CAJ | 학술논문

研究C元素对TiAl基合金(Ti-45Al-3Fe-2Mo)显微组织的影响。随着C元素含量的增加，合金中β相含量的比例降低，而片层晶团尺寸增大。当C含量增加至0.3%和0.5%时，片层间距从267 nm降低至237 nm和155 nm，但是进一步增加C含量，片层间距长大至230 nm。这是由C原子的抑制作用及碳化物的析出引起的。800°C时效可以使P-型碳化物析出。随着时效时间的延长，该碳化物主要在晶界处及位错线附近析出并长大，并在不同的入射角(TEM)下有不同的形貌。对其显微组织的变化进行了详细的分析及探讨。
연구C원소대TiAl기합금(Ti-45Al-3Fe-2Mo)현미조직적영향。수착C원소함량적증가，합금중β상함량적비례강저，이편층정단척촌증대。당C함량증가지0.3%화0.5%시，편층간거종267 nm강저지237 nm화155 nm，단시진일보증가C함량，편층간거장대지230 nm。저시유C원자적억제작용급탄화물적석출인기적。800°C시효가이사P-형탄화물석출。수착시효시간적연장，해탄화물주요재정계처급위착선부근석출병장대，병재불동적입사각(TEM)하유불동적형모。대기현미조직적변화진행료상세적분석급탐토。
The effect of carbon addition on the microstructures of TiAl-based alloy (Ti-45Al-3Fe-2Mo) was studied. The proportion ofβ/B2 phase reduces with the content of carbon increasing, while the colony size increases. With increasing the carbon content, the lamellar spacing first decreases from 267 nm (Ti-45Al-3Fe-2Mo) to 237 nm (Ti-45Al-3Fe-2Mo-0.3C) and 155 nm (Ti-45Al-3Fe-2Mo-0.5C), but then increases to 230 nm (Ti-45Al-3Fe-2Mo-1.0C) with further increase in C level, which is affected by the inhibition of carbon atom and precipitation of carbides at the lamellar interface. Precipitation of carbides shows a response to aging time at 800 °C. P-type carbides grow up at the boundaries and near the dislocation areas with the prolonging of aging time. And these carbides are projected different morphology in different beam directions (BD). The effects of these microstructural modifications were examined and the observations were discussed.