Measurement of Phase Transformation Kinetics in Austempered Ductile Iron

• Autorzy: Tyrała E. , Górny M. , Kawalec M.
• Języki publikacji: EN

Abstrakty

EN

The kinetics reaction occurring during the austempering treatment of ductile iron containing different concentration of Cu and Ni was studied. The samples were subjected to heat treatment in dilatometry equipment. In addition to that Vickers hardness measurements and metallographic investigations were performed. The exponential equation was used to describe the isothermal transformation processes. The dilatometric studies indicate that the addition of copper in contrast to the addition of copper and nickel does not significantly affect incubation time of austempering transformation. It has been shown that austermpering process is characterized by different transformation rate. In the initial range the addition of copper, and even in a greater extent both copper and nickel reduces its rate and moves the maximum value of the right. Results of this study also indicate that the initial growth of plates of ferrite occurs mainly diffusionlessly and the resulting maximum on the transformation rate curve should be identified with the time after which predominantly ferrite plates growth by diffusion.

Słowa kluczowe

EN

austempered ductile iron; phase transformation; dilatometry

PL

żeliwo sferoidalne ausferrytyczne; przemiana fazowa; dylatometria

• Wydawca: Komisja Odlewnictwa Polskiej Akademii Nauk Oddział w Katowicach
• Czasopismo: Archives of Foundry Engineering
• Rocznik: 2013
• Tom: Vol. 13, iss. 3 spec.
• Strony: 175--178
• Opis fizyczny: Bibliogr. 4 poz., rys., tab., wykr.

Twórcy

autor

Tyrała E.

• AGH University of Science and Technology, Faculty of Foundry Engineering, Department of Engineering of Cast Alloys and Composites, Reymonta 23, 30-059 Kraków, Poland

autor

Górny M.

• AGH University of Science and Technology, Faculty of Foundry Engineering, Department of Engineering of Cast Alloys and Composites, Reymonta 23, 30-059 Kraków, Poland

autor

Kawalec M.

• AGH University of Science and Technology, Faculty of Foundry Engineering, Department of Engineering of Cast Alloys and Composites, Reymonta 23, 30-059 Kraków, Poland

Bibliografia

• [1] Cisneros-Guerrero M.M., Campos-Cambranis R.E., Castro-Román M., Pérez-López M.J. (1997). Austempering Kinetics in Cu-Mo Alloyed Ductile Iron: A Dilatometric Study. Advanced Materials Research, 4-5, 415-420.
• [2] Fraś E., Górny M., Tyrała E., Lopez H.F. (2012). Effect of nodule count on austenitizing and austempering kinetics of ductile iron castings and mechanical properties of thin-walled iron castings. Materials Science and Technology, 28(12), 1391-1396.
• [3] Ahmadabadi M.N., Farjami S. (2003). Transformation kinetics of unalloyed and high Mn austempered ductile iron. Materials Science and Technology, 19, 645-649.
• [4] Leijten M.C., Nieswaag H., Katgerman L. (1997). The Isothermal Transformation of Ductile Cast Iron. Advanced Materials Research, 4-5, 385-390.