Optimization of thermomechanical parameters to produce an ultra-high strength compressor disk

Document Type : Research Paper

Authors

Faculty of Materials Science and Engineering, K.N. Toosi University of Technology, Postal Code: 1999143344, Tehran, Iran

Abstract

Structural steels with very high strength levels are often referred to as ultrahigh-strength steels (UHSS). The usage of UHSS has been extensively studied in aerospace industries and offshore platforms. In this study, medium carbon low alloy steel (AMS6305) was thermomechanicaly treated to obtain an ultra-high strength bainitic steel for aircraft engine compressor disk. A novel themomechanical treatment was introduced to optimize microstructure and mechanical properties. By replacing the common quench-temper microstructure of compressor disk with bainite microstructure, an ultra-high strength bainitic steel was achieved. Based on the results obtained, the final microstructures following pre-deformation and subsequent heat treatment showed a very good combination of strength and toughness. Furthermore, it has been shown that austempering time and temperature play a major role in achieving ultra-high strength bainitic steels. The optimized strength and toughness was achieved by up quenching treatment. This is due to partitioning of prior austenite grains by tempered martensite plates.

Keywords

References

 [1] M. Jahazi and B. Eghbali, The influence of hot rolling parameters on the microstructure and mechanical properties of an ultra-high strength steel, Journal of Materials Processing Technology, 103(2000) 276-279.
[2] W.S. Lee and T.T. Su, Mechanical properties and microstructural features of AISI4340 high strength alloy steel under quenched and tempered conditions, Journal of Materials Processing Technology, 87(1999) 198-206.
[3] A.A. Barani, F. Li, P. Romano, D. Ponge and D. Raabe, Design of high-strength steels by microalloying and thermomechanical treatment, Materials Science and Engineering A, 463(2007) 138-146.
[4] K. Sato, Improving the toughness of ultrahigh strength steel [Dissertation] (in Japan), Kyoto, Kyoto University, (2002).
[5] S. Gunduz and R.C. Cochrane, Influence of cooling rate and tempering on precipitation and hardness of vanadium microalloyed steel, Materials and Design, 26(2005) 486-492.
[6] Y. Tomita, Effect of modified austemper on tensile properties of 0·52%C steel, Materials Science and Technology, 11(1995) 994-997.
[7] Z. Li and D. Wu, Effects of holding temperature for austempering on mechanical properties of Si-Mn TRIP steel, Journal of Iron and Steel Researh, 11(2004) 40-44.
[8] A.D. Basso, R.A. Martinez and J.A. Sikora, Influence of austenitizing temperature on microstructure and properties of dual phase ADI, Materials Science and Technology, 23(2007) 1321-1326.
[9] M. Takahashi and H.K.D.H. Bhadeshia, A model for the microstructure of some advanced bainitic steels, Materials Transactions JIM, 32(1991) 689-696.
[10] J. M. Tartaglia, K.A. Lazzari, G.P. Hui and K.L. Hayrynen, A comparison of mechanical properties and hydrogen embrittlment resistance of austempered vs quenched and tempered 4340 steel, Metallurgical and Materials Transactions A, 39(2008) 559-576.
[11] S.B. Singh and H.K.D.H. Bhadeshia, Estimation of bainite plate-thickness in low-alloy steels, Materials Science and Engineering A, 245(1998) 72-79.
[12] M.Y. Tu, C.A. Hsu, W.H. Wang, Y.F. Hsu, Comparison of microstructure and mechanical behavior of lower bainite and tempered martensite in JIS SK5 steel, Materials Chemistry and Physics, 107(2008) 418-425.
[13] A.R. Mirak and M. Nili Ahmadabadi, Effect of modified heat treatments on the microstructure and mechanical properties of a low alloy high strength steel, Materials Science and Technology, 20(2004) 897-902.
[14] C.D. Liu and P.W. Kao, Tensile properties of a 0.34C-3Ni-Cr-Mo-V steel with mixed lower bainite – martensite structure, Materials Science and Engineering A, 150(1992) 171-177.
[15] K. Zhu, O. Bouaziz, C. Oberbilling and M. Huang, An approach to define the effective lath size controlling yield strength of bainite, Materials Science and Engineering A, 527(2010) 6614-6619.
[16] ASM Metal Handbook, Heat treatment, 10th edition, Vol. 4(1990) Materials Park, OH.
[17] P.H. Shipway and H.K.D.H. Bhadeshia, The effect of small stresses on the kinetics of the bainite transformation, Materials Science and Engineering A, 201(1995) 143-149.
[18] M. Takahashi, Recent progress: kinetics of the bainite transformation in steels, Current Opinion in Solid State and Materials Science, 8(2004) 213-217.
[19] A.G. Rakhshtadt , K.A. Lanskaya and V.V. Goryachev, Solution and precipitation of carbide phase in medium-carbon steels, Metal Science and Heat Treatment, 23(1981) 98-103.
[20] C. Garcia-Mateo and F.G. Caballero, Ultra high strength bainitic steels, ISIJ International, 45(2005) 1736-1740.
[21] M. Gomez, S.F. Medina, A. Quispe and P. Valles, Static recrystallization and induced precipitation in a low Nb microalloyed steel, ISIJ International, 42(2002) 423-431.
[22] Y. Chen, D. Zhang, Y. Liu, H. Li and D. Xu, Effect of dissolution and precipitation of Nb on the formation of acicular ferrite/bainite ferrite in low-carbon HSLA steels, Materials Characterization, 84(2013) 232-239.
Iranian Journal of Materials Forming
Volume 2, Issue 2 - Serial Number 2
October 2015
Pages 54-61

Files

Share

How to cite

Statistics