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首页> 外文期刊>Key Engineering Materials >Increasing Behavior of Strength for Fatigue Fracture of Austenitic Stainless Steel during Fatigue Tests at Elevated Temperature
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Increasing Behavior of Strength for Fatigue Fracture of Austenitic Stainless Steel during Fatigue Tests at Elevated Temperature

机译：高温疲劳试验中奥氏体不锈钢疲劳断裂强度的提高行为

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摘要

In order to clarify notch effect on fatigue strength of an austenitic stainless steel, rotating bending fatigue tests were carried out for smooth and notched specimens at 573K. Clear endurance limits were recognized and the fatigue strength did not decrease continuously with increasing stress concentration factor K_t, notwithstanding any non-propagating crack was not recognized at notch roots for specimens endured at 10~8 stress cycles. According to hardness tests, an area of notch root hardened during fatigue test by dynamic strain aging. The hardening behavior occurred remarkably with increasing K_t. Effects of K_t and the hardening behavior on fatigue strength canceled each other, and then fatigue strength became insensitive to K_t. Fatigue strength σ_(SIT) obtained by stress increment fatigue tests became higher than the ordinary fatigue strength for each specimen of K,, that is, the coaxing effect was recognized clearly. This result indicated that the strength for fatigue fracture increased gradually during fatigue test. σ_(SIT) had a peak value at K_t of 2.0 and it decreased with increasing K_t sensitively. The increasing behavior of strength for fatigue fracture depended on K_t and fatigue fracture was controlled by circumstances of hardened material and stress amplitude considering K_t.
机译：为了弄清楚缺口对奥氏体不锈钢疲劳强度的影响，对光滑和缺口试样在573K进行了旋转弯曲疲劳试验。尽管承受10〜8个应力循环的试样在缺口的根部未发现任何非扩展裂纹，但人们认识到了清晰的耐久性极限，并且疲劳强度并未随着应力集中系数K_t的增加而连续降低。根据硬度测试，在疲劳测试过程中，由于动态应变时效而使刻痕根部硬化。随着K_t的增加，硬化行为显着发生。 K_t和硬化行为对疲劳强度的影响相互抵消，然后疲劳强度对K_t变得不敏感。通过应力增量疲劳试验获得的疲劳强度σ_（SIT）变得高于每个K试样的普通疲劳强度，即，可以清楚地识别出同轴作用。该结果表明疲劳断裂强度在疲劳试验中逐渐增加。 σ_（SIT）的峰值在K_t为2.0，并且随着K_t的增加而敏感地降低。疲劳断裂强度的增加行为取决于K_t，疲劳断裂受硬化材料的情况和考虑K_t的应力振幅的控制。

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