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Vol.41, No.7, 395 ~ 405, 2003
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| Title |
| Effect of Thermal Exposure on the Microstructure and Tensile Properties of Superalloy B1900 |
| 김인수 Kim In Soo , 최백규 Choi Baig Gyu , 서성문 Seo Seong Moon , 조창용 Jo Chang Yong |
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| Abstract |
| Influence of thermal exposure on microstructural evolution and tensile properties of Ni-base superalloy B1900 has been investigated. Phase transformations during thermal exposure and their effects on tensile behavior of the alloy have been analyzed by microstructural observations. Considerable amount of acicular type M_(6)C carbide precipitated in the interdendritic regions (including γ/γ` eutectic) and in the vicinity of MC carbide as a result of thermal exposure above 871°C. Thermal exposure also assisted precipitation of small discrete M_(23)C_(6) carbide which is hard to be found in the alloy. Thermal exposure deteriorated tensile properties of the alloy. The effect of M_(6)C precipitation on the tensile properties of the alloy is not clear. However, degradation of tensile properties of the alloy is primarily attributed to the coarsening of y` phase during thermal exposure. While the localized deformation bands were observed in the as-cast tensile specimen due to shearing of γ` particle, dislocation network formed at γ/γ`interface in the thermally exposed tensile specimen. |
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| Key Words |
| B1900, Carbide, Thermal exposure, Tensile properties, γ`, Deformation band |
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