| 25-12型奥氏体耐热铸钢长期服役过程中碳化物的演变现象 |
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| 引用本文： | 刘江文,罗承萍,肖晓玲,陈和兴.25-12型奥氏体耐热铸钢长期服役过程中碳化物的演变现象[J].金属学报,2002,38(2):127-130. |
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| 作者姓名： | 刘江文 罗承萍 肖晓玲 陈和兴 |
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| 作者单位： | 1. 华南理工大学机电工程系,广州,510641
2. 广州有色金属研究院,广州,510650 |
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| 基金项目： | 广东省自然科学基金980494资助项目 |
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| 摘 要： | N，Nb和RE微合金化的25－12型奥氏体耐热铸钢长期使用后，奥氏体中析出的二次碳化物数量明显增加，晶界附近无析出区现象逐渐消失；部分M23C6已转变为M6C，M6C总是与奥氏体基体以及二次碳化物M23C6保持114]M6C//110]A//110]M23C6孪晶取向关系，探讨了合金元素及服役条件对碳化物演变的影响。
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| 关 键 词： | 奥氏体耐热钢 显微组织 碳化物 取向关系 铸钢 |
| 文章编号： | 0412-1961(2002)02-0127-04 |
| 修稿时间： | 2001年6月15日 |
EVOLUTION OF CARBIDE IN 25-12 AUSTENITIC HEATRESISTANT CAST STEEL DURING SERVICE |
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| LIU jiangwen,LUO Chengping,XIAO Xiaoling.EVOLUTION OF CARBIDE IN 25-12 AUSTENITIC HEATRESISTANT CAST STEEL DURING SERVICE[J].Acta Metallurgica Sinica,2002,38(2):127-130. |
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| Authors: | LIU jiangwen LUO Chengping XIAO Xiaoling |
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| Abstract: | Evolution of the microstructure of 25-12 austenitic heat-resistant cast steel with minor additions of N, Nb and RE during service for a long time was investigated by using TEM and optical microscope. The results indicate that the amount of secondary carbide M23C6 precipited in custenite obviously increased and the precipitate free zone (PFZ) near the grain boundary disappeared. Some M23C6 transformed into M6C, which always kept 114]M6c//11O] A//110]M23c6 twin orientation relationship with austenite and M23C6 secondary carbide. The effects of alloy elements and service condition upon the carbide evolution in the steel were discussed. |
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| Keywords: | austenitic heat-resistant steel microstructure carbide orientation relationship |
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