Metalurgija, Vol. 53 No. 3, 2014.
Prethodno priopćenje
Thermodynamic stability of austenitic Ni-Mn-Cu cast iron
A. Janus
; Wroclaw University of Technology, Department of Foundry Engi-neering and Automation, Wrocław, Poland
M. Stachowicz
; Wroclaw University of Technology, Department of Foundry Engi-neering and Automation, Wrocław, Poland
Sažetak
The performed research was aimed at determining thermodynamic stability of structures of Ni-Mn-Cu cast iron castings. Examined were 35 alloys. The castings were tempered at 900 °C for 2 hours. Two cooling speeds were used: furnace-cooling and water-cooling. In the alloys with the nickel equivalent value less than 20,0 %, partial transition of austenite to martensite took place. The austenite decomposition ratio and the related growth of hardness was higher for smaller nickel equivalent value and was clearly larger in annealed castings than in hardened ones. Obtaining thermodynamically stable structure of castings requires larger than 20,0 % value of the nickel equivalent.
Ključne riječi
austenitic cast iron; heat treatment; structure martensitic transition; cooling, nickel equivalent
Hrčak ID:
119550
URI
Datum izdavanja:
1.7.2014.
Posjeta: 1.238 *