低温焼入れした低炭素鋼の高温度疲労強度に及ぼす時効の影響
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概要
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In the fatigue test at elevated temperatures, the test pieces must be pre-heated to the prescribed testing temperature. In LTQ low carbon steel, therefore, the age-hardening takes place during such pre-heating. In the present study, the rotary bending fatigue test was performed at elevated temperatures ranging from room temperature to 500℃ and under the running speed of 3500 rpm, after pre-heating the specimens for 1 hr, The main results were as follows. (1) In the pre-heating at temperatures from room temperature to 150℃, the surface hardness increased with heating time. The hardness reached maximum at 150℃ after l hr. At 300℃ and 400℃, the over-age hardening phenomenon was seen after 1 hr. This is considered due to carbide dispersions. (2) The hardness values at 1 hr heating were Hv 135, Hv 150, Hv165, Hv 125 and Hv 120 at room temperature, 100℃, 150℃, 300℃ and 400℃, respectively. In the subsequent fatigue test at 150℃, the hardness decreased with increasing the number of stress cycles. On the other hand, in the tests at 100℃ and 300℃, the hardness increased with increasing the number of stress cycles. (3) The fatigue strength at 10^7 cycles σ_w were 23 kg/mm^2, 26 kg/mm^2, 23 kg/mm^2, 30 kg/mm^2 and 25 kg/mm^2 at room temperature, 100℃, 150℃, 300℃ and 400℃, respectively. These fatigue strengths seem to be unrelated with the hardness values at the start of fatigue tests after I hr pre-heating. (4) A11 of the values of σ_w for LTQ steel were higher than those for annealed steel. It seems that this fact in LTQ steel is due to the combined contribution of age-hardening in pre-heating and cyclic stressing. On the other hand, in annealed steel, the effect of age-hardening is less than that in LTQ steel. (5) In the LTQ steel as well as in the annealed steel, in the temperature range up to 500℃ the fatigue strength became maximum at 100℃ and 300℃, and the value at 300℃ was higher than that at 100℃.
- 社団法人日本材料学会の論文
- 1975-05-15
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