Formation of Austenite and Dissolution of Carbides in Fe-8.2Cr-C Alloys
Formation of Austenite and Dissolution of Carbides in Fe-8.2Cr-C Alloys
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Fe-8.2Cr-C合金中奥氏体的形成和碳化物的溶解
DOI：
10.1515/ijmr-1999-900106
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发表时间：
1999
期刊：
影响因子：
--
通讯作者：
Y. Ohmori
中科院分区：
文献类型：
--
作者：
D. Shtansky;K. Nakai;Y. Ohmori
研究了铁素体层状碳化物和铁素体球化碳化物初始组织为Fe-8.2Cr-0.2C和Fe-8.2Cr-0.96 C（质量%）合金的奥氏体形成机理和碳化物溶解动力学。用透射电镜对850 ~ 900℃范围内奥氏体形成的形貌进行了详细的研究。奥氏体的形核和生长机制取决于成分、起始组织和奥氏体化温度。研究了850 ~ 1150℃奥氏体化温度和时间对m23c6和m7c3碳化物演化的影响。观察到转化产物的不同形态。确定了铁素体、奥氏体和碳化物的取向关系。观察到的结果可以通过假设反应过程中运动界面处的局部平衡来解释。
The mechanism of austenite formation and the kinetics of carbide dissolution have been studied in Fe-8.2Cr-0.2C and Fe-8.2Cr-0.96 C (numbers indicate mass%) alloys with ferrite lamellar carbide and ferrite spheroidized carbide initial structures. The morphology of austenite formation in the range of 850 to 900°C has been examined in detail by transmission electron microscopy. The mechanisms of austenite nucleation and growth have been distinguished as they depend on the composition, starting microstructure and austenitizing temperature. The effects of both austenitising temperature in the range of 850 to 1150°C and a time on the M 23 C 6 and M 7 C 3 carbide evolution have also been investigated. Different morphologies of transformation products have been observed. The orientation relationships between ferrite, austenite and carbides were determined. The observed results can be explained by assuming local equilibrium at the moving interfaces during the reactions.