Effects of Si Content and Modification on Microstructure and Properties of In-situ Mg_2Si/Mg Composites;

Effect of chromium alloying and complex modification on structures and properties of white cast iron;

Study on Modification of Hypereutectic Al-Fe Alloys;

The results show that the content of austenite is much and the carbide distributed the thick lath form, the grain size is thicker in high chromium casting iron without modification treatment; the amount of residual austenite obviously reduce and the size of austenite greatly fine agter modification treatment, carbide change from thick lath to fin.

The result of the experiment shows that grain organization of bainitic cast steel is apparently refined after compound modification treatment.

With the introduction of the effect of modification elements on the microstucture and proper- ties of cast Zn-Al alloy ZA27,this paper makes an analysis of the modification mechanism,and foresees the prospects of modification treatment of the alloy.

Research of the Inoculation of Tungsten Alloy White Cast Iron Liner and Its Application;

Analysis results of constituents,organization and performance show: material of connector is cast aluminium alloy,its strength is not enough,and without inoculation,brittle needle-alike and net-alike eutectic weaken intercrystalline face,which results in intercystalline fracture.

The results indicate, the segregation of alloy elements is weakened and the pattern of segregation has converted from net form into isolately distributed islands through inoculation.

5 J, andmodifying treatment increases the wear resistance of Mn17, but decreases it slightly under high impactenergy.

The microstructure and abrasion resistance of V-containing high chromium cast irons can be further improved by modifying treatment.

In as-cast microstructures, SG modification can refine austenites and inhibit their orientational arrangement, reduce and refine the intercrystalline carbides; in heat-treatment process, SG modification can either shorten the holding time or lower the holding temperature.