Nondestructive Evaluation of High Temperature Low-Cycle Fatigue Damage Accumulation in Inconel 718 by Chemical Method
Nondestructive Evaluation of High Temperature Low-Cycle Fatigue Damage Accumulation in Inconel 718 by Chemical Method
复制标题
化学法无损评价Inconel 718高温低周疲劳损伤累积
DOI：
10.7449/1997/superalloys_1997_617_628
复制
发表时间：
1997
期刊：
影响因子：
--
通讯作者：
T. Shoji
中科院分区：
文献类型：
--
作者：
S. Komazaki;Yutaka Watanabe;T. Shoji
为了开发用于H-II火箭发动机部件的Inconel 718合金疲劳损伤的无损评估方法，研究了疲劳寿命分数与腐蚀截面上观察到的裂纹和滑移带之间的相关性。得到的主要结果如下。(1)随着疲劳寿命分数N/Nf的增加，裂纹数量和最大裂纹深度增大。在疲劳寿命的早期，裂纹的最大深度没有明显增加，而在疲劳寿命的后半期，裂纹扩展较快。(2)滑移带密度可以唯一地与疲劳寿命分数N/Nf相关。用N/Nf表示的疲劳损伤可以用化学腐蚀技术来评估，并且可以从疲劳寿命的早期阶段到最后阶段来评估损伤。高温合金718、625、706和各种衍生物矿物、金属和材料协会，1997年
In order to develop nondestructive evaluation procedure of fatigue damage in Inconel 718 which is used for components of H-II rocket engine, we investigated correlation between the fatigue life fraction and cracks and slip bands which were observed on the etched cross sectional surface of the fatigued specimens. The main results obtained are as follows. (1) The number of cracks and maximum crack depth become large with increased the fatigue life fraction N/Nf. However, maximum crack depth does not remarkably increase in early stage of the fatigue life, while cracks propagate rather fast in the latter half of the fatigue life. (2) The slip band density can be uniquely correlated with the fatigue life fraction N/Nf. The fatigue damage represented by N/Nf can be evaluated by the chemical etching technique and the damage can be evaluated from the early stage to the last stage of fatigue life. Superalloys 718,625, 706 and Various Derivatives Edited by E.A. Loria The Minerals, Metals &Materials Society, 1997 617