The Study on the Migration of Carbon in T23/T91 Dissimilar Metal Welds for Boiler

Published on Nov 30, 2014
· DOI :10.12656/JKSHT.2014.27.6.288
Ki-Duck Park , Byong-Ho Jung , Chang-Yong Kang1
Estimated H-index: 1
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5 Authors (Barry Messer, ..., Terry Phillips)
#2Sang Hoon Kim (Hanyang University)H-Index: 9
Abstract The post-weld heat treatment (PWHT) cracking susceptibilities of T23 steel welded with four types of filler metals were evaluated by measuring the stress-rupture parameters (SRP), which are based on both the stress-rupture strength and the stress-rupture ductility. Post-weld heat treatment cracking tests were performed on T23 weld metals using a Gleeble system at temperatures of 650–750 °C and at stress levels of 100–500 MPa. The results showed that the weld metals with a higher SRP exh...
#1J.C. Chang (KEPCO: Korea Electric Power Corporation)H-Index: 1
#2Bum-Shin Kim (KEPCO: Korea Electric Power Corporation)H-Index: 3
Last. N.H. Heo (KEPCO: Korea Electric Power Corporation)H-Index: 1
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Abstract T/P 23 weld failures occurred in coal fired supercritical power plants were investigated and possible causes were considered. Susceptibility of stress relief cracking was tested through mechanical properties varying heat treatment conditions in weld and intrinsic stress level in the pipe system was calculated by FEM analysis using displacement data. We also investigated what elements in the filler composition affected stress relief cracking examined. The results showed any serious susce...
#1J. C. Chang (KEPCO: Korea Electric Power Corporation)H-Index: 2
#2Nam Hoe Heo (KEPCO: Korea Electric Power Corporation)H-Index: 13
Last. Changhee Lee (Hanyang University)H-Index: 1
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The difference in elevated temperature fracture behaviors of 2.25Cr1.3W (P23) and 9Cr1MoVNb (P91) steels has been investigated through simple rupture tests. P91 showed a ductile fracture behavior in the test conditions. This is due to the strong grain boundary strengthening effect of segregated molybdenum. The intergranular fracture behavior observed only in P23 is due to the strong segregation of impurities (especially, phosphorus) and the decrease in bulk content of the grain boundary strength...
In the paper, steels are studied that are mostly used in technical practice as base materials, filler metals, and consumable electrodes in the design of dissimilar weld joints. These steels differ mainly in the content of Cr, Mo, V, W, and N. It is explained and emphasized in the paper that the effect cannot be underrated of thermodynamics, diffusion and phase transformations on the stability of dissimilar weld joints that are exposed to temperatures of over ca. 500degC during operation. For all...
#1Ronald L. Klueh (ORNL: Oak Ridge National Laboratory)H-Index: 41
#2Andrew T. Nelson (ORNL: Oak Ridge National Laboratory)H-Index: 20
Concepts for the next generation of nuclear power reactors designed to meet increasing world-wide demand for energy include water-cooled, gas-cooled, and liquid-metal-cooled reactors. Reactor conditions for several designs offer challenges for engineers and designers concerning which structural and cladding materials to use. Depending on operating conditions, some of the designs favor the use of elevated-temperature ferritic/martensitic steels for in-core and out-of core applications. This class...
#1Fujio Abe (National Institute for Materials Science)H-Index: 52
Abstract Great advancement has been achieved in the analysis of specific microstructure instability causing a loss of creep strength at 550 °C and above, the prediction of onset time of the creep strength loss and theoretical modeling of precipitation sequences in power plant steels. A number of new alloy-design concepts based on microstructure stabilization have been proposed for the development of highly creep-resistant bainitic 3Cr and martensitic 9–12Cr steels with higher creep rupture stren...
#1C. Sudha (RRC: Indira Gandhi Centre for Atomic Research)H-Index: 3
#2A. L. E. Terrance (RRC: Indira Gandhi Centre for Atomic Research)H-Index: 7
Last. M. Vijayalakshmi (RRC: Indira Gandhi Centre for Atomic Research)H-Index: 24
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Abstract The microstructural stability and elemental redistribution in dissimilar weldments between 9Cr–1Mo and 2.25Cr–1Mo ferritic steels during various postweld heat treatments (PWHTs) have been studied using microscopy techniques ranging from optical to transmission electron microscopy and electron probe microanalyser. Application of PWHT at 1023 K for various times resulted in the formation of a soft zone in the low Cr side and a carbide rich hard zone adjoining the soft zone in the high Cr ...
#1Kouichi Maruyama (Tohoku University)H-Index: 31
#2Kota SawadaH-Index: 6
Last. Junichi Koike (Tohoku University)H-Index: 39
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The creep deformation resistance and rupture life of high Cr ferritic steel with a tempered martensitic lath structure are critically reviewed on the basis of experimental data. Special attention is directed to the following three subjects: creep mechanism of the ferritic steel, its alloy design for further strengthening, and loss of its creep rupture strength after long-term use. The high Cr ferritic steel is characterized by its fine subgrain structure with a high density of free dislocations ...
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