Fatigue crack growth characteristics of a new Ni-Co-base superalloy TMW-4M3: effects of temperature and load ratio

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	Fatigue crack growth characteristics of a new Ni-Co-base superalloy TMW-4M3: effects of temperature and load ratio
	Z. H. Zhong ; Y. F. Gu ; T. Osada ; Y. Yuan ; C. Y. Cui ; T. Yokokawa ; T. Tetsui ; H. Harada
刊名	Journal of Materials Science
	2011
卷号	46 期号:23 页码:7573-7581
关键词	nickel-based superalloy elevated-temperature stress ratio wave-form alloy 718 behavior creep oxidation micromechanisms microstructure
ISSN号	0022-2461
中文摘要	The fatigue crack growth (FCG) behavior of a newly developed Ni-Co-base superalloy TMW-4M3 has been investigated in this study. Experiment was carried out in laboratory air with compact-tension specimen. The effects of temperature (400, 650, and 725 degrees C) and load ratio (0.05 and 0.5) on crack growth rate were studied in the Paris regime. The results revealed that the crack growth rate increased with increasing temperature under a given load ratio. The influence of load ratio on crack growth rate was pronounced, especially at higher temperature and low stress intensity factor range. Fractographic observations showed that fracture mode was transgranular at 400 degrees C, mixed transgranular and intergranular at 650 degrees C, and predominantly intergranular at 725 degrees C. The possible explanations for the crack growth behavior were discussed based on the degradation of mechanical properties and the oxidation assisted crack growth, as well as the crack closure effect. A comparison of FCG rate was also made between TMW-4M3 and the commercial superalloy U720Li.
原文出处	://WOS:000295179700028
公开日期	2012-04-13
内容类型	期刊论文
源URL	[http://210.72.142.130/handle/321006/30980]
专题	金属研究所_中国科学院金属研究所
推荐引用方式 GB/T 7714	Z. H. Zhong,Y. F. Gu,T. Osada,et al. Fatigue crack growth characteristics of a new Ni-Co-base superalloy TMW-4M3: effects of temperature and load ratio[J]. Journal of Materials Science,2011,46(23):7573-7581.
APA	Z. H. Zhong.,Y. F. Gu.,T. Osada.,Y. Yuan.,C. Y. Cui.,...&H. Harada.(2011).Fatigue crack growth characteristics of a new Ni-Co-base superalloy TMW-4M3: effects of temperature and load ratio.Journal of Materials Science,46(23),7573-7581.
MLA	Z. H. Zhong,et al."Fatigue crack growth characteristics of a new Ni-Co-base superalloy TMW-4M3: effects of temperature and load ratio".Journal of Materials Science 46.23(2011):7573-7581.