The Effectof Insert of WC Powder on the Surface Hardening of Non Magnetic Foundry Materials

Non magnetic foundry materials such as the austenitic stainless cast steel had not been used for abrasion resistant materials, because their hardnesses were very low. Usually, ceramics, cermets and cemented carbides are used for the abrasion resistant materials even though they are expensive compared with foundry materials. In this study, WC powder were inserted by using the austenitic stainless cast steel (JIS SCS13A) and the austenitic cast iron (JIS FCA-NiCr202) for producing surface hardened non magnetic materials. The melting temperature (pouring temperature) is lower in the austenitic cast iron than in the austenitic stainless cast steel while the fluidity of the melts is superior in the austenitic cast iron. For the WC powder inserted specimens, the hardness, the abrasion resistance and the magnetic property were examined. As a result, it was found that the hardness in the region of inserted WC powder was much higher than that of base metals of the cast steel and the cast iron, and that the magnetic permeability did not change by the inserting. Especially, a lot of WC powder was found to dissolve into the base metal in the cast steel than in the cast iron. In the case of the cast steel, Fe3W3C compound phase having high hardness of HV800 was formed in the region of inserted WC powder. The hardness in the region of inserted WC powder was higher in the cast steel than in the cast iron, because the cast steel contained a lot of chromium compared with the cast iron

The Effectof Insert of WC Powder on the Surface Hardening of Non Magnetic Foundry Materials

Non magnetic foundry materials such as the austenitic stainless cast steel had not been used for abrasion resistant materials, because their hardnesses were very low. Usually, ceramics, cermets and cemented carbides are used for the abrasion resistant materials even though they are expensive compared with foundry materials. In this study, WC powder were inserted by using the austenitic stainless cast steel (JIS SCS13A) and the austenitic cast iron (JIS FCA-NiCr202) for producing surface hardened non magnetic materials. The melting temperature (pouring temperature) is lower in the austenitic cast iron than in the austenitic stainless cast steel while the fluidity of the melts is superior in the austenitic cast iron. For the WC powder inserted specimens, the hardness, the abrasion resistance and the magnetic property were examined. As a result, it was found that the hardness in the region of inserted WC powder was much higher than that of base metals of the cast steel and the cast iron, and that the magnetic permeability did not change by the inserting. Especially, a lot of WC powder was found to dissolve into the base metal in the cast steel than in the cast iron. In the case of the cast steel, Fe3W3C compound phase having high hardness of HV800 was formed in the region of inserted WC powder. The hardness in the region of inserted WC powder was higher in the cast steel than in the cast iron, because the cast steel contained a lot of chromium compared with the cast iron

Slerry -Erosion Behavior of Alminum-Silicon Carbide Composite Alloys

Composite materials have good mechanical properties such as high strength, high hardness and high wear resistance. They are widely used in the fields of automobiles, civil engineering and many other machine industries. Hopefully it will be used more wide engineering fields such as ship industry and slurry sucking up pumps, in which high resistance for slurry-erosion should be required. And also mechanical properties of the materials are known to depend on the microstructure. In this paper, relationships among microstructure, mechanical properties and slurry-erosion behavior are discussed on the specimens of pure Al, dispersion hardend Al alloys ( Al-Si alloys ), solution hardend alloys ( Al-Mg alloy, Al-Cu alloy ) and SiC particles inserted Al alloys for developing a material for slurry sucking up pump. Based on the experimental results, it was revealed that slurry-erosion resistance of the SiC particles inserted Al alloy shows about seven times higher than that of the dispersion hardend alloys and the solution hardend alloys. It was concluded that the SiC particles inserted Al alloys are a promising materials for the slurry sucking up pump