Surface Hardening of Nodular Cast Iron by GTAW Remelting

• Autorzy: Orłowicz A. W. , Trytek A. , Korzeniowski M. , Kupiec B.

Identyfikatory

DOI

10.24425/123601

• Języki publikacji: EN

Abstrakty

EN

The study reported in this paper was aimed at establishing the effect of values of parameters characterizing the process of superficial remelting of a nodular iron casting on the quantity of introduced heat, geometry of remeltings as well as parameter λ and hardness of cementite eutectic. The remelting process was carried out using GTAW method, at electric arc length of 3 mm in argon atmosphere, welding current intensities I = 50, 130, 210, and 300 A, and electric arc scanning speeds vs = 200, 400, and 800 mm/min. The measurements included estimation of the quantity of heat introduced to the casting in the electric arc-induced remelting process with the use of flow calorimeter. Widths and depths of remetlings were assessed with the use of metallographic method. As a result of fast solidification, cementite eutectic was obtained in remelted material in which, in the course of cooling down to ambient temperature, austenite was subject to partial transformation into martensite. To characterize the cementite eutectic, value of the structural parameter λ was assessed. Values of the parameter were similar for areas of occurrence of both fibrous and laminated eutectic. Remeltings were examined at half of their depths. Micro-hardness measurements were taken in the same areas. The established quantitative relationships may prove to be useful in practice for the purpose of predicting values of parameter λ and hardness of remeltings in studies aimed at improving resistance of cast-iron castings to abrasive wear.

Słowa kluczowe

EN

solidification process; mechanical properties; nodular cast iron; GTAW process; surface layer

PL

proces krzepnięcia; właściwości mechaniczne; żeliwo sferoidalne; proces GTAW; warstwa powierzchniowa

• Wydawca: Komisja Odlewnictwa Polskiej Akademii Nauk Oddział w Katowicach
• Czasopismo: Archives of Foundry Engineering
• Rocznik: 2018
• Tom: Vol. 18, iss. 3
• Strony: 53--58
• Opis fizyczny: Bibliogr. 10 poz., rys., tab., wykr.

Twórcy

autor

Orłowicz A. W.

• Rzeszow University of Technology, Rzeszów, Poland

autor

Trytek A.

• Rzeszow University of Technology, Rzeszów, Poland

autor

Korzeniowski M.

• Rzeszow University of Technology, Rzeszów, Poland

autor

Kupiec B.

• Rzeszow University of Technology, Rzeszów, Poland

Bibliografia

• [1] Podrzucki, Cz. (1991). Cast iron — structure, properties, application. Vol. I and II. Kraków: Wyd. ZG STOP. (in Polish).
• [2] Fraś, E. (1992). Crystallization of metals and alloys. (Krystalizacja metali i stopów). Warszawa: PWN. (in Polish).
• [3] Girzon, W.W. & Anpilogov, D.J. (1997). Thermal treatment with the use of highly concentrated energy sources. Metalovedenie i Termicheskaya Obrabotka. 4, 11-13. (in Russian).
• [4] Guzik, E. (1994). A model of growth of irregular eutectic on example of graphite eutectic in Fe-C alloys. Rozprawy Monograficzne 15. Kraków: AGH. (in Polish).
• [5] Jackson, K.A., Hunt, J.D. (1966). Lamelar and rool eutectic growth. Transaction Metal. Soc. AIME236, II29- II41.
• [6] James, H. & Kurz, W. (1981). Relation of interphase spacing and growth temperature to growth velocity in Fe-C and Fe-Fe3C eutectic alloy. Zeitschrift fur Metallkunde. H11, 792-797.
• [7] Shamanin, M.W. (1958). Some issues concerning bead metal crystallization in electric arc welding. Svarka. Sudpromgaz. (in Russian).
• [8] Orłowicz, A. & Trytek, A. (2003). Effect of rapid solidification on sliding wear of iron castings. Wear. 254, 154-163.
• [9] Orłowicz, A.W., Mróz, M., Trytek, A., Tupaj, M., Betlej, J. (2011). Polish Patent No. 211283, Flow calorimeter for thermal measurements in welding processes. Warsaw: Polish Patent Office. (in Polish).
• [10] Du Pont, J.N., Marder, A.R. (1995). Thermal efficiency of arc welding processes. Welding Research Supplement, December 1995, 406-416.

Uwagi

PL

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2018).