Mathematical modelling of hardness of quenched and tempered steel

• Autorzy: Smoljan B. , Iljkić D. , Tomašić N.
• Języki publikacji: EN

Abstrakty

EN

Purpose: In this paper a new mathematical model and expressions for prediction of hardness of quenched and tempered steel was established. Design/methodology/approach: Novel mathematical expression for prediction of hardness of quenched and tempered steel was established. This expression includes tempering temperature, hardenability properties and degree of hardening. By experimental work it was found out that results of quenching and tempering are related to hardenability properties of steel. Findings: Based on experimental work it was found out that prediction of hardness of quenched and tempered steel is more precise by novel mathematical expression than by relation according to the German standard DIN 17021, or than by relation established by Just, E. Research limitations/implications: By taking into account the hardenability properties of steels, influence of diffusivity on kinetic of tempering processes is indirectly taken into account in the mathematical modeling of tempering processes without using the chemical composition of steel. Practical implications: The established relations were applied in mathematical modeling and computer simulation of quenching and tempering of shaft made of low alloyed steel. It was found out that hardness of quenched and tempered steel workpieces can be successfully calculated by the proposed method. Originality/value: Hardenability properties of steel are included in the established relation to achieve more precise prediction of quenched and tempered steel hardness. The influence of diffusivity on kinetic of tempering processes is indirectly taken into account in the mathematical modeling of tempering processes without using the chemical composition of steel.

Słowa kluczowe

EN

steel; quenching and tempering; hardness; computer simulation

PL

stal; ulepszanie cieplne; twardość; symulacja komputerowa

• Wydawca: International OCSCO World Press
• Czasopismo: Archives of Materials Science and Engineering
• Rocznik: 2015
• Tom: Vol. 74, nr 2
• Strony: 85--93

Twórcy

autor

Smoljan B.

• Department of Materials Science and Engineering, University of Rijeka - Faculty of Engineering, Vukovarska 58, HR-51000 Rijeka, Croatia

autor

Iljkić D.

• Department of Materials Science and Engineering, University of Rijeka - Faculty of Engineering, Vukovarska 58, HR-51000 Rijeka, Croatia

autor

Tomašić N.

• Department of Materials Science and Engineering, University of Rijeka - Faculty of Engineering, Vukovarska 58, HR-51000 Rijeka, Croatia

Bibliografia

• [1] D.U. Furrer, S.L. Semiatin, Process and Quality Control Considerations, ASM Handbook, Volume 5: Heat Treatment, ASM International, Material Park, OH, 2006.
• [2] B. Smoljan, The calibration of the heat conductivity coefficient in mathematical model of steel quenching, Proceedings of MicroCAD`99, Hungary, 1999.
• [3] B. Smoljan, Numerical simulation of as-quenched hardness in a steel specimen of complex form, Communications in Numerical Methods in Engineering 14, (1998) 277-285.
• [4] S. Patankar, Numerical Heat Transfer and Fluid Flow, McGraw Hill Book Company, New York, 1980.
• [5] A. Rose, F. Wever, Atlas zur Wärmebehandlung der Stähle I, 2, VDI, Düsseldorf, 1954.
• [6] B. Liščič, Steel Heat Treatment, Steel Heat Treatment Handbook, G.E. Totten (Ed.), p 277, Taylor & Francis Group, Boca Raton: CRC Press, 2007.
• [7] E. Just, Vergüten - Werkstoffbeeinflussung durch Harten und Anlassen, VDI-Ber. 256 (1976) 125-140 (in German).
• [8] B. Smoljan, D. Iljkić, G.E. Totten, Mathematical Modeling and Simulation of Hardness of Quenched and Tempered Steel, Metallurgical and Materials Transactions B, 2015.
• [9] D. Iljkić, A contribution to the development of the mechanical properties prediction of quenched and tempered steel and cast steel, Doctoral Thesis, Department of Materials Science and Engineering, Faculty of Engineering, University of Rijeka, 2010. (in Croatian).
• [10] B. Smoljan, D. Iljkić, S. Smokvina Hanza, Journal of Achievements in Materials and Manufacturing Engineering 34/2 (2009) 152-158.
• [11] T. Reti, I. Felde, M. Guerrero, S. Sarmiento, Using Generalized Time-Temperature Parameters for Predicting the Hardness Change Occurring during Tempering, International Conference on New Challenges in Heat Treatment and Surface Engineering (Conference in honour of Prof. B. Smoljan, B. Matijević, Eds., June 9-12, Dubrovnik-Cavtat, Croatia, 2009, 333-342.