| 铸造镍基高温合金K435室温旋转弯曲疲劳行为 |
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| 引用本文： | 郭晓光,郭建亭,周兰章,杨洪才.铸造镍基高温合金K435室温旋转弯曲疲劳行为[J].东北大学学报(自然科学版),2007,28(3):357-360. |
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| 作者姓名： | 郭晓光 郭建亭 周兰章 杨洪才 |
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| 作者单位： | 1. 东北大学,材料与冶金学院,辽宁,沈阳,110004
2. 中国科学院金属研究所,高温合金研究室,辽宁,沈阳,110016 |
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| 摘 要： | 在应力比R=-1,转速为5000 r/min(83.3 Hz)和实验室静态空气介质环境下,研究了抗热腐蚀铸造镍基高温合金K435的旋转弯曲疲劳行为,得到其应力-疲劳寿命(S-Nf)曲线,测出其室温旋转弯曲疲劳极限为220 MPa.用扫描电镜观察了疲劳断口形貌,发现裂纹主要萌生在试样表面或近表面缺陷处,断口主要由裂纹萌生区、裂纹稳态扩展区和瞬间断裂区组成;并讨论了K435合金疲劳断裂的机制.用透射电镜观察了合金微观组织的变化.
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| 关 键 词： | K435合金 旋转弯曲疲劳 疲劳裂纹 裂纹扩展 疲劳极限 |
| 文章编号： | 1005-3026（2007）03-0357-04 |
| 收稿时间： | 2006-03-22 |
| 修稿时间： | 2006-03-22 |
Rotational Bending Fatigue Behavior of Ni-Based Casting Superalloy K435 at Room Temperature |
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| GUO Xiao-guang,GUO Jian-ting,ZHOU Lan-zhang,YANG Hong-cai.Rotational Bending Fatigue Behavior of Ni-Based Casting Superalloy K435 at Room Temperature[J].Journal of Northeastern University(Natural Science),2007,28(3):357-360. |
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| Authors: | GUO Xiao-guang GUO Jian-ting ZHOU Lan-zhang YANG Hong-cai |
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| Institution: | (1) School of Materials and Metallurgy, Northeastern University, Shenyang 110004, China; (2) Department of Superalloys, Institute of Metal Research, Chinese Acad. of Sci., Shenyang 110016, China |
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| Abstract: | Investigates the rotational bending fatigue behavior of Ni-based casting superalloy K435 at room temperature where the stress ratio of specimen equals-1 and specimens are rotating at 5 000 r/min(83.3 Hz).The stress-fatigue life curve relevant to rotational bending was obtained and the fatigue limit was measured to be 220 MPa.The fatigue fracture surface morphology was observed by SEM,and the fatigue cracks were found mainly initiated at the defects on specimen surface and/or near its sub-surface.The micrographics showed that the fracture is mainly due to the crack initiation,steady crack propagation and instantaneous fracture.Discusses the mechanism of the fatigue fracture of K435 superalloy and observes the change of its microstructure by TEM. |
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| Keywords: | K435 alloy rotational bending fatigue fatigue crack crack propagation fatigue limit |
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