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Low temperature thermal aging of austenitic stainless steel welds: Kinetics and effects on mechanical properties

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Title Low temperature thermal aging of austenitic stainless steel welds: Kinetics and effects on mechanical properties
 
Creator CHANDRA, K
KAIN, V
BHUTANI, V
RAJA, VS
TEWARI, R
DEY, GK
CHAKRAVARTTY, JK
 
Subject Thermal aging
Embrittlement
Austenitic stainless steel
Spinodal decomposition
Microhardness
Imact toughness
FRACTURE-TOUGHNESS
ATOM-PROBE
G-PHASE
EMBRITTLEMENT
CF3
DECOMPOSITION
CHROMIUM
BEHAVIOR
FERRITE
METAL
 
Description Austenitic stainless steel welds in components used in light water reactors are susceptible to thermal aging embrittlement at reactor operating temperature of around 300 degrees C after a long service life. In this study, low temperature aging embrittlement of types 304L and 316L stainless steel welds with 10% ferrite was investigated on the basis of changes in mechanical properties and microstructure after aging up to 20,000h at 335, 365 and 400 degrees C. Spinodal decomposition and G-phase precipitation in the ferrite was observed after aging which lead to embrittlement in the material. In contrast to the small effect on tensile properties, the impact toughness was significantly degraded after aging. Charpy impact test of the aged samples showed decrease in upper-shelf and lower-shelf energy and increase in ductile brittle transition temperature. Large increase in the microhardness of ferrite phase was observed with no change in austenite hardness. The embrittlement in 316L weld was higher compared to 304L weld for similar aging condition. The kinetics of aging embrittlement was established based on Arrhenius relationship. A constant activation energy was determined for 304L weld in the temperature range 335-400 degrees C, however, 316L weld showed different activation energy values in each temperature range. (C) 2011 Elsevier B.V. All rights reserved.
 
Publisher ELSEVIER SCIENCE SA
 
Date 2014-10-16T15:37:19Z
2014-10-16T15:37:19Z
2012
 
Type Article
 
Identifier MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 534163-175
http://dx.doi.org/10.1016/j.msea.2011.11.055
http://dspace.library.iitb.ac.in/jspui/handle/100/15921
 
Language en