| 摘要 |
PURPOSE:To improve the fatigue strength of an alloy steel contg. a prescribed percentage of C by austempering and shot-peening the steel under prescribed conditions so as to make the mechanically processed layer thick as well as to shorten the time required to heat treat the material. CONSTITUTION:An alloy steel contg. 0.5-1% C is austempered to increase the hardness HRC to 50-60. The steel is subjected to warm shot peening at the austempering temp., and it is cooled once to room temp. The steel is then subjected to secondary shot peening with shot having a smaller diameter than shot used in the primary shot peening.
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