HIGH-CYCLE FATIGUE BEHAVIOR OF K416B Ni-BASED CASTING SUPERALLOY AT 700 degrees C

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	HIGH-CYCLE FATIGUE BEHAVIOR OF K416B Ni-BASED CASTING SUPERALLOY AT 700 degrees C
	Xie Jun; Yu Jinjiang; Sun Xiaofeng; Jin Tao
刊名	ACTA METALLURGICA SINICA
	2016-03-11
卷号	52 期号:3 页码:257-263
关键词	K416B Ni-based superalloy high-cycle fatigue deformation mechanism fracture feature
ISSN号	0412-1961
通讯作者	Yu Jinjiang(jjyu@imr.ac.cn)
英文摘要	Ni-based speralloys have been widely used to make the blade parts of the advanced aeroengines for their high temperature tolerance and good mechanical property. During high temperature service, the materials endure the effects of temperature and alternating load, causing high-cycle fatigue deformation on the hot-end components. Meanwhile, the fatigue behaviors of the alloy are closely related to the deformation mechanisms and its microstructure characteristics, such as the size, distribution and morphology of gamma' phase and carbides, and the fatigue fracture of the using materials possesses unpredictability. Therefore, investigating fatigue behaviors of the material is of significance in alloy design and life prediction. But the high-cycle fatigue behavior of K416B superalloy with high W content is still unclear up to now. For this reason, by means of high-cycle fatigue property measurement and microstructure observation, the high-cycle fatigue behavior of K416B Ni-based superalloy at 700 degrees C has been investigated. The results show that at 700 degrees C and stress ratio R=-1, the high-cycle fatigue life of K416B super alloy decreases with the stress increasing, and high-cycle fatigue strength of the alloy is 175 MPa. At the condition of low stress amplitude, the deformed dislocations may slip along different orientations in the matrix. With the stress amplitude increasing, the dislocations may shear into gamma' phase and form the stacking fault. During tension and compression high-cycle fatigue, multiple slip systems are activated in the alloy, and the distortion occurs along various directions, resulting in stress concentration on the regions of gamma+gamma' eutectic and carbides. The crack sources may be initiated at the eutectic and blocky carbide near the surface of the alloy. As high-cycle fatigue goes on, the cracks propagate along the inter-dendrite in expansion 'region, and the typical cleavage fracture occurs in the final rupture region.
WOS研究方向	Metallurgy & Metallurgical Engineering
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000372691500001
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/121832]
专题	金属研究所_中国科学院金属研究所
通讯作者	Yu Jinjiang
作者单位	Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Xie Jun,Yu Jinjiang,Sun Xiaofeng,et al. HIGH-CYCLE FATIGUE BEHAVIOR OF K416B Ni-BASED CASTING SUPERALLOY AT 700 degrees C[J]. ACTA METALLURGICA SINICA,2016,52(3):257-263.
APA	Xie Jun,Yu Jinjiang,Sun Xiaofeng,&Jin Tao.(2016).HIGH-CYCLE FATIGUE BEHAVIOR OF K416B Ni-BASED CASTING SUPERALLOY AT 700 degrees C.ACTA METALLURGICA SINICA,52(3),257-263.
MLA	Xie Jun,et al."HIGH-CYCLE FATIGUE BEHAVIOR OF K416B Ni-BASED CASTING SUPERALLOY AT 700 degrees C".ACTA METALLURGICA SINICA 52.3(2016):257-263.