Accession Number:

AD0605703

Title:

RESEARCH ON THE BASIC NATURE OF STRESS CORROSION FOR VARIOUS STRUCTURAL ALLOYS AT ROOM AND ELEVATED TEMPERATURE,

Descriptive Note:

Corporate Author:

IIT RESEARCH INST CHICAGO ILL

Personal Author(s):

Report Date:

1964-05-01

Pagination or Media Count:

64.0

Abstract:

Wrought, high-strength aluminum alloys characteristically have markedly inferior resistance to stress corrosion in the short-transverse direction relative to resistance in the longitudinal and long-transverse directions. The anisotropy of resistance has been shown to be due to marked anisotropy of microstructure. Investigation of experimental and commercial 1 in. plate showed that the elongated, plate-like grain structure usually found in commercial materials was associated with short life while equiaxed or irregular grain structure was associated with significantly longer life. Excess alloy content resulting in second-phase particles in the microstructure contributes to the development of the undesirable elongated grain structure. Exposure at 650F under stress for times of 1400 or 2000 hr gave no indication that the steels PH 13-8 Mo and PH 14-8 Mo are susceptible to hot salt stress corrosion. Experiments to determine the kinetics of hot salt stress-corrosion cracking of Ti-8Al-1Mo-1V alloys are described. Cracking was observed at 500F, 50F lower than the lower temperature limit reported in prior investigations. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE