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Title: High temperature thermal-elastic analysis of dissimilar metal transition joints

Abstract

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 pressuremore » 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.« less

Authors:
; ;
Publication Date:
Research Org.:
General Electric Co., Sunnyvale, CA
OSTI Identifier:
7105572
Resource Type:
Journal Article
Journal Name:
J. Eng. Mater. Technol.; (United States)
Additional Journal Information:
Journal Volume: 99:1
Country of Publication:
United States
Language:
English
Subject:
21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS; 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

Citation Formats

Dalcher, A W, Yang, T M, and Chu, C L. High temperature thermal-elastic analysis of dissimilar metal transition joints. United States: N. p., 1977. Web. doi:10.1115/1.3443408.
Dalcher, A W, Yang, T M, & Chu, C L. High temperature thermal-elastic analysis of dissimilar metal transition joints. United States. https://doi.org/10.1115/1.3443408
Dalcher, A W, Yang, T M, and Chu, C L. 1977. "High temperature thermal-elastic analysis of dissimilar metal transition joints". United States. https://doi.org/10.1115/1.3443408.
@article{osti_7105572,
title = {High temperature thermal-elastic analysis of dissimilar metal transition joints},
author = {Dalcher, A W and Yang, T M and Chu, C L},
abstractNote = {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.},
doi = {10.1115/1.3443408},
url = {https://www.osti.gov/biblio/7105572}, journal = {J. Eng. Mater. Technol.; (United States)},
number = ,
volume = 99:1,
place = {United States},
year = {Sat Jan 01 00:00:00 EST 1977},
month = {Sat Jan 01 00:00:00 EST 1977}
}