TMF of Directionally Solidified and Single Crystal Superalloy

Abstract:

Directional solidification and single crystal technology reduces material defects, improves material mechanical property and improves resistances to the high temperature fatigue, creep and corrosion. Accumulation of fatigue damage is a method of life prediction analysis and many fatigue damage models are proposed. Based on foregone research achievements, this paper presents a fatigue damage model, which could reflect material anisotropy and thermomechanical coupling effect. Based on equivalent strain, a fatigue damage evaluation method of directionally solidified and single crystal superalloy is presented and by this method, the linear fit of published fatigue experiment data is proceeded. Directionally solidified and single crystal superalloy is of strong anisotropy and crystal orientation has strong effect on component mechanical response. Comparative life of different location on component could be analyzed.

• Periodical: Advanced Materials Research (Volumes 233-235)
• Pages: 2227-2230
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.233-235.2227
• Online since: May 2011
• Authors: Qing Wu Wang, Shi Hui Zhang, Mao Pang
• Keywords: Directionally Solidified Superalloy, Fatigue Damage Model, FCG, Local Damage Factor, Single Crystal, TMF

References

[1] PEARSON. S:Fatigue crack propagation in metals. Nature. vol.211 (1966), pp.1077-1078

DOI: 10.1038/2111077a0

[2] C.A. Rau, Jr., A. E. Gemma, and G.R. Leverant:Thermal-Mechanical Fatigue Crack Propagation in Nickel- and Cobalt-Base Superalloys Under Various Strain-temperature Cycles. Fatigue at Elevated Temperatures, ASTM STP520. American Society for Testing and Materials, (1973), pp.166-178

DOI: 10.1520/stp38838s

[3] A. E. Gemma and J. S. Phillips:The Application of Fractured Mechanics to Life Prediction of Cooling Hole Configurations in Thermal-Mechanical Fatigue. Engineering Fracture Mechanicas.Vol. 9 (1977),pp.25-36

DOI: 10.1016/0013-7944(77)90049-2

[4] P.T. Bizon, R.L. Dreshfield, and F.D. Calfo:Effect of Grain Orientation and Coating on Thermal Fatigue Resistance of a Directionally Solidified Superalloy(Mar-m247) NASA Technical Memorandum 79129, April (1979)

[5] C.A. Rau, Jr., A. E. Gemma, and G.R. Leverant:in Fatigue at Elevated Temperatures, ASTM STP 520, American Society for Testing and Materials, 1973, pp.166-178.

[6] D. L. Anton: Low Cycle Fatigue Characteristics of <001> and Randomly Aligned Superalloy Single Crystals, Acta Met., 32, No. 10, 1669-1679 (1984).

DOI: 10.1016/0001-6160(84)90223-2

[7] Dalal, R. P., Thomas, C. R., and Dardi, L. E.:The Effect of Crystallographic Orientation on the Physical and Mechanical Properties of an Investment Cast Single Crystal Nickel-Base Superalloy, Superalloys, M. Gell, C. S. Kortovich, R. H. Bricknell, W. B. Kent, and J. F. Radavich, eds., TMS-AIME, Warrendale, OH, p.185–197. (1984)

DOI: 10.7449/1984/superalloys_1984_185_197

[8] DING Zhi-ping; CHEN Ji-ping; YIN Ze-yong; YANG Zhi-guo:Low-Cycle Fatigue Life Prediction of Single Crystal Nickel-Based Superalloys under Asymmetrical Cyclic Loading.Journal of Aeronautical Materials. Vol. 26(2006),pp.6-10

[9] Yue Zhufeng,at al.:A Crystallographic Model for the Orientation Dependence of Low Cyclic Fatigue Property of a Nickel–Based single crystal superalloy.Applied Mathematics and Mechanics(English Edition). Vol. 21(2000),pp.415-424

DOI: 10.1007/bf02463763

[10] LI Ying; SU Bin:Mechanisms of Low Cyclic Fatigue of DD6 Alloy at Elevated Temperature. Journal of Aerospace Power. Vol.118(2003),p.732～736