Showing papers on "Peening published in 1972"
TL;DR: In this article, an up-to-date review of the STRESS CORROSION CRACKing performance of high-strength ALUMINUM alloys is presented.
Abstract: AN UP TO DATE REVIEW OF THE STRESS CORROSION CRACKING PERFORMANCE OF WROUGHT HIGH STRENGTH ALUMINUM ALLOYS IS PRESENTED. SPECIAL EMPHASIS IS PLACED ON FACTORS OF MICROSTRUCTURE AND ITS DIRECTIONALITY AND THE EFFECT OF ANCILLARY ALLOYING ELEMENTS AND ENVIRONMENTAL FACTORS. EXAMPLES OF TYPICAL SERVICE PROBLEMS ENCOUNTERED WITH STRESS CORROSION CRACKING OF HIGH STRENGTH ALUMINUM ALLOYS ARE DESCRIBED ALONG WITH MEANS OF COMBATING THEM, SUCH AS PEENING, COATINGS, OR THE USE OF SPECIAL STRESS CORROSION RESISTANT ALLOYS.
15 citations
TL;DR: In this paper, the effect of shot peening on the fatigue strength of high strength titanium alloys was investigated and the results showed that when the basis metal was shot peened to a sufficiently high intensity no significant loss in fatigue strength occurred even after chromium plating and heat treatment at 450°C for 1 hour.
Abstract: SummaryChromium plating high strength titanium alloys reduces the alloys’ fatigue strength by approximately 80%. Tests have been carried out to establish whether this loss in fatigue strength can be avoided by adequate shot peening of the titanium substrate prior to plating. The method employed to secure adherent electrodeposited coatings on to titanium alloys IMI 314 and IMI 680 involved a post plating heat treatment at 450°C for 1 h. Therefore it was necessary to confirm whether the beneficial effect of shot peening was maintained following this heat treatment. The results showed that when the basis metal was shot peened to a sufficiently high intensity no significant loss in fatigue strength occurred even after chromium plating and heat treatment at 450°C for 1 hour.
4 citations
TL;DR: In this paper, the inhibition of stress corrosion by peening can best be explained in terms of the generation of a highly deformed surface layer within which preferred cracking paths (grain boundaries) have been disrupted, in addition to residual compressive stress effects.
Abstract: Stress corrosion tests on heat treated low alloy steel specimens in aqueous Ca(NO3)2-NH4NO3 solutions at 100 C (212 F) show that even for highly polished samples, at least 50% of the time required to produce failure under stress corrosion conditions is taken up by a process that is not accelerated by an applied tensile stress. It is further shown that the inhibition of stress corrosion by peening can best be accounted for in terms of the generation of a highly deformed surface layer within which preferred cracking paths (grain boundaries) have been disrupted, in addition to residual compressive stress effects. X-ray measurements were made to determine the residual compressive stress introduced by the peening treatment, the amount of retained austenite present in the specimens, and the composition of the oxide film formed during corrosion.
1 citations