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Showing 1 to 20 of 60 for “"Heat-affected zone"”.
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The Effect of Niobium in the Heat-affected Zone of Microalloyed Steel
… views on the influence of niobium in the `heat-affected zone', particularly in the region closest to the weld fusion line which is most dramatically impacted by the thermal cycling that occurs during welding. Consequently, there is a need to fully characterise the influence of niobium on …
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A Correlation of Microstructure With Hot-Ductility in the Heat-Affected Zone of Inconel 718.
… such stresses, cracking may occur in the fusion zone or in the weld heat-affected zone (HAZ). The objective of this study was to obtain a better understanding of hot cracking in the weld HAZ by making a correlation between the HAZ microstructure and the HAZ hot-ductility.
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Physical metallurgical basis for heat-affected zone and base-plate properties of a microalloyed HSLA steel, A
Includes bibliographical references.
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The effects of hydrogen on the fracture behavior of welded carbon steel plate
… that hydrogen lowers J<sub>C</sub> in both the heat affected zone and the base metal. In 350 psi helium, the experimental value of J<sub>C</sub> in the heat affected zone (2826 in.-lbs./in.<sup>2</sup>) was greater than that obtained in the base metal (1650 in.-lbs./in.<sup>2</sup>). The tests …
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Heat transfer during pulsed laser cutting of thin sheets
… a finite difference scheme based on sensible heating to the phase change temperature and a single value of latent heat (melting or vaporization). The pulsed laser model predicts a heat-affected zone of less than 0.02 mm for pulsed laser cutting. For comparable cutting with a continuous power …
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Susceptibility of creep aged material to stress relief cracking during repair welding
… welding technology. In section two the heat-affected zone is discussed with emphasis on the residual stresses that develop in this zone. The mechanical properties of the heat-affected zone are also investigated. This includes the tensile, toughness and hardness properties as well as …
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High temperature cracking of nickel chromium austenitic steels.
… weld metal and liquation cracking in the HAZ (Heat Affected Zone) ): Type 2 - separations associated with relatively clean grain boundaries caused by grain boundary sliding in the solid state and they are synonymous with creep rupture. This form of cracking is referred to as ductility dip …
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Crack Tip Micromaching by Femtosecond Laser for Fracture Testing of Metal Laminates
… motivation of this study is to characterize the heat affected zone in the materials produced by ultrafast laser processing to determine whether ultrafast laser ablation is a viable method for creating artificial cracks for SEM in-situ mini cantilever fracture testing. A parameter space is defined …
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Measurement and finite element modelling of temperatures in welding processes
… at locations just within or very near to the heat affected zone and at locations remote from the heat affected zone to record the temperature history during welding and cooling. Related analytical theories were studied and used to validate the finite element models. The method of superposing …
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Three-dimensional transient thermo-elasto-plastic modeling of gas metal arc welding using the finite element method
… a three-dimensional finite element transient heat transfer model has been developed for the autogenous Gas Tungsten Arc Welding (GTAW) process which does not require the complicated metal transfer modeling. A mathematical model to calculate arc heat input when the welding torch is inclined at …
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Effect of residual stress gradients in austenitic stainless steels on stress corrosion cracking
… stresses developed during simulated weld heat affected zone in austenitic stainless steel specimen on the stress corrosion cracking susceptibility was studied. Residual stresses was measured using X-ray diffraction technique. Boiling Magnesium Chloride was used as corrosive environment. …
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Effects of cold metal transfer welding on properties of ferritic stainless steel
… is welded as a result of grain coarsening in the heat affected zone. Welding equipment manufacturers are constantly incorporating new technologies and capabilities into welding equipment, to make welding easier and create better welds, which then gives that manufacturer a competitive advantage. …
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Metallurgical characterization and residual stress measurements of target structural materials
… stainless steel showing the weld metal, heat-affected-zone and the base metal.
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Surface integrity of laser cutting nitinol shape memory alloy
… which may generate thermal damage such as heat affected zone (HAZ), recast layer, micro-cracks, and tensile residual stresses. The thermal damage and ablation-induced contamination are critical technical barriers for fatigue performance and biocompatibility of Nitinol stents. To reveal the …
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Stress corrosion cracking and hydrogen embrittlement of thick section high strength low alloy steel
… triaxial stress in the presence of hydrogen. The heat-affected zone of the weldment was found to be the most susceptible portion of the weld joint. A lower bound was established for the critical stress intensity for stress corrosion cracking for HSLA 80 base metal and weldments.
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Integration of substrate in aluminium wire and arc additive manufacturing
… tests in as-deposited, inter-pass rolled and heat treated conditions. In the as-deposited condition, the mechanical properties achieved were significantly lower than those of wrought material, with a yield strength up to 150 MPA lower than this achieved by heat treated wrought alloy. After …
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The influence of prior creep damage on the fracture localisation in X20 CrMoV12-1 cross-weld creep tests
… welded cross-weld samples. Once ruptured, the zone of rupture, was identified and created in a larger volume by simulation using Gleeble® thermo-mechanical equipment. The as-received base materials were subjected to different operating conditions hence contain different degrees of creep damage. …
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Corrosion behaviour of welded joints within chloride and chloride/CO[2] environments.
… microstructures, i.e., weld metal (WM), heat-affected zone (HAZ) and parent plate (PP) respectively. Samples were freshly ground before exposure to the different aqueous chloride solutions. SVET was used during these investigations to evaluate preferential corrosion susceptibilities of …
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Effect of aqueous environments on the fatigue behavior of 90-10 copper nickel
… rate of corrosion was less in the weld and the heat affected zone than in the base metal. As the pH of the environment was lowered, the corrosion rate of 90-10 copper nickel increased due to the retardation of film formation and repassivation. These studies showed that three different mechanisms …
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Post-fire Mechanical Properties of Aluminum Alloys and Aluminum Welds
… alloys. Post-fire exposure is considered heating the material to a particular temperature then cooling the material back to room temperature. The research included evaluating parent materials as well as welded samples. Post-fire mechanical properties of parent materials were evaluated at …
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