Graduate Thesis Or Dissertation

The development of Fe-Cr-C based alloys for high wear and high impact applications

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  • The structure, hardness, and impact strength of high chromium cast irons was investigated. From the Fe- Cr- C phase diagram, a composition with 74.8 wt% Fe, 21.5 wt% Cr, and 3.7 wt% was selected along the austenite-M₇C₃ eutectic trough. This composition was bracketed by others with slightly different amounts of iron, chromium, and carbon. These basic alloys were then modified with additions of manganese, nickel, titanium, and silicon. Hardness measurements were made on small arc melted buttons and on cast impact specimens. The hardness of these alloys varied from Rc 45 (BHN 425) to Rc 65 (BHN 750). The impact specimens were round pins for a modified Izod test. Most alloys had impact strengths from 2 to 3 ft-lb. However, a slightly hypoeutectic alloy had an impact strength of 7 ft-lb at room temperature and 5 ft-lb at -40°F (-40°C). This was obtained with an alloy of 74 wt% Fe, 18.8 wt% Cr, 3. 7 wt% C, 2 wt% Mn, 2 wt% Ni, and 0.5 wt% Si. Based on these limited tests, it was concluded that it should be possible to develop a moderately tough Fe-Cr-C based cast iron. Alloys with this toughness, combined with the high hardness, should find applications in the mining and ore handling industry.
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