Using the Principles of Image Analysis in the Assessment of the Proportion of Retained Austenite in the Case Hardened Layers

• Autorzy: Váňová P. , Sojka J. , Kulová T. , Jokešová K. , Purtátor P. , Spinu A.

Identyfikatory

DOI

10.1515/amm-2017-0085

• Języki publikacji: EN

Abstrakty

EN

Structures of carburized layers after the surface saturation process in gaseous, liquid or solid medium and after subsequent heat treatment (hardening and low-temperature tempering) consist mainly of high carbon plate martensite with a certain portion of retained austenite. The presence of retained austenite (RA) in carburized layers is mostly considered as undesirable because it decreases hardness of the hardened layer and furthermore, a spontaneous conversion to a ferritic-carbide mixture of a bainitic type, accompanied by a change of properties, dimensional instability and the local increase in internal stress with the possible formation of cracks, can occur. The proportion of retained austenite is, therefore, a significant characteristics of the quality of hardened layers. This work deals with the evaluation of the volume fraction of retained austenite in carburized layers using image analysis on metallographic images.

Słowa kluczowe

EN

retained austenite; carburized layers; image analysis

• Wydawca: Institute of Metallurgy and Materials Science of Polish Academy of Sciences ; Committee of Materials Engineering and Metallurgy of Polish Academy of Sciences
• Czasopismo: Archives of Metallurgy and Materials
• Rocznik: 2017
• Tom: Vol. 62, iss. 2A
• Strony: 577--580
• Opis fizyczny: Bibliogr. 9 poz., rys., tab.

Twórcy

autor

Váňová P.

• VŠB – Technical University of Ostrava, 17. Listopadu 15/2172, 708 33 Ostrava – Poruba, Czech Republic

autor

Sojka J.

• VŠB – Technical University of Ostrava, 17. Listopadu 15/2172, 708 33 Ostrava – Poruba, Czech Republic

autor

Kulová T.

• VŠB – Technical University of Ostrava, 17. Listopadu 15/2172, 708 33 Ostrava – Poruba, Czech Republic

autor

Jokešová K.

• VŠB – Technical University of Ostrava, 17. Listopadu 15/2172, 708 33 Ostrava – Poruba, Czech Republic

autor

Purtátor P.

• VŠB – Technical University of Ostrava, 17. Listopadu 15/2172, 708 33 Ostrava – Poruba, Czech Republic

autor

Spinu A.

• VŠB – Technical University of Ostrava, 17. Listopadu 15/2172, 708 33 Ostrava – Poruba, Czech Republic

Bibliografia

• [1] G. Krauss, Steels: heat treatment and processing principles, 1990 ASM International.
• [2] K.E. Thelning, Steel and his treatment, 1984 Butterworths, London.
• [3] L. Wojnar, Image analysis Application in Materials Engineering, 1999 CRC Press, New York.
• [4] H. Ma. The Quantitative Assessment of Retained Austenite in Induction Hardened Ductile Iron [online]. Electronic Theses and Dissertations, University of Windsor, 2012. http://scholar.uwindsor.ca/cgi/viewcontent.cgi?article=1196&context=etd
• [5] S.H. Magner, R J. De Angelis, W.N. Weins, J. D. Makinson, JCPDS-International Centre for Diffraction Data 2002, Advances in X-ray Analysis. 45, 92-97 (2002).
• [6] Y. Y. Su, L.H. Chiu, T.L. Chuang, C.L. Huang, C.Y. Wu, K.C. Liao, Adv. Mat. Res. 482, 1165-1168 (2012).
• [7] F. L. Sicupira, M. J. R. Sandim, H. R. Z. Sandim, D B. Santos, R.A. Renzetti, Mater. Charact. 115, 90-96 (2016).
• [8] L. Ryde, Mater. Sci. Tech. 22, 1297-1306 (2006).
• [9] P. Váňová, J. Sojka, A. Volodarskaja, K. Jokešová, P. Purtátor, A. Spinu, in: Metal 2016, Tanger Ltd. Ostrava 2016.

Uwagi

PL

Opracowanie ze środków MNiSW w ramach umowy 812/P-DUN/2016 na działalność upowszechniającą naukę (zadania 2017).