METHOD FOR SHOT PEENING
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United States of America Patent
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Issued Date -
Jun 27, 2013
app pub date -
Aug 4, 2011
filing date -
Aug 5, 2010
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
The present invention is to provide a method for shot peening for producing a compressive residual stress that exceeds 60% of the yield strength at 0.2% offset without using stress shot peening. Shot media are peened onto a processed steel that has an amount of retained austenite in a range between 5 to 30%, and any change in the amount of retained austenite is controlled to be in a range of 2 to 30% before and after shot peening to produce the compressive residual stress in the processed steel.
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