DZ125定向凝固高温合金长期时效后的显微组织和超高周疲劳行为

材料工程与机械制造

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DZ125定向凝固高温合金长期时效后的显微组织和超高周疲劳行为

顾玉丽¹, 滕旭东², 刘昌奎¹, 何玉怀¹, 陶春虎¹

1. 北京航空材料研究院中国航空工业集团公司失效分析中心试金石检测技术有限公司, 北京 100095;
2. 中国人民解放军驻中航工业南方航空动力机械公司军事代表室, 湖南株洲 412002

收稿日期:2011-11-18 修回日期:2011-12-08 出版日期:2012-11-25 发布日期:2012-11-22
通讯作者: 顾玉丽 E-mail:bluebee4646@163.com

Microstructures and Ultra-high Cycle Fatigue Behaviors of Directionally Solidified Superalloy DZ125 After Long-term Aging

GU Yuli¹, TENG Xudong², LIU Changkui¹, HE Yuhuai¹, TAO Chunhu¹

1. Touch Stone Testing Innovation Corporation, AVIC Failure Analysis Center, Beijing Institute of Aeronautical Materials, Beijing 100095, China;
2. PLA Representative Office at AVIC South Aviation Industry Limited Corporation, Zhuzhou 412002, China

Received:2011-11-18 Revised:2011-12-08 Online:2012-11-25 Published:2012-11-22

摘要/Abstract

摘要： 选用950 ℃时效温度,对DZ125定向凝固高温合金进行了500、1 000、1 500 h的长期时效。利用超声疲劳试验机测试了合金的超高周疲劳性能。采用扫描电子显微镜、透射电子显微镜和电子背散射衍射(EBSD)研究了合金的显微组织和超高周疲劳行为。结果表明:长期时效对DZ125合金的组织稍有影响,长期时效后合金的点阵错配度降低,随着时效时间的延长,γ'相聚集长大更加明显,未出现拓扑密排相(TCP)等有害相;长期时效对DZ125合金的超高周疲劳性能稍有影响,随着时效时间的延长,疲劳性能呈下降趋势,疲劳断口较平整,裂纹起源于试样的表面,在超高周疲劳后合金的晶粒发生了小幅度旋转。

关键词: 定向凝固, 高温合金, 长期时效, 超高周疲劳, 疲劳断口, 裂纹

Abstract: Directionallly solidified superalloy DZ125 is aged at 950 ℃ for 500 h, 1 000 h and 1 500 h, respectively. The ultra-high cycle fatigue property of alloy DZ125 is measured using an ultrasonic fatigue test machine. The microstructures and ultra-high cycle fatigue behaviors of DZ125 are investigated using scan electron microscopy, transmission electron microscopy and electron backscatter diffraction (EBSD) technique. The results show that the effect of long-term aging heat treatments on the microstructures of DZ125 is small, and the lattice misfit is reduced after long-term aging. With the increase of the aging time, γ' phases accumulate and grow obviously, but the topologically close packed(TCP)phase is not found. The effect of long-term aging heat treatments on the ultra-high cycle fatigue properties is small. With the increase of the aging time, the ultra-high cycle fatigue property shows a downward trend .The fatigue fracture surface is perpendicular to the stress axis/fatigue cracks initiate from the sample surface, and the grain rotation angle is small after ultra-high cycle fatigue tests.

Key words: directionally solidification, superalloy, long-term aging, ultra-high cycle fatigue, fatigue fracture, cracks

中图分类号:

V252
TG11

顾玉丽, 滕旭东, 刘昌奎, 何玉怀, 陶春虎. DZ125定向凝固高温合金长期时效后的显微组织和超高周疲劳行为[J]. 航空学报, 2012, 33(11): 2136-2142.

GU Yuli, TENG Xudong, LIU Changkui, HE Yuhuai, TAO Chunhu. Microstructures and Ultra-high Cycle Fatigue Behaviors of Directionally Solidified Superalloy DZ125 After Long-term Aging[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2012, 33(11): 2136-2142.

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E-mail：hkxb@buaa.edu.cn

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DZ125定向凝固高温合金长期时效后的显微组织和超高周疲劳行为

Microstructures and Ultra-high Cycle Fatigue Behaviors of Directionally Solidified Superalloy DZ125 After Long-term Aging

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