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Vol.42, No.5, 403 ~ 409, 2004
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| Title |
| Effect of Tempering Treatment before Aging on the Microstructure and Mechanical Properties of Ferritic Heat-resistant Steels |
| 강창룡 Chang Yong Kang , 김재환 Jae Hwan Kim , 김익수 Ick Soo Kim , 서장현 Jang Hyun Sung , 배동수 Dong Soo Bea , 이해우 Hae Woo Lee |
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| Abstract |
| This study investigated the effect of the tempering before aging on the precipitation of Laves phase and mechanical properties of 10Cr-6W and 10Cr-6W-3Co ferritic heat-resistant steels. Laves phase was precipitated by aging, which increase tensile strength but decreased elongation and impact value. Toughness was rapidly decreased by the presence of the very fine disk-like Laves phase precipitated at early aging stage. Strength and impact value were decreased by tempering treatment and that is due to the increase of the particle number per unite area and to larger particle size of Laves phase. Laves phase increased by adding Co, and consequently strength was increased and elongation and toughness were decreased. (Received February 26, 2004) |
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| Key Words |
| Laves phase, Ferritic heat-resistant steels, Tempering, High temperature strength, Aging |
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