Effect of Cr, Mo and Al on Structure and Selected Mechanical Properties of Austenitic Cast Iron

• Autorzy: Medyński D. , Janus A.

Identyfikatory

DOI

10.24425/afe.2019.129627

• Języki publikacji: EN

Abstrakty

EN

Results of a research on influence of chromium, molybdenum and aluminium on structure and selected mechanical properties of Ni-Mn- Cu cast iron in the as-cast and heat-treated conditions are presented. All raw castings showed austenitic matrix with relatively low hardness, making the material machinable. Additions of chromium and molybdenum resulted in higher inclination to hard spots. However, a small addition of aluminium slightly limited this tendency. Heat treatment consisting in soaking the castings at 500 °C for 4 h resulted in partial transformation of austenite to acicular, carbon-supersaturated ferrite, similar to the bainitic ferrite. A degree of this transformation depended not only on the nickel equivalent value (its lower value resulted in higher transformation degree), but also on concentrations of Cr and Mo (transformation degree increased with increasing total concentration of both elements). The castings with the highest hard spots degree showed the highest hardness, while hardness increase, caused by heat treatment, was the largest in the castings with the highest austenite transformation degree. Addition of Cr and Mo resulted in lower thermodynamic stability of austenite, so it appeared a favourable solution. For this reason, the castings containing the highest total amount of Cr and Mo with an addition of 0.4% Al (to reduce hard spots tendency) showed the highest tensile strength.

Słowa kluczowe

EN

austenitic cast iron; austenite transformation; heat treatment; cast; mechanical properties of cast; nickel equivalent

PL

żeliwo austenityczne; zmiana właściwości; obróbka cieplna; odlew; właściwości mechaniczne odlewu

• Wydawca: Komisja Odlewnictwa Polskiej Akademii Nauk Oddział w Katowicach
• Czasopismo: Archives of Foundry Engineering
• Rocznik: 2019
• Tom: iss. 4
• Strony: 39--44
• Opis fizyczny: Bibliogr. 18 poz., rys., tab.

Twórcy

autor

Medyński D.

• Faculty of Technical and Economic Sciences, Witelon State University of Applied Science in Legnica, Legnica, Poland

autor

Janus A.

• Department of Foundry Engineering, Plastics and Automation, Wroclaw University of Science and Technology, Wroclaw, Poland

Bibliografia

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Uwagi

PL

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2019)