EROSION RESISTANCE OF PERMANENT MOLDED HIGH CHROMIUM IRON

Permanent moulded high chromium irons were prepared in the laboratory and erosion resistance of these castings were assessed using jet erosi on test. The composition and heat treatment in permanent moulded casti ng is varied so as to obtain different carbide volume fraction and aus tenite levels in the microstructure. The erosion trends in high chromi um irons are brought out with respect to angle of impact and velocity of impact. The permanent mould castings features fine carbides in a ma trix of austenite and martensite. The finer carbides were found to imp art considerable amount of erosion resistance. Higher carbon in these castings, promoted superior erosion resistance. However, these casting s were seen to be prone to cracking during handling.