Abstract
Aproposal was submited before by one of us as to the selection of the temperature to obtain the highest value of endrance on the low temperature hardening of piano wires. In the present reseach it was proposed to make sure of that method, and, based on torsion fatigue tests, the relation between duration and temperature of heating was examind. Although it is the general practice to estimate fatigue limits from tension and hardness, it has been found that in case of materials like piano wires, which were cold worked at first by a special mechanical process and thereafter heat treated, the maximum values of tension and hardness did not necessarily accompany the highest limits of fatigue. According to the practice here proposed, indeed, the maximum fatigue limit is about 10% higher than in time of the maximum value of tension and hardness.
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