The investigation of microstructural analysis is very critical in knowing the metallurgical properties of any material in the field of material science engineering. The objective of the work is to draw the information about the influence of process parameters on microstructure of Al 8011. Form drilling is a method of machining in which no chips are formed and performed by the combined action of force and thermal energy. The journal covers the microstructural variations of Al 8011 alloy upon performing the form drilling by varying process parameters. Scanning electron microscope analysis was performed after form drilling of parent material Al 8011 and formability of the material is analyzed using petal formation.
The study involved using a pulsed Nd: YAG laser welded Hastelloy C-276-Monel 400 dissimilar sheet by the process parameters viz. a pulse energy of 10 J, pulse repetition rate of 20 Hz and pulse duration of 0.006 seconds under spot weld mode. The objective was to investigate the effects of various post weld heat treatment (PWHT) conditions on the welded sheets. Microscopic analysis showed that the fusion zone and interfaces between the two metals contained smaller dendritic grains containing chromium-rich carbides and nickel-rich oxides. Both the Hastelloy C-276 and Monel 400 interfaces exhibited these traits. The PWHT of the quenched weld (water cooling) produced higher mechanical strength, while the annealed weld (furnace cooling) resulted in lower strength. Tensile failures were observed in the fusion zone for quenched and normalized welds, and in the base alloy of Hastelloy C-276 side for annealed weld under ductile fracture mode. XRD analysis showed the presence of more secondary phases and intermetallic compounds in the fusion zone and Hastelloy C-276 side in the annealed weld. The corrosion study indicated that the fusion zone and Monel 400 side had better corrosion resistance, followed by the Hastelloy C-276 side.
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