Effect of Heat-treatment Parameters of Cast Iron GJS-X350NiMnCu7-3-2 on its Structure and Mechanical Properties

• Autorzy: Medyński D. , Janus A. , Zaborski S.

Identyfikatory

DOI

10.1515/afe-2017-0022

• Języki publikacji: EN

Abstrakty

EN

The paper presents influence of soaking parameters (temperature and time) on structure and mechanical properties of spheroidal graphite nickel-manganese-copper cast iron, containing: 7.2% Ni, 2.6% Mn and 2.4% Cu. Raw castings showed austenitic structure and relatively low hardness (150 HBW) guaranteeing their good machinability. Heat treatment consisted in soaking the castings within 400 to 600°C for 2 to 10 hours followed by air-cooling. In most cases, soaking caused changes in structure and, in consequence, an increase of hardness in comparison to raw castings. The highest hardness and tensile strength was obtained after soaking at 550°C for 6 hours. At the same time, decrease of the parameters related to plasticity of cast iron (elongation and impact strength) was observed. This resulted from the fact that, in these conditions, the largest fraction of fine-acicular ferrite with relatively high hardness (490 HV0.1) was created in the matrix. At lower temperatures and after shorter soaking times, hardness and tensile strength were lower because of smaller degree of austenite transformation. At higher temperatures and after longer soaking times, fine-dispersive ferrite was produced. That resulted in slightly lower material hardness.

Słowa kluczowe

EN

mechanical properties; heat treatment; austenitic transformation; austenitic cast iron; cast iron Ni-Mn-Cu

PL

właściwości mechaniczne; obróbka cieplna; transformacja austenityczna; żeliwo austenityczne; żeliwo Ni-Mn-Cu

• Wydawca: Komisja Odlewnictwa Polskiej Akademii Nauk Oddział w Katowicach
• Czasopismo: Archives of Foundry Engineering
• Rocznik: 2017
• Tom: Vol. 17, iss. 1
• Strony: 121--126
• Opis fizyczny: Bibliogr. 12 poz., il., tab., wykr.

Twórcy

autor

Medyński D.

• Witelon State University of Applied Science in Legnica, Department of Technical and Economic Sciences, Sejmowa 5A, 59-220 Legnica, Poland

autor

Janus A.

• Wroclaw University of Technology, Mechanical Faculty, Department of Foundry Engineering, Plastics and Automation, Smoluchowskiego 25, 50-372 Wrocław, Poland

autor

Zaborski S.

• Witelon State University of Applied Science in Legnica, Department of Technical and Economic Sciences, Sejmowa 5A, 59-220 Legnica, Poland

Bibliografia

• [1] Guzik, E. & Kopyciński, D. (2006). Austenitic ductile iron. Transactions of the VSB - Technical University of Ostrava. 1, 51-56.
• [2] Janus, A., Granat, K. (2005). Abrasion resistant austenitic-bainitic cast iron. Report of Institute of Machine Engineering and Automation of Wroclaw University of Technology, SPR 28 (in Polish).
• [3] Putyra, P., Zarębski, K. & Tabor, A. (2006). Effect of nickel on strength properties of nodular austenitic cast iron. Archives of Foundry. 6(18), 71-76 (in Polish).
• [4] Fatahalla, N., Abu El Ezzb, A. & Semeidab, M. (2009). C, Si and nickel alloying elements to vary carbon equivalent of austenitic ductile cast iron. Microstructure and mechanical properties. Material Science and Engineering. 504, 81-89.
• [5] Cheng-Hsun, H. & Ming-Li, C. (2010). Corrosion behavior of nickel alloyed and austempered ductile iron in 3,5% sodium chloride. Corrosion Science. 52, 2945-2949.
• [6] Ahmabadabi, M.N. & Shamloo, R. (2001). Control of austenitic transformations in ductile iron aided by calculation of Fe-C-Si-X phase boundaries, Journal of Phase Equilibria. 22(3), 1994-1998.
• [7] Seyedi, S. & Rikhtegar, R. (1994). Reducing the nickel content by using manganese in austenitic ductile iron. Journal of Iranian Foundryment’s Society. 14(4), 122-136.
• [8] Pieprznik, S. (1970). Heat treatment of castings. Czestochowa: Cathedral Technology Foundry of Czestochowa University of Technology (in Polish).
• [9] Janus, A. & Kurzawa, A. (2013). Effect of nickel equivalent on austenite transition ratio in Ni-Mn-Cu cast iron. Archives of Foundry Engineering. 13(2), 53-58.
• [10] Medyński, D. & Janus, A. (2015). Effect of nickel equivalent on structure and corrosion resistance of nodular cast iron Ni-Mn-Cu. Archives of Foundry Engineering. 15(1), 69-74.
• [11] Szpunar, E. (1995). The influence of copper on the structure of the austenitic ductil iron Ni-Mn-Cu. Report of Institute of Precise Mechanics. 1, 12-25 (in Polish).
• [12] Guzik, E. (2006). Selected issues forming structure and properties ausferritic cast iron. Archives of Foundry, 6(21), 33-42 (in Polish).

Uwagi

PL

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