Effect of nitrogen on the microstructure and stress corrosion cracking of stainless steel weld metals

Conference · Thu Mar 01 04:00:00 EST 1979 · Weld. J. (Miami); (United States)

OSTI ID:6170918

Baeslack, III, W A ^[1]; Savage, W F; Duquette, D J

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1. Air Force Materials Lab., Wright Patterson Air Force Base, OH

The nitrogen content of conventionally-produced 18Cr-8Ni stainless steel weld metals can vary considerably. Variations in base and filler metal nitrogen contents and nitrogen pickup from the atmosphere during welding can result in weld metal nitrogen contents ranging from below 0.04 to above 0.3 wt-%. The importance of nitrogen content on 18Cr-8Ni weld metal properties has been undetermined. Results of the present investigation show that nitrogen content in a range from approximately 0.04 to 0.25 wt-% influences both the mode of weld metal solidification and weld metal stress-corrosion cracking properties. Increased nitrogen contents promote the primary solidification of austenite. At high nitrogen levels (greater than about 0.2 wt-%) an entirely austenitic room-temperature microstructure is produced. Stress-corrosion crack propagation in these weld metals occurs interfacially at austenite-ferrite boundaries in the weld metal substructure.

• OSTI ID: 6170918
• Conference Information: Journal Name: Weld. J. (Miami); (United States) Journal Volume: 58:3
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102 -- Metals & Alloys-- Structure & Phase Studies
360105* -- Metals & Alloys-- Corrosion & Erosion
ALLOYS
CHEMICAL COMPOSITION
CHEMICAL REACTIONS
CHROMIUM ALLOYS
CHROMIUM STEELS
CHROMIUM-NICKEL STEELS
CORROSION
CORROSION RESISTANT ALLOYS
CRACKS
CRYOGENIC FLUIDS
CRYSTAL STRUCTURE
ELEMENTS
FILLER METALS
FLUIDS
FRACTURE PROPERTIES
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
IRON ALLOYS
IRON BASE ALLOYS
JOINTS
MATERIALS
MECHANICAL PROPERTIES
METALLURGICAL EFFECTS
MICROSTRUCTURE
NICKEL ALLOYS
NITROGEN
NONMETALS
PHASE TRANSFORMATIONS
SOLIDIFICATION
STAINLESS STEEL-18-8
STAINLESS STEEL-304
STAINLESS STEELS
STEELS
STRESS CORROSION
WELDED JOINTS