Precipitation of intermetallic phases in 22% Cr duplex stainless weld metals

Journal Article · Sun Jan 01 04:00:00 EST 1995 · Welding Journal (Miami); (United States)

OSTI ID:6591128

Karlsson, L; Pak, S ^[1]; Ryen, L ^[2]

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1. Esab AB, Goeteborg (Sweden)
2. Chalmers Univ. of Technology, Goeteborg (Sweden). Dept. of Physics

The effect on corrosion resistance and impact toughness of intermetallic phases, formed in the temperature range of 675--1,000 C (1,247-1,832 F), was studied for 22%Cr 9%Ni 3%Mo 0.15%N-type duplex stainless weld metals. R-phase precipitated rapidly below 800 C (1472 F). [sigma]-phase successively replaced R-phase at 800 C and was the only phase forming at higher temperatures. Minor amounts of [chi]-phase formed at 800 C and continuous, Cr- and Mo-rich, grain boundary films were found after aging at 675 C. The decrease in impact toughness was most rapid around 900 C (1,652 F). Deterioration of corrosion resistance took place most quickly at 700 (1,652 F) and 900 C due to formation of R- and [sigma]-phase, respectively. Corrosion resistance and toughness are affected simultaneously above 800 C; whereas, loss of corrosion resistance precedes embrittlement at lower temperatures. A significant decrease of ferrite content or an increase in hardness indicates a lowered corrosion resistance and embrittlement. However, ferrite content or hardness cannot be used to guarantee unaffected properties. Loss of corrosion resistance or embrittlement of the weld metal will not occur if recommended welding procedures are followed.

• OSTI ID: 6591128
• Journal Information: Welding Journal (Miami); (United States), Journal Name: Welding Journal (Miami); (United States) Vol. 74:1; ISSN 0043-2296; ISSN WEJUA3
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
360103 -- Metals & Alloys-- Mechanical Properties
360105 -- Metals & Alloys-- Corrosion & Erosion
ALLOYS
CHROMIUM ALLOYS
CHROMIUM STEELS
CHROMIUM-MOLYBDENUM STEELS
CHROMIUM-NICKEL STEELS
CHROMIUM-NICKEL-MOLYBDENUM STEELS
CORROSION RESISTANCE
FRACTURE PROPERTIES
HIGH ALLOY STEELS
IMPACT STRENGTH
INTERMETALLIC COMPOUNDS
IRON ALLOYS
IRON BASE ALLOYS
MECHANICAL PROPERTIES
MICROSTRUCTURE
MOLYBDENUM ALLOYS
NICKEL ALLOYS
STAINLESS STEELS
STEELS