Microstructural characterization of autogenous GTA welds in a 12Cr-1Mo-0. 3V steel
In support of the national fusion energy effort, the weldability of a 12Cr-1Mo-0.3V martensitic stainless steel has been investigated. This alloy is a leading candidate for the first wall/blanket of the ETF (Experimental Test Facility) fusion reactor. The initial investigation has utilized both the continuous cooling transformation diagram and the equilibrium phase diagram to rationalize the microstructures observed in the fusion zone and heat-affected zone of gas tungsten-arc welds. Regions of maximum hardness were observed within the fusion zone and in the coarse-grained region of the heat-affected zone where the predominant microstructural constituent was untempered martensite. Regions of the heat-affected zone which either contained a mixture of untempered martensite and carbides or were not fully reaustenitized during the weld thermal cycle exhibited a lower as-welded hardness. The presence of residual ferrite in an untempered martensite matrix along the weld fusion line also resulted in a localized drop in hardness. The on-heating and on-cooling transformation behavior of the alloy, as determined with the aid of the Gleeble dilatometer, corroborated both the microstructural observations and the hardness data.
- Research Organization:
- Sandia National Labs., Livermore, CA (USA)
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 6876136
- Report Number(s):
- SAND-80-8236
- Country of Publication:
- United States
- Language:
- English
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ALLOYS
BREEDING BLANKETS
CHROMIUM ALLOYS
CORROSION RESISTANT ALLOYS
CRYSTAL STRUCTURE
FABRICATION
FIRST WALL
IRON ALLOYS
IRON BASE ALLOYS
JOINING
JOINTS
MICROSTRUCTURE
MOLYBDENUM ALLOYS
REACTOR COMPONENTS
STAINLESS STEELS
STEELS
THERMONUCLEAR REACTOR WALLS
VANADIUM ALLOYS
WELDED JOINTS
WELDING