Method for improving fatigue strength of cast iron material
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United States of America Patent
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Aug 11, 2015
Grant Date -
Sep 26, 2013
app pub date -
Oct 31, 2011
filing date -
Dec 2, 2010
priority date (Note) -
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Abstract
The purpose of the present invention is to provide a method for improving fatigue strength that is capable of improving the fatigue strength of cast iron, specifically spherical graphite cast iron, to the same level as that of carbon steel subjected 10 carburizing and quenching. To this end, this method contains a step for performing first, second and third shot peenings using shot of a prescribed diameter for each on spherical graphite cast iron on which a tempering heat treatment has been performed at 150-300° C. and tensile strength made to be 800 MPa or more, the spherical graphite cast iron containing the following elements in the following mass percentages: C=2.0-4.0%, Si=1.5-4.5%, Mn=2.0% or less, P=0.08% or less, 8=0.03% or less, Mg=0.02-0.1%, and Cu=1.8-4.0%.
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