Abstract Continuous drive friction welding (CDW) is a state-of-the-art solid-state technology for joining metallic components used in aerospace, oil and gas, power generation industries. This study summarizes the results of mechanical microstructural investigations on modified AISI-8630 steel subjected to CDW. The effects process parameters, including rotational speed, friction, forge forces, d...

Wire and Arc Additive Manufacturing (WAAM), which exhibits high deposition rate low production cost, is a promising method for fabricating large-sized composite components. In this work, the WAAM process applied to fabricate steel matrix components by introducing WC/Fe powder into molten pool through gravity-driven side feeding. The effects of WC fraction on microstructure, mechanical propertie...

In quality control, microstructures are investigated rigorously to ensure structural integrity, exclude the presence of critical volume defects, and validate formation target microstructure. For quenched, hierarchically-structured steels, morphology bainitic martensitic major concern guarantee reliability material under service conditions. Therefore, industries conduct small sample-size inspect...

with careful design, mixed microstructures consisting of fine plates of upper bainitic ferrite separated by thinfilms of stable retained austenite have exhibited impressive combinations of strength and toughness in highsiliconbainitic steels. the silicon suppresses the precipitation of brittle cementite leading to an improvement intoughness. the essential principles governing the optimisation o...

Wire arc additive manufacturing (WAAM) is a metal 3D printing method that allows the cost-effective and efficient production of large-scale elements, has thus gained great interest from architects structural engineers. Integration this novel technology into construction industry, however, requires development clear understanding mechanical behaviour WAAM materials. To end, comprehensive experim...

4340 steel powders were processed with an additive manufacturing process using the FFF (Fused Filament Fabrication) technique. A composite filament was developed to print samples and study effect of bed nozzle temperatures on its physical microstructural properties. The printed debinded sintered by: Solid State (SS) at 1300 °C or SLPS (Supersolidus Liquid Phase Sintering) 1420 °C. Metallography...

There are precise observations which indicate the reluctance of excess carbon within bainite or martensite to partition into adjacent austenite in spite of prolonged heat treatment at temperatures where carbon is mobile. To explain this, we report the first calculations of the solubility of carbon in tetragonal ferrite that is in equilibrium with austenite. It is found that the solubility is dr...

The problems encountered with the interpretation of martensite and the various forms of bainite that are found in high strength steel weld metals have been addressed. Field emission gun scanning electron microscopy was found to overcome resolution difficulties often met with light optical microscopy and conventional scanning electron microscopy. The various microstructural constituents were cha...