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• Cell count was found to decrease with increasing sulfur.


• Tere is a tendency for type D graphite to form in the cell boundaries with increasing sulfur.


• Te formation of spiky graphite occurred in irons of higher sulfur concentrations in all cast sections and in all three manganese series.


• Intercellular carbides and sulfides were observed in high-sulfur alloys, but only in the 0.28% man- ganese series.


• Tensile testing revealed that the reduction in strength with increasing sulfur was caused by a reduction in the elongation at fracture, without a significant change in the yield point.


Figure 3. This is a high-performance block produced from 351 alloy.


undercooling which, in turn, promotes a good response to heterogeneous nucle- ation of graphite, i.e., a good response to inoculation. Te level of free sulfur is also expected to influence the growth of the graphite flakes, promote branch- ing, and limit the growth of the eutectic cells, all of which positively influence the mechanical properties of cast iron.


THE DISCOVERY Microstructure evaluations and addi-


tional mechanical testing were conduct- ed on the materials from AFS Research Project 12-13 #04. Te test results from this investigation provided more insight on the cause for reduced strength with increasing sulfur contents.


• Te premature fracture in the tensile test was accompanied by a change in fracture mode in the pearlite matrix from ductile tear- ing to transgranular cleavage.


PRESENTATION An Aluminum Casting Alloy for High


Performance Engines AUTHOR David Weiss, Eck Industries


(Manitowoc, Wisconsin) RESEARCH FOCUS Auto manufacturers are under


commercial and regulatory pressure


The annual technical sessions were an important part of the Metalcasting Congress. 48 | MODERN CASTING May 2018


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