Postweld solution annealing effects on the ductility of Ni-Co-Cr-base alloy gas tungsten arc welds

Journal Article · Sun Dec 01 04:00:00 EST 1996 · Journal of Materials Engineering and Performance

DOI:https://doi.org/10.1007/BF02646914· OSTI ID:409708

Lim, C S; Baek, K K ^[1]

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1. Hyundai Heavy Industries Co., Ltd., Ulsan (Korea, Republic of). Hyundai Industrial Research Inst.

The welding characteristics of a commercial wrought alloy with a nominal composition of Ni-29Co-28Cr-2.75Si were investigated. Gas tungsten arc weldments with filler metal matching the chemistry of the alloy were found to have limited room-temperature ductility in the as-welded condition. Since welding is the main fabrication method of this alloy, the welding and postweld heat treatment (PWHT) characteristics were examined to provide guidelines for fabrication in the field. Metallographic evaluation revealed that the weld metal was characterized by the distribution of a continuous eutectic phase consisting primarily of (Si, Ti){sub x}Ni{sub y}. The continuous eutectic phase in the as-welded deposit, which caused poor ductility of the welds, was successfully reduced or removed with proper PWHT. The PWHT is necessary if cold forming of a weldment is required after welding or if adequate joint ductility is a design requirement. The recommended PWHT temperature is 1,050 C.

• Sponsoring Organization: USDOE
• OSTI ID: 409708
• Journal Information: Journal of Materials Engineering and Performance, Journal Name: Journal of Materials Engineering and Performance Journal Issue: 6 Vol. 5; ISSN 1059-9495; ISSN JMEPEG
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
42 ENGINEERING
BOILERS
BURNERS
CHEMICAL COMPOSITION
CHROMIUM ALLOYS
COBALT ALLOYS
DUCTILITY
EUTECTICS
GAS TUNGSTEN-ARC WELDING
HEATING
INCINERATORS
IRON ADDITIONS
MANGANESE ADDITIONS
METALLOGRAPHY
MICROSTRUCTURE
NICKEL ALLOYS
OPTIMIZATION
SILICON ALLOYS
TENSILE PROPERTIES
TITANIUM ADDITIONS
WELDED JOINTS