Investigation of Effect of Pre-Strain on Very High-Cycle Fatigue Strength of Austenitic Stainless Steels
Investigation of Effect of Pre-Strain on Very High-Cycle Fatigue Strength of Austenitic Stainless Steels
复制标题
预应变对奥氏体不锈钢超高周疲劳强度影响的研究
DOI：
10.1299/jpes.3.38
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发表时间：
2008
期刊：
影响因子：
--
通讯作者：
K. Asano
中科院分区：
文献类型：
--
作者：
T. Ogawa;M. Nakane;K. Masaki;Shota Hashimoto;Y. Ochi;K. Asano
本文介绍了大预应变对核电站中广泛使用的奥氏体不锈钢超高周疲劳强度的影响。在应变硬化试件上进行了疲劳试验。本研究所用材料为SUS316 NG型。将高达±20%的预应变引入材料，并将材料机械加工成沙漏状光滑试件。一些试件在加工后进行了预应变。在超声疲劳试验机和旋转弯曲疲劳试验机上进行了疲劳试验，得到的S-N曲线表明，预应变的大小会增加材料的疲劳强度，并且这种关系与拉压预应变的类型无关。虽然所有由表面断裂的试件都会引发疲劳裂纹，但有一个试件是由内部原因断裂的。然而，这种内部断裂并没有导致SUS316 NG型的疲劳强度突然下降。通过维氏硬度试验确定了预应变材料的疲劳强度与硬度之间的关系。结果表明，预应变材料疲劳极限的提高强烈依赖于压痕尺寸等于第一阶段疲劳裂纹尺寸所获得的硬度。
This paper describes the effect of large pre-strain on very high cycle fatigue strength of austenitic stainless steels that are widely used in nuclear power plants. Fatigue tests were carried out on strain-hardened specimens. The material served in this study was type SUS316NG. Up to ±20% pre-strain was introduced to the materials, and the materials were mechanically machined into hourglass shaped smooth specimens. Some specimens were pre-strained after machining. Experiments were conducted in ultrasonic and rotating-bending fatigue testing machines.The S-N curves obtained in this study show that an increase in the magnitude of the pre-strain increases the fatigue strength of the material and this relationship is independent of the type of the pre-strain of tension or compression. Although all specimens fractured by the surface initiated fatigue cracks, one specimen fractured by an internal origin. However, this internal fracture did not cause a sudden drop in fatigue strength of type SUS316NG. Vickers hardness tests were carried out to ascertain the relationship between fatigue strength and hardness of the pre-strained materials. It was found that the increase in the fatigue limit of the pre-strained materials strongly depended on the hardness derived from an indentation size equal to the scale of stage I fatigue cracks.
利用超声波疲劳试验评价奥氏体不锈钢的千兆周疲劳性能
DOI：
--
发表时间：
2008
期刊：
Journal of Solid Mechanics and Materials Engineeying Vol.2
影响因子：
--
作者：
Masashi Oonishi;Izuru Nishikawa;Yoshiteru Hainiwa Izuru Nishikawa;Yoshiteru Hainiwa Izuru Nishikawa;Yoshiteru Hainiwa Izuru Nishikawa;Yoshiteru Hainiwa Izuru Nishikawa;Yoshiteru Hainiwa Izuru Nishikawa;Yoshiteru Hainiwa Izuru Nishikawa;Kyouhei TAKAHASHI
通讯作者：
Kyouhei TAKAHASHI