The influence of composition and microstructure on the HAZ toughness of duplex stainless steels at [minus]20 C
- Edison Welding Inst., Columbus, OH (United States)
- Ohio State Univ., Columbus, OH (United States)
The toughness of two commercial duplex stainless steels, Ferralium Alloy 255 and Alloy 2205, was evaluated over a range of cooling rates representative of conditions in the weld heat-affected zone (HAZ). Both alloys exhibited a loss in toughness at the cooling rate extremes, 90 and 2 C/s, resulting from high ferrite content and larger prior ferrite grain size, respectively. Alloy 255 also showed a drop in toughness at an intermediate cooling rate of 50 C/s. This intermediate loss in toughness, not observed in Alloy 2205, results from the interrelationship between austenite and Cr-rich precipitate formation along ferrite grain boundaries. The precipitation mechanisms and their subsequent effect on toughness are described. The practical implications of HAZ microstructure control are also discussed.
- OSTI ID:
- 7045482
- Journal Information:
- Welding Journal (Miami); (United States), Vol. 73:4; ISSN 0043-2296
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
HEAT AFFECTED ZONE
FRACTURE PROPERTIES
MICROSTRUCTURE
STAINLESS STEELS
CHROMIUM
EXPERIMENTAL DATA
WELDABILITY
ALLOYS
DATA
ELEMENTS
HIGH ALLOY STEELS
INFORMATION
IRON ALLOYS
IRON BASE ALLOYS
MECHANICAL PROPERTIES
METALS
NUMERICAL DATA
STEELS
TRANSITION ELEMENTS
ZONES
360103* - Metals & Alloys- Mechanical Properties
360102 - Metals & Alloys- Structure & Phase Studies