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A series of nickel-chromium stainless alloys made by air and vacuum melting were rolled 20 or 40 per cent at temperatures ranging from —320 to 400 F. Smooth and sharp-notched sheet-tensile properties were measured after heat treating the cold-rolled pieces for 24 hr at 800 F. Yield strengths up to 260 ksi were obtained. Hardening resulted primarily from martensite formation, and also from work hardening of the austenite prior to transformation. The yield strengths were correlated in terms of composition.
Lowering the silicon content to 0.1 per cent significantly raised the toughness. Over the ranges studied none of the remaining elements had effects comparable to silicon. The toughness at a given strength level also depended upon the rolling conditions, but not upon the per cent martensite.
Tests at −320 F with a low-silicon alloy showed a notch-tensile ratio of 1.0 at 297 ksi ultimate tensile strength. The results suggest that a low-silicon 301-type composition would have good cryogenic properties.
Supervisor, Iron-Nickel Alloys Section, Research Laboratory, The International Nickel Co., Inc., Bayonne, N.J.
Mihalisin, J. R.
Metal Physics Section, Research Laboratory, The International Nickel Co., Inc., Bayonne, N.J.