High temperature thermal-elastic analysis of dissimilar metal transition joints
Thermal-elastic analysis of dissimilar metal transition weld joints of a 24'' sodium piping system were performed. This piping system is for Liquid Metal Fast Breeder Reactor application, operating at elevated temperature (965/sup 0/F). These analyses form a basis for the selection of the material combination and weld preparation of the transition joints. Two material combinations were selected for weld joint thermal-elastic analysis: 2/sup 1///sub 4/ Cr-1 Mo ferritic steel to 316 stainless steel, 2/sup 1///sub 4/ Cr-1 Mo steel to Incoloy 800, with Inconel 82 as the welding metal in both cases. Weld preparations with various geometries were assumed for each material combination. The transition joints were evaluated for thermal loadings due to the changes in sodium temperatures during anticipated operating conditions of the breeder reactor. Thermal analyses were performed to define the temperature time history in the metals; the temperature gradient across the wall thickness; and especially, the temperature distribution near the material interfaces. The magnitude of the temperature gradients and the temperature distribution as affected by the heat transfer characteristics of each material were of particular interest. Stresses created due to the differences of thermal expansion of the materials, radial and axial temperature gradients, and applied internal pressure were evaluated using finite element analysis methods. In this investigation, the materials were treated as elastic and isotropic. The contributions from the applied pressure and thermal loading were separated from the total stresses and the most important contributor was identified. The elastic analyses served for a preliminary evaluation of the transition joint selection. Based on the information obtained in stress versus material combination and the stress variation as a function of the geometry of the weld preparation, a weld design (material combination and geometry) was selected.
- Research Organization:
- General Electric Co., Sunnyvale, CA
- OSTI ID:
- 7105572
- Journal Information:
- J. Eng. Mater. Technol.; (United States), Vol. 99:1
- Country of Publication:
- United States
- Language:
- English
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36 MATERIALS SCIENCE
LMFBR TYPE REACTORS
PIPES
WELDED JOINTS
STRESS ANALYSIS
CHROMIUM-MOLYBDENUM STEELS
ELASTICITY
INCOLOY 800
INCONEL 82
MECHANICAL PROPERTIES
STAINLESS STEEL-316
TEMPERATURE DISTRIBUTION
THERMAL STRESSES
ALLOYS
BREEDER REACTORS
CHROMIUM ALLOYS
CHROMIUM STEELS
CHROMIUM-NICKEL STEELS
CORROSION RESISTANT ALLOYS
EPITHERMAL REACTORS
FAST REACTORS
FBR TYPE REACTORS
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
INCOLOY ALLOYS
INCONEL ALLOYS
IRON ALLOYS
IRON BASE ALLOYS
JOINTS
LIQUID METAL COOLED REACTORS
MANGANESE ALLOYS
MATERIALS
MOLYBDENUM ALLOYS
NICKEL ALLOYS
NICKEL BASE ALLOYS
NIOBIUM ALLOYS
REACTORS
STAINLESS STEELS
STEELS
STRESSES
TANTALUM ALLOYS
TENSILE PROPERTIES
210500* - Power Reactors
Breeding
360104 - Metals & Alloys- Physical Properties