The influence of austenitization on grain size and mechanical properties of regenerative G21CrMoV4-6 cast steel

• Autorzy: Golański G. , Kupczyk J.
• Języki publikacji: EN

Abstrakty

EN

Purpose: Influence of austenitiziation parameters (temperature and time) on grain size and mechanical properties of low alloy cast steel have been investigated. Design/methodology/approach: The grain size of former austenite was determined by Image Pro Plus software and its distribution by STATISTICA software. The fractography was characterized using TEM. Moreover, mechanical properties (impact energy and hardness) have been measured. Findings: What has been evaluated is the optimum range of austenitization temperatures making it possible to obtain fine austenite grain in the Cr-Mo-V cast steel. Received mechanical properties (after various austenitization parameters) revealed an advantage of tempered bainitic - ferritic structure over the ferritic - pearlitic one (after full- and under-annealing). Practical implications: The established heat treatment parameters can be useful for preparation of regenerative heat treatment technology of Cr-Mo-V casts steels. Originality/value: The relationship between the austenitization parameters, grain size and mechanical properties in G21CrMoV4-6 cast steel was specified.

Słowa kluczowe

EN

metallic alloys; mechanical properties; quantitative metallography

PL

stopy metaliczne; właściwości mechaniczne; metalografia ilościowa

• Wydawca: International OCSCO World Press
• Czasopismo: Archives of Materials Science and Engineering
• Rocznik: 2008
• Tom: Vol. 33, nr 1
• Strony: 29--34
• Opis fizyczny: Bibliogr. 17 poz.

Twórcy

autor

Golański G.

autor

Kupczyk J.

• Institute of Materials Engineering, Czestochowa University of Technology, Al. Armii Krajowej 19, 42–200 Częstochowa, Poland,

Bibliografia

• [1] A. Zielinski, J. Dobrzański, H. Krztoń, Structural changes in low alloy cast steel Cr – Mo – V after long time creep service, Journal of Achievements in Materials and Manufacturing Engineering 25/1 (2007) 33-36.
• [2] D. Renowicz, A. Hernas, M. Cieśla, K. Mutwil, Degradation of the cast steel parts working in power plant pipelines, Journal of Achievements in Materials and Manufracturing Engineering 18 (2006) 219-222.
• [3] J. Okrajni, K. Mutwil, M. Cieśla, Chemical pipelines material fatigue, Proceedings of 13th International Scientific Conference on “Achievements in Mechanical and Mechanical Properties” AMMP’2005, 497-502.
• [4] S. Stachura, The changes of structure and mechanical properties of steels and cast steels after log term serviced at elevated temperatures, Energetic 2 (1999) 109-115 (in Polish).
• [5] J. Trzeszczyński , E. Grzesiczek, W. Brunne , Effectiveness of solutions extending operation time of long operated cast steel elements of steam turbines and steam pipelines, Power Industry 3 (2006) 179-184 (in Polish).
• [6] A. Rehmus–Forc, Change of structure after revitalizatrion cylinders of a steam turbine, Materials Science and Engineering 3 (2006) 265-267 (in Polish).
• [7] S. Stachura, J. Trzeszczyński, The choice of the regenerative thermal treatment of Cr-Mo and Cr–Mo–V cast steel castings, Materials Science and Engineering 6 (1997) 227-233 (in Polish).
• [8] G. Golanski, S. Stachura, J. Kupczyk, A. Zyska, B. Gajda, Non–standard regenerative heat treatment of Cr–Mo–V cast steel after long–term operation, Archives of Foundry 6/22 (2006) 209-215 (in Polish).
• [9] S. Stachura, G Golanski, Report BZ – 202 – 1/01 researches unpublished.
• [10] S. Stachura, J. Kupczyk, M. Gucwa, Optimization of structure and properties of Cr – Mo and Cr – Mo – V cast steel intended for use at increased temperature, Archives of Foundry 54/5 (2004) 402-408.
• [11] Polish Standard PN – 68/H - 04500
• [12] J. Chrapoński, The estimation of usefulness stereological method using to description grain size of the policrystalical materials, Stereologigal Rewiev 1 (1998) 3-14 (in Polish).
• [13] H. Modin, S. Modin, Metallurgical microscopy, London Sutterworths, 1973.
• [14] J. Ryś, Stereological materials, Fotobit–Design, Cracow, 1995 (in Polish).
• [15] G. Golański, S. Stachura, J. Kupczyk, B. Gajda-Kucharska, Heat treatment of cast steel using normalization and intercritical annealing, Archives of Foundry Engineering 7/1 (2007) 123-126.
• [16] G. Golański, S. Stachura, B. Gajda–Kucharska, J. Kupczyk, Optimisation of regenerative heat treatment parameters of G21CrMoV4 - 6 cast steel, Archives of Materials Science Engineering 28/6 (2007) 341-344.
• [17] G. Golański, J. Kupczyk, S. Stachura, B. Gajda, Regenerative heat treatment of Cr – Mo – V cast steel after long term serviced, Materials Science and Engineering 3 (2006) 147-150 (in Polish).