Creep Behavior of 2.25Cr-1Mo Steel Shield Metal Arc Weldment
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概要
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In order to guarantee the safety of high temperature components and prevent unscheduled outage, remnant life assessment for creep is quite important. The experiences in actual components reveal that almost all the problems relating to creep are generated at the weldment, which contains microstructures with different creep properties from those presumed in the parent material. Nowadays, it is generally accepted that a terminal failure mode of low alloy ferritic steels or tempered martensitic steels become Type IV, taking place at the Intercritical HAZ or Fine Grained HAZ. However, in the present work using 2.25Cr-1Mo steel welds fabricated with basic coated Shield Metal Arc Weld (SMAW) consumables, the most prevalent failure mode was Type I in the center of weld metal rather than Type IV. And this tendency was more pronounced at low stresses, suggesting the possibility of Type I cracking in actual components. It was concluded that poor creep strength of 2.25Cr-1Mo weld metal was ascribed to its fully bainitic microstructure in which carbides evolution was accelerated and M2C depletion took place earlier than base metal.
- 2004-03-15
著者
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Fujibayashi Shimpei
Engineering Design & Technical Development Idemitsu Engineering Co. Ltd.
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Fujibayashi Shimpei
Engineering Center Idemitsu Engineering Co. Ltd.
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KAWANO Koji
Engineering Design & Technical Development, Idemitsu Engineering Co., Ltd.
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KOMAMURA Takayuki
Engineering & Maintenance Department, Idemitsu Kosan Co., Ltd.
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SUGIMURA Takaya
Engineering & Maintenance Department, Idemitsu Kosan Co., Ltd.
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Kawano Koji
Engineering Design & Technical Development Idemitsu Engineering Co. Ltd.
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Sugimura Takaya
Engineering & Maintenance Department Idemitsu Kosan Co. Ltd.
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Komamura Takayuki
Engineering & Maintenance Department Idemitsu Kosan Co. Ltd.
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FUJIBAYASHI Shimpei
Engineering Center
関連論文
- Life Prediction of Low Alloy Ferritic Steels Based upon the Tertiary Creep Behavior
- Hardness Based Creep Life Prediction for 2.25Cr-1Mo Superheater Tubes in a Boiler
- A Comparative Study on the Θ Projection and the Ω Method
- Cross-weld Creep Behavior and Life Prediction of Low Alloy Ferritic Steels
- Creep Behavior of 2.25Cr-1Mo Steel Shield Metal Arc Weldment
- Effect of Carbide Morphology on the Susceptibility to Type IV Cracking of a 1.25Cr-0.5Mo Steel
- Creep Behavior at the Intercritical HAZ of a 1.25Cr-0.5Mo Steel
- The Effect of Grain Boundary Cavities on the Tertiary Creep Behavior and Rupture Life of 1.25Cr-0.5Mo Steel Welds
- Grain Boundary Damage Evolution and Rupture Life of Service-exposed 1.25Cr-0.5Mo Steel Welds
- Creep Behavior and Rupture Life of the Simulated Intercritical HAZ for 1.25Cr-0.5Mo Steel under a Multiaxial Stress State