The goal of the Contrails project is to help preserve and disseminate the technical record of 20th century aerospace research, highlighting in particular the research endeavors of the Illinois Tech community.

Corrosion Cracking of Metallic Materials

Report Number: AFML TR 70-2
Author: Fontana, Mars G.
Corporate Author: Ohio State Univ Columbus Dept Of Metallurgical Engineering
Laboratory: Air Force Materials Laboratory
Date of Publication: 1970-01
Pages: 210
Contract: F33615-69-C-1258
Project: 7312
Task: 731202
AD Number: AD0867061

Stress corrosion behavior of titanium alloys and high strength steels was studied. In titanium alloys the initiation and propagation of cracks in aqueous and methanolic environments is being studied as a function of alloy composition, electrochemical control, and applied stress. Corrosion processes within crevices are being studied. Straining electrode studies are also reported. Crack initiation in Ti-6Al-4V specimens was observed at alpha-beta interfaces and in beta grains. Studies of crack velocity show it to depend on applied stress but not on potential. Crevice studies show corrosion to be accelerated when the IR drop is large. In high strength steels the processes of transient passivity, dissolution of carbides, crack propagation and hydrogen permeation are being studied. The kinetics of transient passivity on iron alloy surfaces shows good agreement with classic models for growth of thin films. Dissolution of iron carbides is shown to depend on pH, potential and anion. The action of cathodic poisons such as arsenic is shown to depend on co-deposition of the poison species.

Lockheed Martin Missiles & Fire Control
Download this report

(PDF, 6.8 MB, 210 pages)

Other options for obtaining this report

Via the Defense Technical Information Center (DTIC):
A record for this report, and possibly a full-image download of the report, exists at DTIC

Via National Technical Information Service:
This report may have been digitized and made freely available for public download, or made publicly available for purchase by the National Technical Information Service through their online database, the National Technical Reports Library

Indications of Public Availability
No digital image of an index entry indicating public availability is currently available
There has been no verification of an indication of public availability from an inside cover statement