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| Effect of Heat Treatment on Microstructure of Modified Cast AISI D3 Cold Work Tool Steel |
| Shahram Kheirandish |
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Abstract High chromium high carbon AISI D3 steel is used as cold-work tools and dies in industry. Microstructure of this wrought steel usually consists of chromium carbides homogenously dispersed in a ferritic or martensitic matrix. On the other hand, a eutectic network consisting of chromium carbide and austenite forms in a cast D3 steel, at the end of solidification due to the segregation of carbon and chromium. This heterogeneous microstructure gives rise to the reduced mechanical properties such as toughness, impact strength, and tensile strength. In this research, modified AISI D3 steel was developed by replacing part of Cr with Nb and Ti, in which chromium carbide was partially replaced with MC carbides. The cast samples produced by investment casting were heat treated at different conditions. The microstructures of the samples were studied by light and scanning electron microscope attached with EDS analyzer. To determine the optimized homogenizing process, the effects of homogenizing treatment on the microstructure and the morphology of carbides were also studied.
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Received: 27 April 2009
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2010, Vol. 17 
