Effects of stress ratio on the temperature-dependent high-cycle fatigue properties of alloy steels

Abstract

This paper addresses the effects of stress ratio on the temperature-dependent high-cycle fatigue (HCF) properties of alloy steels 2CrMo and 9CrCo, which suffer from substantial vibrational loading at small stress amplitude, high stress ratio, and high frequency in the high-temperature environments in which they function as blade and rotor spindle materials in advanced gas or steam turbine engines. Fatigue tests were performed on alloy steels 2CrMo and 9CrCo subjected to constant-amplitude loading at four stress ratios and at four and three temperatures, respectively, to determine their temperature-dependent HCF properties. The interaction mechanisms between high temperature and stress ratio were deduced and compared with each other on the basis of the results of fractographic analysis. A phenomenological model was developed to evaluate the effects of stress ratio on the temperature-dependent HCF properties of alloy steels 2CrMo and 9CrCo. Good correlation was achieved between the predictions and actual experiments, demonstrating the practical and effective use of the proposed method.

Keywords

alloy steel / metal fatigue / fatigue properties / elevated temperature / stress ratio

References

[1] Zhou Y., Wang J.Q., Zhang B., Ke W., Han E.H. High-temperature fatigue property of Ti46Al8Nb alloy with the fully lamellar microstructure. Intermetallics, 2012, 24(4): 7.

[2] Zimmermann M., Stoecker C., Christ H.J. High Temperature fatigue of nickel-based superalloys during high frequency testing. Procedia Eng., 2013, 55(12): 645.

[3] Yang X.G., Li S.L., Qi H.Y. Effect of MCrAlY coating on the low-cycle fatigue behavior of a directionally solidified nickel-base superalloy at different temperatures. Int. J. Fatigue, 2015, 75, 126.

[4] Rozman K.A., Kruzic J.J., Hawk J.A. Fatigue crack growth behavior of nickel-base superalloy Haynes 282 at 550-750°C. J. Mater. Eng. Perform., 2015, 24(8): 2841.

[5] Kim I.S., Choi B.G., Jung J.E., Do J., Jo C.Y. Effect of microstructural characteristics on the low cycle fatigue behaviors of cast Ni-base superalloys. Mater. Charact., 2015, 106, 375.

[6] Kulawinski D., Weidner A., Henkel S., Biermann H. Isothermal and thermo-mechanical fatigue behavior of the nickel base superalloy Waspaloy™ under uniaxial and biaxial-planar loading. Int. J. Fatigue, 2015, 81, 21.

[7] Kumar D., Pandey K.N., Das D.K. Microstructure studies of air-plasma-spray-deposited CoNiCrAlY coatings before and after thermal cyclic loading for high-temperature application. Int. J. Miner. Metall. Mater., 2016, 23(8): 934.

[8] Šmíd M., Horník V., Hutař P., Hrbáček K., Kunz L. High cycle fatigue damage mechanisms of MAR-M 247 superalloy at high temperatures. Trans. Indian. Inst. Met., 2016, 69(2): 393.

[9] Shi Z.X., Li J.R., Liu S.Z., Han M. High cycle fatigue behavior of the second generation single crystal superalloy DD6. Trans. Nonferrous Met. Soc. China, 2011, 21(5): 998.

[10] Dong X.G., Zhou J., Jia Y.J., Liu B. Effect of alloying on high temperature fatigue performance of ZL114A (Al-7Si) alloy. Trans. Nonferrous Met. Soc. China, 2012, 22(3): s661.

[11] Horke K., Ruderer B., Singer R.F. Influence of sintering conditions on tensile and high cycle fatigue behaviour of powder injection moulded Ti-6Al-4V at ambient and elevated temperatures. Powder. Metall., 2014, 57(4): 283.

[12] Larrouy B., Villechaise P., Cormier J., Berteaux O. Grain boundary–slip bands interactions: impact on the fatigue crack initiation in a polycrystalline forged Ni-based superalloy. Acta. Mater., 2015, 99, 325.

[13] Stinville J.C., Lenthe W.C., Miao J., Pollock T.M. A combined grain scale elastic–plastic criterion for identification of fatigue crack initiation sites in a twin containing polycrystalline nickel-base superalloy. Acta. Mater., 2016, 103, 461.

[14] Qiu W.H., He Z.W., Fan Y.N., Shi H.J., Gu J.L. Effects of secondary orientation on crack closure behavior of nickel-based single crystal superalloys. Int. J. Fatigue., 2016, 83, 335.

[15] Berto F., Lazzarin P., Gallo P. High-temperature fatigue strength of a copper–cobalt–beryllium alloy. J. Strain Anal. Eng. Des, 2013, 49(4): 244.

[16] Gallo P., Berto F., Lazzarin P., Luisetto P. High temperature fatigue tests of Cu-Be and 40CrMoV13.9 alloys. Procedia Mater. Sci., 2014, 3, 27.

[17] Shi Z.X., Han M., Liu S.Z., Li J.R. Influence of cast dimension on rotary bending high cycle fatigue properties of single crystal superalloy. J. Iron. Steel. Res. Int., 2013, 20(12): 98.

[18] Cruchley S., Li H.Y., Evans H.E., Bowen P., Child D.J., Hardy M.C. The role of oxidation damage in fatigue crack initiation of an advanced Ni-based superalloy. Int. J. Fatigue, 2015, 81, 265.

[19] Zimmermann M., Stöcker C., Christ H.J. On the effects of particle strengthening and temperature on the VHCF behavior at high frequency. Int. J. Fatigue, 2011, 33(1): 42.

[20] Lü X.M., Li S.L., Zhang H.L., Wang Y.L., Wang X.T. Effect of thermal aging on the fatigue crack growth behavior of cast duplex stainless steels. Int. J. Miner. Metall. Mater., 2015, 22(11): 1163.

[21] Zhang C.J., Hu W.B., Wen Z.X., Zhang H.C., Yue Z.F. Influence of hot isostatic pressing on fatigue performance of K403 nickel-based superalloy. J. Alloys Compd., 2016, 655, 114.

[22] Mansuri M., Hadavi S.M.M., Zare E. Effect of Al-Si pack cementation diffusion coating on high-temperature low-cycle fatigue behavior of Inconel 713LC. Metall. Mater. Trans. A, 2016, 47(1): 293.

[23] Morrissey R.J., John R., Porter J.W.III. Fatigue variability of a single crystal superalloy at elevated temperature. Int. J. Fatigue, 2009, 31(11-12): 1758.

[24] Jiang L., Brooks C.R., Liaw P.K., Wang H., Rawn C.J., Klarstrom D.L. High-frequency metal fatigue: the high-cycle fatigue behavior of ULTIMET® alloy. Mater. Sci. Eng. A, 2001, 314(1-2): 162.

[25] ASTM E468-90. Standard Practice for Presentation of Constant Amplitude Fatigue Test Results for Metallic Materials, 1990

[26] ASTM E739-91. Standard Practice for Statistical Analysis of Linear or Linearized Stress-life (S-N) and Strain-life (e-N) Fatigue Data, 1991

[27] Xiong J.J., Shenoi R.A. Fatigue and Fracture Reliability Engineering, 2011, London, Springer, 7.