SEDL / STP / STP174-EB / STP44984S

Influence of Boron on Cast Cobalt-Base S-816 Alloy

Blatz, W. E.
Research Metallurgist, Supervising Metallurgist, and Associate Director of Research, Allegheny Ludlum Steel Corp., Watervliet, N. Y.

Reynolds, E. E.
Research Metallurgist, Supervising Metallurgist, and Associate Director of Research, Allegheny Ludlum Steel Corp., Watervliet, N. Y.

Dyrkacz, W. W.
Research Metallurgist, Supervising Metallurgist, and Associate Director of Research, Allegheny Ludlum Steel Corp., Watervliet, N. Y.

Pages: 13    Published: Jan 1956

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Abstract

Cast cobalt-base alloys with stress-rupture properties at 1650 F equivalent to those of S-816 alloy at 1500 F were developed in the investigation described. This outstanding strengthening effect resulted from additions of boron, the influence of which was studied extensively. Optimum rupture strengths plus good rupture ductility are obtained with approximately 1 per cent boron. The boron range is wide enough to permit commercial production. These alloys also possess excellent casting characteristics.