Modeling of thermomechanical conditions in Sigmajig weldability test

Technical Report · Tue Aug 01 04:00:00 EDT 1995

DOI:https://doi.org/10.2172/102201· OSTI ID:102201

Feng, Z; Zacharia, T; David, S A ^[1]

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1. Oak Ridge National Lab., TN (United States). Metals and Ceramics Div.

A finite element model has been developed to evaluate quantitatively the thermomechanical conditions for weld metal solidification cracking of a nickel based superalloy single-crystal in a laboratory weldability test, namely, the Sigmajig test. The effects of weld pool solidification on the thermal and mechanical behaviors of the specimen were considered. Stress-temperature-location diagrams were constructed to reveal the complex local stress development at the trailing edge of the weld pool. The calculated local stress in the solidification temperature range is used to explain the experimentally observed initiation of solidification cracking of the single-crystal under different welding and loading conditions, based on the material resistance versus the mechanical driving force.

• Research Organization: Oak Ridge National Lab., TN (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 102201
• Report Number(s): CONF-950682--5; ON: DE95016353
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CRACK PROPAGATION
EXPERIMENTAL DATA
GAS TUNGSTEN-ARC WELDING
HEAT RESISTING ALLOYS
MATHEMATICAL MODELS
NICKEL BASE ALLOYS
THEORETICAL DATA
THERMAL STRESSES
WELDABILITY