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[1]史振学,赵金乾,刘世忠.表面缺陷对单晶高温合金高周疲劳性能的影响[J].有色金属科学与工程,2018,(06):50-54.[doi:10.13264/j.cnki.ysjskx.2018.06.008]
 SHI Zhenxue,ZHAO Jinqian,LIU Shizhong.Effect of surface defects on the high cycle fatigue properties of a single crystal superalloy[J].,2018,(06):50-54.[doi:10.13264/j.cnki.ysjskx.2018.06.008]
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表面缺陷对单晶高温合金高周疲劳性能的影响(/HTML)
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《有色金属科学与工程》[ISSN:1674-9669/CN:36-1311/TF]

卷:
期数:
2018年06期
页码:
50-54
栏目:
出版日期:
2018-12-25

文章信息/Info

Title:
Effect of surface defects on the high cycle fatigue properties of a single crystal superalloy
作者:
史振学赵金乾刘世忠
(北京航空材料研究院 先进高温结构材料重点实验室, 北京100095)
Author(s):
SHI Zhenxue ZHAO Jinqian LIU Shizhong
(Science and Technology on Advanced High Temperature Structural Materials Laboratory, Beijing Institute of Aeronautical Materials, Beijing 100095 )
关键词:
单晶高温合金 表面缺陷表面孔洞高周疲劳
分类号:
TG132.3+2
DOI:
10.13264/j.cnki.ysjskx.2018.06.008
文献标志码:
A
摘要:
在定向凝固炉中采用螺旋选晶法制备了一种单晶高温合金试棒,标准热处理后加工成旋转弯曲高周疲劳试样,试样中间位置用电火花加工成不同尺寸的孔洞以模拟叶片的表面缺陷,在980 ℃、应力分别为400 MPa 和500 MPa 条件下,研究表面孔洞对合金高周疲劳性能的影响,用扫描电镜分析了疲劳试样的断口形貌。结果表明与标准试样相比,带有孔洞合金的高周疲劳寿命都有不同程度地降低,随着表面孔洞尺寸增大,合金的疲劳寿命逐渐减小。在合金试样的高周疲劳断口上可见疲劳源区、裂纹扩展区和瞬断区。相对于标准试样,带有孔洞试样疲劳源除了试样表面,还有表面孔洞,所有试样都为多源疲劳断裂。与高温下拉伸持久的断裂机制不同,高温下旋转弯曲高周疲劳为类解理断裂。

参考文献/References:


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备注/Memo

备注/Memo:
收稿日期:2018-0-26
基金项目:重点实验室基金项目资助(9140C430101120C4301)
通信作者:史振学,(1975- ),男,博士,高级工程师,主要从事单晶高温合金方面的研究. Email:shizhenxue@126.com.
更新日期/Last Update: 2018-12-20