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The 'stress-corrosion-fatigue' performance of several high strength- aluminum alloys was investigated by tests of hydraulic cylinders and other types of specimens. Specimens were prepared from forgings and forging stock of alloys 2014-T6, 7075-T6, 7075-T73, 7079-T6, and X7080-T7 and from premium castings of alloy CH70-T7. Alloy 7075-T73 rated best in the corrosion-fatigue tests; no stress-corrosion cracking occurred in this alloy, and the lives of forged cylinders subjected to repeated loadings to 80% of design stress in a corrosive environment were at least 10 times as long for this alloy as for forged cylinders of alloys 2014-T6, 7075-T6, or 7079-T6. Fractographic examination showed that stress-corrosion cracking as well as fatigue cracking occurred in alloys 2014-T6, 7075-T6, and 7079-T6 in the stress-corrosion-fatigue tests. The investigation demonstrated that stress corrosion and fatigue can interact under certain conditions to produce failures in shorter times and fewer cycles than for either phenomenon occurring by itself.
The report summarizes information from selected European papers and lectures that were published or presented between mid 1967 and July 1, 1968. Subjects discussed include: the nature of stress-corrosion, stress-corrosion in AlMg, AlMgZn, and AlMgSi alloys and testing for susceptibility to stress-corrosion cracking. (Author).
A reference for materials scientists that can be used to find the effects of various corrosive media and processing variables on the stress-corrosion cracking and corrosion fatigue characteristics of ferrous and nonferrous alloys. There are more than 500 stress/cracking-time curves, S/N curves, and
Stress corrosion cracking, including hydrogen embrittlement, has probably attracted more attention in the last decade than any other single facet of the many that constitute the totality of the environment sensitive behaviour of materials. To some this is because the complex interactions between a number of parameters, particularly metal composition and structure, electrochemistry and the response of a metal to the application of stress, make the subject of stress corrosion fascinating. To others it is be cause the subject has become increasingly important in practical terms, as the problem of general corrosion has been controlled and the borderline conditions between widespread attack and com plete inactivity are more frequently encountered, and as materials have become more efficiently used by operating at higher stress levels than hitherto. Particularly in advanced engineering systems, such as pressure vessels used in transportation or in the chemical process industries or in the sophisticated equipment used in some of the energy producing industries, the incidence of stress corro sion failure has increased alarmingly in recent times and with consequences that are extremely costly if not worse. The reasons for holding a NATO Advanced Study Institute in this field are therefore obvious, but why publish the proceedings of the Institute in an age where there is, arguably, already a VIII superfluity of published material? Obe obvious answer is that the papers presented constitute valuable reviews of detailed develop ments in recent times.
The program determined threshold stress levels for 2014-T6, X2021-T8E31, 2024-T81, 2219-T87, X7002-T6, 7039-T64, and 7106-T6. Variables were sheet and plate, long transverse grain direction, welded and post-weld heat treated, notched and unnotched. Tests were conducted using step load and constant load 500 hours alternate immersion in synthetic sea water at sustained stress levels up to 75-percent yield strength. All basic, unwelded alloys, sheet and plate, had thresholds above 75-percent yield strength. Thresholds for unnotched sheet alloys were below 75-percent yield strength for 2014-T6, as welded (W), weld + age (A) and weld + solution heat treat + age (S), X2021-T8E31 (W), 2024-T81 (W), 2219-T87 (S), 7039-T64 (S) and 7106-T6 (A) (S). The most susceptible to stress corrosion cracking was X2021-T8E31 (W). A fatigue crack at the edge of the weld bead caused increased susceptibility to stress corrosion for several of the sheet alloy-weld-tempers. For unnotched plate product, stress corrosion cracking was incurred for only 2014-T6 (S) and 7039-T64 (S) below 75-percent yield strength; this was at higher stress levels than the (W) and (A) tempers tested. A fatigue crack at the edge of the weld bead caused severe susceptibility to stress corrosion cracking for plate alloys, X-2021-T8E31 (S), 7039-T64 (S) and 2014-T6 (S). An Engineering Data Materials Matrix is presented. Stress corrosion cracking typically initiated at the edge of the weld bead and progressed along the fusion line branching into the weld bead and heat affected zone. (Author).