The dual-modification effect of K/Na-Si and K/Na-Mo on as-cast high-speed steel(HSS)used for rolls is researched and the effects on the structures and properties of as-cast HSS are also analyzed.

Study on complex modification of Al-Mg-Si alloys;

By means of analysis of microstructure and measuring of impact toughness and hardness,and verification by real manufacture and application,the Si-Mn steel with rare earth and boron complex modification is better than traditional high Mn steel to produce tractor track guard in the wide range of temperature and the low cost and long life.

The results show that the complex modification of P and RE can obviously improve wear resistance of hypereutectic Al-20%Si alloy.

Effects of compound modification on microstructure of hypereutectic high chromium cast iron;

Influence of compound modification on the mechanical properties of high silicon alumimum alloy;

The effect of addition of Ce and compound modification on microstructure and properties of as-cast Al-21Si-1.

Effects of RE multiple modification on the structure of super-high manganese steel;

By means of the modification of RE-Al-Ti-C compound,the eutectic structure of the steel is refined and the amount of divorced eutectic increases.

Effects of Composite Modification on the Mechanical Properties of ZL101 Alloy;

The Al-Si-Mg alloy was cooled and solidified under the different condition of air, water and liquid nitrogen after composite modification by the addition of the refiner (Al-1Ti-1B or Al-3Ti-3B master alloy) and the modification agent (Al-9Sr master alloy).

The influences of composite modification order with phosphor and rare earth on the microstructure of hypereutectic A1-24%Si alloy were investigated,the composite modification mechanism was discussed.