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Recent Progress with Nitrided Valve Springs for Automobile Internal Combustion Engines
ISSN: 0148-7191, e-ISSN: 2688-3627
Published March 03, 2003 by SAE International in United States
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The gas-nitriding characteristics of valve springs made from three different grades of oil-tempered wires were investigated as a preliminary study, and the springs made from the most heat resistant grade of oil-tempered wire (SOTHS) were selected for further study. As a result, fatigue limit strength as high as 736MPa (mean stress) +/- 665MPa (amplitude stress) at a stress repetion of 5×107 cycles was obtained by applying gas-nitriding, followed by multi-stage shot-peening, the last stage of which was very fine steel bead peening with the average size less than 50 μm (SS-Treatment). The reasons for the high fatigue endurance obtained are also discussed.
CitationYamada, Y., Teratoko, K., Kariya, R., and Saitoh, T., "Recent Progress with Nitrided Valve Springs for Automobile Internal Combustion Engines," SAE Technical Paper 2003-01-1312, 2003, https://doi.org/10.4271/2003-01-1312.
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