Effects of Setting-Treatment at Elevated Temperature on the Fatigue Strength and Fatigue Deformation of Coiled Spring

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This paper presents the results of compressive fatigue and creep tests on piano wire coiled spring, setting-treated at elevated temperature conditions. The specimen is treated for 4min at a temperature of 250°C under the compressive load of 40kg, for this condition gives the material the highest values of proportional limit and spring constant.The results obtained are as follows;(1) The fatigue limit of setting-treated spring is about 14% higher than the conventional bluing-treated one.(2) The value of deformation limit is nearly constant for the value of τa/τm from 0.6 to 1.0, while it becomes higher as the value of τa/τm becomes lower.
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