Weldable ductile molybdenum alloy development

摘要: Abstract Molybdenum and its alloys are attractive structural materials for high-temperature applications. However, various practical issues have limited use. One concern relates to the loss of ductility occurring in heat-affected weld zone caused by segregation oxygen grain boundaries. In this study, a series arc melted molybdenum been produced containing controlled additions B, C, Zr, Al. These were characterized with respect their tensile properties, smooth bend impact energy both base metal welds. compared very high purity low carbon cast reference. For discussion purposes separated into two categories: Mo–Al–B alloys, Mo–Zr–B alloys. The properties alloy welds higher levels exhibited slight improvement over unalloyed molybdenum, though base-metal all somewhat inconsistent better, or worse, than molybdenum. A best DBTT values welds, comparable slightly better contained volume fraction second-phase particles, boron boundaries believed displace resulting improved properties. fractions particles these prone brittle fracture. It is also noted that zirconium,