Influence of the Heat Input on the Dendritic Solidification Structure and the Mechanical Properties of 2.25Cr-1Mo-0.25V Submerged-Arc Weld Metal

Abstract The alloy 2.25Cr-1Mo-0.25V is commonly used for heavy wall pressure vessels in the petrochemical industry, such as hydrogen reactors. As these reactors are operated at elevated temperatures and high pressures, welding consumables require a beneficial combination of strength toughness well enhanced creep properties. mechanical properties known to be influenced by several parameters. This study deals with influence heat input during submerged-arc (SAW) on solidification structure multilayer metal. was found increase primary secondary dendrite spacing bainitic prior austenite grain size weld Furthermore, it determined that higher SAW causes an stress rupture time decrease Charpy impact energy. assumed linked lower number layers, therefore, decreased amount fine grained reheated zone if metal fabricated input. In contrast toughness, metal’s strength, ductility macro-hardness remain nearly unaffected changes