Microstructural modification during laser welding

Conference · Fri Jan 01 04:00:00 EST 1988

OSTI ID:5896398

David, S A; Vitek, J M

An investigation was carried out to determine the effect of rapid solidification on the weld metal microstructure of austenitic stainless steels and its implication on the ferrite constitution diagram. A wide variety of stainless steels were laser welded at different welding speeds and laser power levels. The results indicate that both weld pool cooling rate and the post solidification solid state cooling rates have a profound effect on the microstructures. For the steels investigated the microstructures ranged from duplex austenite (..gamma..) + ferrite (delta) to fully austenitic or fully ferritic. These microstructures were found to be sensitive to both cooling rates and composition. The observed results are rationalized based on rapid solidification theory. Cooling rate effects were incorporated into the ferrite constitution diagram to reflect the observed microstructural changes at high cooling rates of the weld metal. 10 refs., 8 figs., 2 tabs.

• Research Organization: Oak Ridge National Lab., TN (USA)
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 5896398
• Report Number(s): CONF-880137-1; ON: DE88002344
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360101 -- Metals & Alloys-- Preparation & Fabrication
360102* -- Metals & Alloys-- Structure & Phase Studies
ALLOYS
AUSTENITIC STEELS
CARBON ADDITIONS
CHROMIUM ALLOYS
CHROMIUM STEELS
CHROMIUM-NICKEL STEELS
COOLING
CORROSION RESISTANT ALLOYS
CRACKS
CRYSTAL STRUCTURE
ELEMENTS
FABRICATION
FERRITE
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
IRON ALLOYS
IRON BASE ALLOYS
JOINING
JOINTS
LASER WELDING
MANGANESE
MATERIALS
MATERIALS WORKING
METALS
MICROSTRUCTURE
MOLYBDENUM ALLOYS
NICKEL ALLOYS
NIOBIUM ADDITIONS
NIOBIUM ALLOYS
QUENCHING
SEGREGATION
SEMIMETALS
SILICON
SPLAT COOLING
STAINLESS STEEL-304
STAINLESS STEEL-308
STAINLESS STEEL-316
STAINLESS STEEL-347
STAINLESS STEEL-446
STAINLESS STEELS
STEELS
TRANSITION ELEMENTS
WELDED JOINTS
WELDING