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• W2248748329 abstract "This research work deals with the studies conducted to assess the fracture and fatigue behaviour of a Nb-V microalloyed (MA) steel and a Ni-Cr low alloy (LA) steel in their asreceived and welded conditions. Fracture Mechanics principles were employed to evaluate the fracture initiation, fatigue initiation and fatigue crack propagation behaviour in the above alloys and their weldments prepared by employing submerged arc welding (SAW) process. The effects of crack orientation (i.e. thickness, weld centre-line and transverse to weld), variation in heat input and the condition of welded joint (e.g. as-welded versus stressrelieved) on the above properties have been demonstrated. The fatigue crack initiation and propagation studies were conducted for both the MA and LA steels. The fracture initiation studies, however, were performed only for MA steel. For the MA steel, all the studies were performed on specimens extracted from single bevel butt joints. In case of LA steel, the fatigue initiation studies were conducted on specimens obtained from multilayered weld deposits and in the thickness direction only; whereas, for fatigue crack growth studies, specimens prepared from single bevel butt joints were used. All the investigations were performed in the laboratory environment at ambient temperature. Chapterwise detail of the report follows. Chapter 1 presents an introduction to the various studies undertaken in the present investigation. The significance and the relevance of the proposed research topic have been highlighted. Chapter 2 presents a review of literature on the subject concerning the present investigation. It starts with a review on the status of the materials selected for this study along with the welding processes employed to fabricate structures using them. This is followed by a detailed review on the conventional test methods used to evaluate the various parameters relating materials, strength, toughness, fracture and fatigue properties along with their limitations. The next subsection pi-esents a review on the various fracture mechanics parameters to characterise the fracture initiation, resistance to slow stable tearing, fatigue initiation, fatigue crack propagation, etc. In the light of the literature review, the aim and the scope of the proposed investigation have been spelled out. Chapter 3 deals with the experimental programme covering the details of welding and test procedures. An account of materials, preparation of test specimens and heat treatment, etc. have been presented. The experimental techniques for evaluation of tensile properties, crack tip opening displacement (CTOD) toughness, crack growth resistance curves (R-curves), tearing moduli, etc. for the base metal, weld metal and heat affected zone (HAZ) have been presented. The procedure for the determination of the fatigue crack initiation and propagation characteristics have also been detailed. The experimental techniques employed for investigating other aspects of this study namely, hardness survey, optical metallography and SEM fractography have been described. Chapter 4 presents the results of the hardness, metallographic and fractographic studies from different zones of the weldments of the steels investigated. Typical optical and SEM micrographs revealing microstructural details of different regions have been presented. The microscopic features of fracture and fatigue revealing the mechanisms of the failures are highlighted through the results of fractography. Chapter 5 is concerned with the fracture initiation studies in MA steel. Expressions for R-curves are presented along with discussions on them. The CTOD fracture toughness of base metal, weld metal and the HAZ of the weld joints, determined by using R-curve methodology are reported and discussed. Computation and analysis of tearing moduli for the different zones of weld joint have been included. The effects of crack orientation and weld condition on the fatigue initiation behaviour of the steels investigated have been demonstrated. Chapter 6 presents the results of fatigue initiation studies in the two steels. For the MA steel, the results of the initiation studies in two directions (i.e. along the weld centre-line and transverse to it) along with the influence of the stress-relieving heat treatment are presented. Fatigue crack initiation models and initiation threshold levels are reported and discussed. In addition, the results of the initiation studies conducted in the thickness direction of multilayered LA steel weldments as influenced by different combinations of welding wires and fluxes have been reported and discussed. Chapter 7 presents the results and discussion of the fatigue crack propagation studies in the butt joints of the steels under investigation. The resistance to fatigue crack propagation of the as-received steels vis-a-vis the weld joints has been examined. Besides, the influence of crack orientation, heat input and weld condition on the fatigue crack propagation characteristics of the weld joints has been demonstrated. Chapter 8 consolidates the results and the discussions presented in Chapters 4 through 7. Some additional correlations have also been included. Chapter 9 is devoted to the conclusions derived from the present investigations. Finally, a list of references has been presented at the end." @default.
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• W2248748329 date "1995-01-01" @default.
• W2248748329 modified "2023-09-27" @default.
• W2248748329 title "Fracture and fatigut characteristics of ARC welded structural steels." @default.
• W2248748329 hasPublicationYear "1995" @default.
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