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Item type:Publication, Access status: without files , Fatigue life enhancement of TIG-welded 304L stainless steels by shot peening(2019-02-25); ; ; ; Shot peening is a cold working process that leads to changes of residual stress in the surface layer and the microstructure. In this paper, we studied the effect of the stress ratio and shot peening on the fatigue life of AISI 304L austenitic stainless steel welded using a fully manual gas tungsten arc welding process (GTAW). The specimens are prepared by welding flat plates with thickness of 1 mm using GTAW process and the 308 stainless steel as the filler metal. Results indicate that the fatigue life of the as-welded material under tension–compression loading (stress ratio R = − 1) is longer compared to fatigue life under tension–tension loading (stress ratio R = 0). Furthermore, the microhardness and fatigue life are found to be improved after shot peening post-welding treatment for durations ranging from 5 to 7 min. The improvement in tensile stress and microhardness of treated material is as good as the results reported using the more advanced and costly techniques. Also, the findings suggest that influence of duration of shot peening is more significant on the fatigue life than on the microhardness.Publicationtype: Journal Article228 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , Effect of corrosion pit density on the fatigue life of aluminum 1050A(2018-07-01); ; ; ; Fatigue and corrosion fatigue damage of materials is often the most important cause of frequent stops of machines and industrial equipment. For this, many researches are investigated in this field. The aim of this work is to study the effect of the corrosion pit density on the fatigue life of aluminum 1050A. Fatigue and corrosion fatigue tests carried out under tension-compression loading with load ratio R = − 1, at frequency of 78 Hz, and ambient temperature on not corroded and corroded specimens in 3.5% NaCl solution during different immersion times. From the experimental study, it was concluded that the pitting density increases as the immersion time increases and does not have a large effect on the fatigue strength of aluminum 1050A after 8-, 24-, 40-, 56-, and 72-h immersion.Publicationtype: Journal Article154