Abstract
The authors examined the relation between the damping capacity and fatigue strength of time piece spring.The results obtained are as follows:(1) The damping capacity of those springs which are oil quenched and tempered is the lowest at the tempering temperature 300-400°C. At this tempering temperature the structure of the spring is most stable and strongest for repeated stress. This low damping capacity and high fatigue strength are due to the fine tempering structure.(2) When the spring is tempered at constant temperature, the damping capacity rapidly decreases and then slowly increases as the tempering time. This co-ordinates the relaxation of internal stress and the decomposition of residual austenite.(3) About the Austempering, the experimental results were so irregular that no conclusion was secured.
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