Evaluation and modification of inclusion characteristics in HK40 heatresistant cast steel |
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Authors: | Ali Navaei Reza Eslami-Farsani Majid Abbasi |
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Affiliation: | 1734. Faculty of Mechanical Engineering, K.N. Toosi University of Technology, P.O. Box 1999-19395, Tehran, Iran 2734. Department of Materials Engineering, Babol Noshirvani University of Technology, P.O. Box 484, Babol, Iran
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Abstract: | Specifications of inclusions such as the type, morphology, number, composition, size, and place of inclusions in HK40 heat-resistant casting steel were studied by optical microscopy and scanning electron microscopy equipped with an energy-dispersive spectroscopy system. The effects of calcium silicide (CaSi) addition on these characteristics were evaluated at two pouring temperatures of 1420°C and 1470°C. It was found that most of the appeared inclusions were in the type of chromium oxide. CaSi addition had a significant effect on the morphological modification, size and distribution of inclusions as well as changing the composition to oxide-sulfide compounds. |
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