Identification of the BCC-Phases in the Structure of Fe-Cr-Ni Alloys Subjected to Arc-Melting and Melt-Spinning
B. Kucharska, J. Kowalczyk
Faculty of Production Engineering and Materials Technology, Czestochowa University of Technology, Częstochowa, Poland
Received: April 30, 2019; revised version November 18, 2019; in final form January 10, 2020
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The paper presents tests on three Fe-Cr-Ni alloys belonging to the group of austenitic chromium-nickel steels (AISI 304L, 316L, and 310S). They were remelted in an arc in the atmosphere of argon, and cast on a rotating at 4000 rpm copper drum cooled with water. Using the XRD method, the authors demonstrated the influence of cooling rate and mutual relation of concentrations of Cr and Ni alloy additives on the martensitic type of phase formed in steels. It was shown that ferrite δ is formed in arc-melted 304L and 316L steels. In the 310S steel, which contains more Cr and Ni but exhibits a lower Cr/Ni = 1.3 ratio than in the 304L and 316L steels, after melting in the arc, martensite ε is formed. As a result of melt-spinning, martensite ε is formed in all three steels. However, the greatest amount of martensite occurs in the 310S steel, while in the 316L steel with the highest Cr/Ni ratio (2.2), it is the smallest.

DOI:10.12693/APhysPolA.137.300
topics: arc-melting, melt-spinning, Fe-Cr-Ni alloys, stainless steels