STRESS CORROSION OF HIGH STRENGTH STEELS AND ALLOYS; ARTIFICIAL ENVIRONMENT
Monthly scientific progress rept. no. 13 Jul 1961
CARNEGIE-MELLON UNIV PITTSBURGH PA MELLON INST OF SCIENCE
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Stress corrosion tests are being made on high-strength steels and alloys missile case materials under synthetic environments. Polyethylene containers are being used for the exposure of U-bend specimens to solutions of NaCl, NaNO3, Na2SO4, NaPO3, and Na2S. Chemical analysis data are presented for Ladish D6Ac, 300M, Vascojet 100, AM355, PH15-7Mo, B120VCA, 4137Co, Rocoly 270, and Ardeform 301. U-bend stress corrosion tests are progressing on 4137 Co, AM355 115-8Mo. B120VCA, and Ardeform 301. Bent specimens of 4137 Co and AM 355 are still under test. No failures were observed on bent beam specimens of AM355 secondary direction cold-rolled to 250, 261, 302 Kpsi strength levels. Little change was noted in the bent beam specimens of 4137 Co exposed to 3 natural environments marine, semi-industrial, and industrial. Data are presented for U-bend specimens of AM355 primary direction, lowest yield strength. No failures were observed with B120 VCA U-bend specimens secondary direction, 135 Kpsi yield strength. Cumulative data are presented for U-bend specimens of PH15-7 Mo and AM 355 tested in CC14, C5H12, and C2H2C14, in addition to the 5 test solutions. A susceptibility to corrosion in NaCl was indicated for Ardeform 301, and in NaNO3 and NaPO3 for 4137 Co.
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