The influence of kinetics phase transformation during tempering on the mechanical properties of HS6-5-2 steel

• Autorzy: Bała P. , Pacyna J.
• Języki publikacji: PL

Abstrakty

EN

Purpose: The reason for writing this paper was to describe the kinetics of phase transformations during tempering and the evaluation of the influence of pre-tempering on the properties of HS6-5-2 steel after principal tempering. Moreover, the differences in hardness of samples of the investigated steel in relationship to the heating rate were evaluated. The microstructure development in tested samples, reflecting the extend of the phase transformations during tempering, was discussed too. Design/methodology/approach: Dilatometric investigations were performed using a DT 1000 dilatometer of a French company Adamel. The microstructure of investigations steels were examined by transmission JEM200CX microscope. Due to high brittleness of test steel it was decided to test their strength with static bend test. The tests have been carried out on ø 5 samples using INSTRON testing machine. Evaluation of crack resistance of test steels has been made by means of linear elastic fracture mechanics method on the basis of the measurement of stress intensity factor KIc, in static bend test. Findings: Change of heating rate during tempering has strong influence on the temperatures of beginnings and the ends of individual transitions as well as on the accompanying dilatation effects. It has been stated that, in test steel in which remains a lot of retained austenite after hardening, the pre-tempering within the range of cementite precipitation and transformation of retained austenite, adversely affects the properties after principal tempering. Research limitations/implications: Description of the influence of phase transformation on the mechanical properties of HS6-5-2 high speed steel. Practical implications: It was shown, that advance (by pre-tempering) of selected phase transformations during tempering may affect steel properties after principal tempering. Originality/value: This results should be of interest to engineers concerned with design new technologies of steel tempering.

Słowa kluczowe

PL

narzędzia materiałowe; odpuszczanie; stal szybkotnąca; austenit szczątkowy

EN

tool materials; tempering; high-speed steel; retained austenite

• Wydawca: International OCSCO World Press
• Czasopismo: Journal of Achievements in Materials and Manufacturing Engineering
• Rocznik: 2008
• Tom: Vol. 28, nr 2
• Strony: 123--130
• Opis fizyczny: Bibliogr. 16 poz., wykr.

Twórcy

autor

Bała P.

autor

Pacyna J.

• Faculty of Metals Engineering and Industrial Computer Science, AGH University of Science and Technology, al. Mickiewicza 30, 30-059 Krakow, Poland,

Bibliografia

• [1] A. K. Sinha, Physical metallurgy handbook, The McGraw-Hill Companies, Inc., New York, 2003.
• [2] R. W. K. Honeycombe, H. K. D. H. Bhadeshia, Steels. microstructure and properties, Second Edition. Edward Arnold, London, 1995.
• [3] M. Blicharski, Steels, WNT, Warsaw, 2004 (in Polish).
• [4] L. A. Dobrzański, W. Kasprzak, J. Mazurkiewicz, The structure and properties W-Mo-V-Co high-speed steel of the type 11-2-2-5 after heat treatment, Proceedings of the 4th International Scientific Conference "Achievements in Mechanical and Materials Engineering'' AMME'95, Gliwice-Wisła, 1995, 83-86 (in Polish).
• [5] L. A. Dobrzański, A. Zarychta, The structure and properties of W-Mo-V high-speed steels with increased contents of Si and Nb after heat treatment, Journal of Materials Processing Technology 77 (1998) 180-193.
• [6] F. Pan, M. Hirohashi, Y. Lu, P. Ding, A. Tang, D. V. Edmonds, Carbides in high-speed steels containing silicon, Metallurgical and Materials Transactions 35A (2004) 2757-2766.
• [7] L. A. Dobrzański, M. Ligarski, Role of Ti in the W-Mo-V high-speed steels, Proceedings of the 4th International Scientific Conference "Achievements in Mechanical and Materials Engineering" AMME'95, Gliwice-Wisła, 1995, 87-90.
• [8] M. Wang, Y. Wang, F. Sun, Tempering behavior of a semi-high speed steel containing nitrogen, Materials Science and Engineering A 438-440 (2006) 1139-1142.
• [9] L. Xu, J. Xing, S. Wei, Y. Zhang, R. Long, Study on relative wear resistance and wear stability of high-speed steel with high vanadium content, Wear 262 (2007) 253-261.
• [10] P. Bała, The kinetics of phase transformations during tempering and its influence on the mechanical properties, PhD thesis, AGH University of Science and Technology, Cracow, 2007 (in Polish).
• [11] P. Bała, J. Pacyna, J. Krawczyk, The kinetics of phase transformations during the tempering of HS18-0-1 high-speed steel. Journal of Achievements in Materials and Manufacturing Engineering 19/1 (2006) 19-25.
• [12] P. Bała, J. Pacyna, J. Krawczyk, The kinetics of phase transformations during the tempering of HS6-5-2 high-speed steel, Journal of Achievements in Materials and Manufacturing Engineering 18 (2006) 47-50.
• [13] T. H. Yu, C. Y. Chen, J. R. Yang, Decomposition of retained austenite in a high-speed steel GPM A30, Journal of Materials Engineering and Performance 16 (2007) 102-108.
• [14] L. A. Dobrzański, M. Adamiak, W. Kasprzak, Structure and properties of the heat-treated and PVD coated W-Mo-V-Co high-speed steel of the 9-2-2-5 type, Proceedings of the 7thInternational Scientific Conference "Achievements in Mechanical and Materials Engineering" AMME'98, Gliwice-Zakopane, 1998, 107-110.
• [15] T. Babul, N. Kucharieva, A. Nakonieczny, J. Senatorski, Structure and properties of nitrocarburized diffusion layers generated on high-speed steels, Journal of Materials Engineering and Performance 12 (2003) 696-700.
• [16] P. Bała, J. Pacyna, The kinetics of phase transformations during tempering in high-speed steels, Journal of Achievements in Materials and Manufacturing Engineering 23/2 (2007) 15-18.