EFFECT OF FATIGUE ACCUMULATION ON DELAYED FRACTURE CRACK INITIATION IN HIGH STRENGTH STEEL.

被引：0
|
作者：
Kido, Mitsuo
Nakasa, Keijiro
Takei, Hideo
机构：
来源：
Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals | 1975年 / 39卷 / 07期
关键词：
STEEL HEAT TREATMENT - Tempering;
D O I：
10.2320/jinstmet1952.39.7_735
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学科分类号：
摘要：
The influence of fatigue accumulation given by pulsating tensile stress (bending) on the delayed fracture crack initiation was studied with notched specimens of Ni-Cr-Mo steel (SNCM 8) quenched and tempered at 200 or 400 degree C. When tempering temperature is 200 degree C, the time to crack initiation in delayed fracture decreases as the fatigue accumulation stress and the amount of the fatigue accumulation are increased, but the critical stress below which no crack initiation occurs is not changed by the fatigue accumulation. When tempering temperature is 400 degree C, both the time to crack initiation and the critical stress are decreased by the fatigue accumulation.
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页码：735 / 741
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