

The results show that the better match of strength and toughness of 20Mn2SiVB steel can be obtained by isothermal quenching at 420℃.

Isothermal quenching treatment is one of effective methods to improve properties of austenitic-bainitic steel.

The isothermal quenching process of the ductile iron camshaft was analyzed.