Quantitative Analysis on Fatigue Fracture of Spray Formed GH738 Alloy

Abstract:

Low-cycle fatigue (LCF) fracture of the spray formed GH738 alloy was investigated under total strain controlled mode at 650°C. Basic theory for evaluating fatigue lives by fatigue striations has been introduced. The crack length a and the crack propagation rate da/dN were measured and the curve of da/dN in crack propagation zone was obtained with Paris formula and tabulation trapezoidal formula, respectively. The size and symmetry of rapid fracture zone of fatigue were also studied. The results showed that the relationship of a and N was linear with tabulation trapezoidal formula, and the da/dN and a was conic with Paris formula. At last, quantitative analysis of fatigue fracture was also discussed.

• Periodical: Materials Science Forum (Volumes 747-748)
• Pages: 564-568
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.747-748.564
• Online since: February 2013
• Authors: Dong Ye Yang, Wen Yong Xu, Zhou Li, Guo Qing Zhang, Zhing Liang Ning, Jian Fei Sun
• Keywords: Fracture Analysis, GH738 Alloy, Low-Cycle Fatigue, Spray Forming

References

[1] G. Shen, S. L Semiatin, R. Shivpuri, Modeling microstructural development during the forging of Waspaloy, Metallurgical and Materials Transactions A. 26 (1995) 1795-1803.

DOI: 10.1007/bf02670767

[2] W.Y. Xu, G.Q. Zhang, Z. Li, Low Cycle Fatigue Behavior of Spray Formed Superalloy Rings, Advanced Materials Research. 399 (2012) 1937-(1941).

DOI: 10.4028/www.scientific.net/amr.399-401.1937

[3] H. Yuan, Z. Li, G.Q. Zhang, W.Y. Xu, N. Liu, Y. Zhang, S.F. Tian, The study of microstructures and properties of spray formed superalloy GH738 ring, Journal of Iron and Steel Research. Vol. 23 (2011).

[4] N. Liu, Z. Li, G. Zhang, Hot deformation behavior and microstructure evolution of spray formed GH738 superalloy, Rare Metals. 30 (2011) 388-391.

DOI: 10.1007/s12598-011-0309-2

[5] E. Lavernia, N.J. Grant, Spray deposition of metals: a review, Materials Science and Engineering. 98 (1988) 381-394.

DOI: 10.1016/0025-5416(88)90191-7

[6] D.L. Davidson, R.G. Tryon, M. Oja, R. Matthews, K.S. Ravi Chandran, Fatigue crack initiation in Wasploy at 20°C, Metallurgical and materials transactions A. 38 (2007) 2214-2225.

DOI: 10.1007/s11661-007-9178-6

[7] X.B. Liu, L.Z. Ma, K.M. Changand, E. Barbero, Fatigue crack propagation of Ni-base superalloys, Acta Metallurgica sinica A. 18 (2005) 55-64.

[8] E. Hershko, N. Mandelker,G. Gheorghiu, etc, Assessment of fatigue striation counting accuracy using high resolution scanning electron microscope, Engineering Failure Analysis. 15 (2007) 20-27.

DOI: 10.1016/j.engfailanal.2007.01.005

[9] X.Q. Hou, J.J. Fan, Z.B. Wang, Quantitative analysis on fatigue fracture of FGH95 alloy, Journal of Iron and Steel Research. Vol. 23 (2011) 471.

[10] Y. Zhang, W.F. Zhang, H. Yan, Quantitative analysis in evaluating fatigue Lives of components, Journal of Materials Engineering. (2000) 45-48.

[11] Z.H. Zhao, Z. Zhang, S.J. Wu, Q.P. Zhong, Survey of quantitiative reverse deduction from fatigue fracture suface of metals, Journal of Mechanical Strength. 30 (2008) 508.

[12] X.L. Zhang, Z. Zhang, C.H. Tao, Fatigue fractography quantitative analysis, National defense industry, (2010).

[13] C.Y. Chen, Fatigue and fracture, Huazhong university of science and technology press, (2002).

[14] S. Surech, Fatigue of materials, Cambridge university press, (1991).