Wear resistance properties of austempered ductile iron |
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Authors: | Y S Lerner G R Kingsbury |
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Affiliation: | (1) University of Northern Iowa, 50614-0178 Cedar Falls, IA, USA;(2) 44124 Lyndhurst, OH, USA |
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Abstract: | A detailed review of wear resistance properties of austempered ductile iron (ADI) was undertaken to examine the potential
applications of this material for wear parts, as an alternative to steels, alloyed and white irons, bronzes, and other competitive
materials. Two modes of wear were studied: adhesive (frictional) dry sliding and abrasive wear. In the rotating dry sliding
tests, wear behavior of the base material (a stationary block) was considered in relationship to countersurface (steel shaft)
wear. In this wear mode, the wear rate of ADI was only one-fourth that of pearlitic ductile iron (DI) grade 100-70-03; the
wear rates of aluminum bronze and leaded-tin bronze, respectively, were 3.7 and 3.3 times greater than that of ADI. Only quenched
DI with a fully martensitic matrix slightly outperformed ADI. No significant difference was observed in the wear of steel
shafts running against ADI and quenched DI. The excellent wear performance of ADI and its countersurface, combined with their
relatively low friction coefficient, indicate potential for dry sliding wear applications. In the abrasive wear mode, the
wear rate of ADI was comparable to that of alloyed hardened AISI 4340 steel, and approximately one-half that of hardened medium-carbon
AISI 1050 steel and of white and alloyed cast irons. The excellent wear resistance of ADI may be attributed to the strain-affected
transformation of high-carbon austenite to martensite that takes place in the surface layer during the wear tests. |
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Keywords: | abrasion wear test abrasive medium austempered ductile iron austenite coefficient of friction countersurface material martensite rotating dry sliding test stress-affected phase transformation wear behavior |
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