|
| 镍基单晶高温合金薄壁试样的高温超高周振动疲劳实验研究 |
| VHCF experimental study on of thin-walled Ni-based single crystal superalloy specimens at high temperature |
| 投稿时间：2024-06-17 修订日期：2024-07-31 |
| DOI： |
| 中文关键词: 镍基单晶高温合金 薄壁效应 超高周振动疲劳 高温实验 |
| 英文关键词:nickel-based single crystal superalloys thickness debit effect VHCF vibration fatigue high temperature test |
| 基金项目: |
|
| 摘要点击次数: 511 |
| 全文下载次数: 0 |
| 中文摘要: |
| 本研究以国产第二代镍基单晶高温合金DD6为研究对象，针对航空发动机涡轮叶片薄壁特征对DD6合金超高周疲劳性能的影响开展实验研究。首先，自主设计了分别适用于室温和高温条件下的3种厚度（0.5 mm、1.0 mm和1.5 mm）的薄壁试样，然后，建立了针对单晶薄壁试样的高温超高周振动疲劳实验系统，分别开展了薄壁试样在室温和850℃条件下的超高周振动疲劳实验，获取了最高循环数达109周次的疲劳S-N曲线，并和相同温度下的旋转弯曲疲劳实验结果进行了对比，最后开展了厚度和温度对薄壁试样疲劳性能影响的分析。结果表明：室温条件下0.5mm薄壁试样的疲劳强度相较于其他2种厚度试样的疲劳强度并未见明显弱化；而在850℃时，0.5mm薄壁试样的疲劳强度明显低于其他2种厚度试样的疲劳强度，表现出明显的薄壁效应，且在超高周疲劳循环区间内表现尤为显著。另外，1.0mm和1.5mm薄壁试样疲劳性能与相同温度下旋转弯曲疲劳性能接近。 |
| 英文摘要: |
| This study focuses on a single crystal superalloy DD6, aiming to investigate the influence of thin-walled characteristics on the VHCF performance. The influence of wall thickness and test temperature on the VHCF performance and failure mechanism were investigated. Firstly, three types of thin-walled specimens with different thicknesses (0.5 mm, 1.0mm and 1.5mm) were designed for testing at room temperature and high temperature. Then, a high-temperature vibration fatigue experimental system was established for the thin-walled specimens. Vibration fatigue experiments were conducted at room temperature and 850 ℃, respectively. The fatigue S-N curve with a maximum cycle number of 109 cycles was obtained, and compared with the results of rotational bending fatigue at the same temperature. Finally, the influence of thickness and temperature on the fatigue performance of thin-walled specimens was analyzed. The results show that the fatigue strength of the 0. 5 mm thin-walled specimen is the highest under room temperature conditions, and no thickness debit effect is observed. But the fatigue strength of the 0.5 mm thin-walled specimen is significantly lower than that of the other two thicknesses of specimens at 850℃, exhibiting a significant thickness debit effect. In addition, the fatigue strengths of the 1.0 and 1.5 mm thin-walled specimens and the rotating bending fatigue specimens are close |
| 下载PDF阅读器 |
| 关闭 |
