Czasopismo
2008
|
Vol. 8, iss. 3
|
69-74
Tytuł artykułu
Autorzy
Wybrane pełne teksty z tego czasopisma
Warianty tytułu
Języki publikacji
Abstrakty
The investigation was carried out to examine the influence of temperature and times of austempering process on the maximum extend to which the ausferritic reaction can proceed and the carbon content in retained austenite. Specimens prepared from ductile cast iron were austenitised at 950°C for 60 minutes and austempered at four temperatures: 250, 300, 350 and 400°C. The samples were austempered at these temperatures for 15, 30, 60, 120 and 240 minutes and finally quenched to ambient temperature. Volume fractions of retained austenite and carbon concentration in the residual austenite have been observed by using X-ray diffraction. Additionally, carbon concentration in the residual austenite was calculated using volume fraction data of austenite and a model developed by Bhadeshia based on the McLellan and Dunn quasi-chemical thermodynamic model. It was found that the obtained extend of ausferritic transformation is only possible when the microstructure consists of not only ausferrite but additionally precipitated carbides.
Czasopismo
Rocznik
Tom
Strony
69-74
Opis fizyczny
Bibliogr. 18 poz., rys., tab., wykr.
Twórcy
autor
autor
- Department of Materials Science and Engineering, Mechanical Engineering Faculty, University of Technology and Life Sciences, 85-796 Bydgoszcz, av. Kaliskiego 7, Poland, lawry@utp.edu.pl
Bibliografia
- [1]. Pietrowski S.: Nodular cast iron of bainitic ferrite structure with austenite or bainitic structure. Archives of Materials Science 18 (1997), pp. 253-273 (in Polish).
- [2]. Ławrynowicz Z., Dymski S.: Analysis of carbon diffusion during bainite transformation in ADI, Archives of Foundry Engineering, 7 (2007) pp. 87-92.
- [3]. Ławrynowicz Z., Dymski S.: Mechanism of bainite transformation in ductile iron ADI. Archives of Foundry Engineering 6 (2006), pp. 171-176 (in Polish).
- [4]. Takahashi M., Bhadeshia H.K.D.H.: A Model for the Microstructure of Some Advanced Bainitic Steels, Materials Transaction, JIM, 32 (1991) pp. 689-696.
- [5]. J.W. Christian J. W., Theory of transformations in metals and alloys, 778, Oxford, Pergamon Press, 1965.
- [6]. Bhadeshia H.K.D.H., Bainite in Steels, Institute of Materials, 1-458, London, 1992.
- [7]. Ławrynowicz Z.: Transition from upper to lower bainite in Fe-Cr-C steel. Materials Science and Technology. 20 (2004) pp. 1447-1454.
- [8]. Ławrynowicz Z.: A discussion on the mechanism of bainite transformation in steels. Technology and Materials, Gdańsk, Politechnika Gdańska, 4, (2006), pp. 149-155 (in Polish).
- [9]. Ławrynowicz Z.: Mechanism of bainite transformation in Fe-Cr-Mo-V-Ti-C steel. International Journal of Engineering, 12 (1999) pp. 81-86.
- [10]. Bhadeshia H.K.D.H., Christian J.W.: Bainite in Steels. Metallurgical Transactions A 21A (1990), pp. 767-797.
- [11]. Ławrynowicz Z.: Criticism of selected methods for diffusivity estimation of carbon in austenite. Zeszyty Naukowe ATR nr 216, Mechanika 43, (1998), pp. 283-287 (in Polish).
- [12]. Bhadeshia H.K.D.H.: Diffusion of carbon in austenite. Metal Science 15 (1981), pp. 477-479.
- [13]. Siller R.H., McLelan R.B.: The Application of First Order Mixing Statistics to the Variation of the Diffusivity of Carbon in Austenite. Metallurgical Transactions 1 (1970), pp. 985-988.
- [14]. Ławrynowicz Z.: Bainitic transformation: estimation of carbon diffusivity in austenite on the basis of measured austenite film thickness. Zeszyty Naukowe ATR nr 216, Mechanika 43, (1998), 289-297 (in Polish).
- [15]. Ławrynowicz Z., Dymski S.: Application of the mechanism of bainite transformation to modelling of processing window in ductile iron ADI. Archives of Foundry Engineering 6 (2006), pp. 177-182.
- [16]. Ławrynowicz Z.:Carbon partitioning during bainite transformations in low alloy steels. Materials Science and Technollogy 18 (2002) pp. 1322-1324.
- [17]. Ławrynowicz Z., Barbacki A., Analiza mechanizmu izotermicznej przemiany bainitycznej w stali Cr-Mn-Si. Archiwum Nauki o Materiałach 17 (1996) pp. 127-147.
- [18]. Ławrynowicz Z., Dymski S.: Carbon concentration of austenite in austempered ductile iron (ADI), Archives of Foundry Engineering, 7 (2007) pp. 93-99.
Typ dokumentu
Bibliografia
Identyfikatory
Identyfikator YADDA
bwmeta1.element.baztech-article-BPZ3-0035-0013