Research on the Basic Nature of Stress Corrosion for Various Structural Alloys at Room and Elevated Temperatures
Research on the Basic Nature of Stress Corrosion for Various Structural Alloys at Room and Elevated Temperatures

Author: Frank A. Crossley

Publisher:

Published: 1963

Total Pages: 70

ISBN-13:

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Program objectives were: (1) to study the effect of microstructure on susceptibility to stress corrosion cracking in the short-transverse direction of 7075-T6 aluminum alloy; and (2) to study the kinetics of stress-corrosion cracking at elevated temperature of candidate materials for structural applications in the trisonic transport in the presence of sea salt. It was hypothesized that the poor resistance to stress corrosion of high-strength, wrought aluminum alloys was due to the layered-type microstructure characteristic of these materials. Short life was associated with the layered-type of grain structure characteristic of commercial material, and long life was associated with irregular or equiaxed grain structures. The experimental results gave good support to the hypothesis.

Research on the Basic Nature of Stress Corrosion for Various Structural Alloys at Room and Elevated Temperatures
Research on the Basic Nature of Stress Corrosion for Various Structural Alloys at Room and Elevated Temperatures

Author: Frank A. Crossley

Publisher:

Published: 1964

Total Pages: 0

ISBN-13:

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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.

Research on the Basic Nature of Stress Corrosion for Various Structural Alloys at Room and Elevated Temperatures
Research on the Basic Nature of Stress Corrosion for Various Structural Alloys at Room and Elevated Temperatures

Author: Frank A. Crossley

Publisher:

Published: 1963

Total Pages: 49

ISBN-13:

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Program objectives were: (1) to study the effect of microstructure on susceptibility to stress corrosion cracking in the short-transverse direction of 7075-T6 aluminum alloy; and (2) to study the kinetics of stress-corrosion cracking at elevated temperature of candidate materials for structural applications in the trisonic transport in the presence of sea salt. It was hypothesized that the poor resistance to stress corrosion of high-strength, wrought aluminum alloys was due to the layered-type microstructure characteristic of these materials. Short life was associated with the layered-type of grain structure characteristic of commercial material, and long life was associated with irregular or equiaxed grain structures. The experimental results gave good support to the hypothesis.

Research on the Basic Nature of Stress Corrosion for Various Structural Alloys at Room and Elevated Temperature
Research on the Basic Nature of Stress Corrosion for Various Structural Alloys at Room and Elevated Temperature

Author: Frank A. Corssley

Publisher:

Published: 1962

Total Pages: 61

ISBN-13:

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The relationship between quantity of ASTM sea salt, varying from 0.0002 to 0.02 g/sq in., and thickness of anodized film--0, 2, and 8 microinches--in elevated temperature stress-corrosion cracking of the titanium alloys Ti-6A1-4V and B120VCA was investigated. Exposure conditions were 800 degree F-25,000 psi- 190 hr for the former alloy and 600 degrees F-100,000 p i-190 hr for the latter. Damage was progressively greater with increasing quantity of salt. The anodized films appeared to be of benefit only to the B-120VCA. The alloys: 2024-T86, 7075- T6, ZK-60A-T5, 17-7 PH RH950, and B-120VCA in two conditions of grain size and two conditions of surface treatment were tested as follows: tensile test in air at room temperature, and in distilled water an ASTM sea water at 32 degrees, 75 degrees, and 212 degrees F; and statically leaded at 90% of the yield strength in media of air, water, and ASTM sea water at room temperature.

Research on the Basic Nature of Stress Corrosion for Various Structural Alloys at Room and Elevated Temperature
Research on the Basic Nature of Stress Corrosion for Various Structural Alloys at Room and Elevated Temperature

Author: AERONAUTICAL SYSTEMS DIV WRIGHT-PATTERSON AFB OH.

Publisher:

Published: 1962

Total Pages: 74

ISBN-13:

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The relationship between quantity of ASTM sea salt, varying from 0.0002 to 0.02 g/sq in., and thickness of anodized film--0, 2, and 8 microinches--in elevated temperature stress-corrosion cracking of the titanium alloys Ti-6A1-4V and B120VCA was investigated. Exposure conditions were 800 degree F-25,000 psi- 190 hr for the former alloy and 600 degrees F-100,000 p i-190 hr for the latter. Damage was progressively greater with increasing quantity of salt. The anodized films appeared to be of benefit only to the B-120VCA. The alloys: 2024-T86, 7075- T6, ZK-60A-T5, 17-7 PH RH950, and B-120VCA in two conditions of grain size and two conditions of surface treatment were tested as follows: tensile test in air at room temperature, and in distilled water an ASTM sea water at 32 degrees, 75 degrees, and 212 degrees F; and statically leaded at 90% of the yield strength in media of air, water, and ASTM sea water at room temperature.

A Review of the Air Force Materials Research and Development Program
A Review of the Air Force Materials Research and Development Program

Author: Air Force Materials Laboratory (U.S.)

Publisher:

Published: 1964

Total Pages: 294

ISBN-13:

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Technical reports published by the Air Force Materials Laboratoy during the period 1 July 1962 - 30 June 1963 are abstracted herein. Reports on reseqrch conducted by the Air Force Materials Laboratory personnel as well as that conducted on contract are included. These reports cover basic and applied research in the materials area being conducted by the Metals and Ceramics Division, Non-metallic Materials Division, Materials Physics Division, Manufacturing Technology Division, and Materials Applications Division of the Air Force Materials Laboratory.