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Influence of nickel alloy composition and method of melting on their structure and properties were studies. Melting was performed in argon and under a layer of flux. It is established that argon-arc melting of nickel alloys with high manganese content allows producing ingots of a more stable composition than in submerged-arc melting. It is noted that alloys of the considered system are prone to porosity. Increase of pouring temperature promotes reduction of porosity in ingots. Structure of ingots with different manganese content in as-cast condition, after annealing and rolling was studied. It was shown that at manganese content in the alloys of up to 25 wt.%, it is possible to produce ingots of a higher strength and ductility, which lend themselves easily to forming. After rolling the alloys have the structure of fine-grained solid solution. Strength of such a metal reaches 900—950 MPa at relative elongation of about 40 %. At greater manganese content the alloys become brittle as a result of formation of intermetallic phases in them. 8 Ref., 3 Tables, 7 Figures.

Features of melting, structure and properties of Ni—Mn—Cu system nickel alloys