炭素鋼の回転曲げ疲労強度に及ぼす真空焼なましの影響

概要

論文の詳細を見る
Up to the present, little is known on the effect of the surface layer hardened by machining on the fatigue strength of steel and the condition to remove such surface layer by low temperature annealing in vacuum. In the present study, the effect of annealing in vacuum on the rotating bending fatigue strength of three kinds of carbon steels (S15C, S35C and S55C) was investigated in order to clarify the above mentioned matters. The results obtained are as follows : (1) The surface layer hardened by machining seems to increase the fatigue strength at relatively large N, and decrease the fatigue strength at relatively small N. This tendency is remarkable in the case of S15C and S35C. (2) In order to remove the surface layer hardened by machining completely without any decrease in its fatigue strength (probably due to growth of grains) by low temperature annealing in vacuum, the annealing at a temperature a little higher than 650℃, 650℃ and a temperature considerably lower than 650℃ for 1 hour are suitable for S15C, S35C and S55C, respectively.
社団法人日本材料学会の論文
1977-07-15