| 2.25Cr-1.6W（T23）铁素体耐热钢服役过程中的组织演变研究 |
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| 引用本文： | 聂铭,于在松,周荣灿.2.25Cr-1.6W（T23）铁素体耐热钢服役过程中的组织演变研究[J].压力容器,2011,28(6):1-4,54. |
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| 作者姓名： | 聂铭 于在松 周荣灿 |
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| 作者单位： | 1. 广东电网公司电力科学研究院,广东广州,510600
2. 西安热工研究院有限公司,陕西西安,710032 |
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| 摘 要： | 通过OM,TEM,SEM和EDS等方法对正火态、供货态、高温服役老化T23试样的微观组织演变进行了分析,探讨了T23中碳化物的演化规律及对性能的影响。结果表明,在长期高温高压运行后,T23钢贝氏体铁素体基体和小岛中的马氏体将发生回复,晶内小颗粒M23C6型碳化物逐渐消失,大颗粒M23C6型碳化物在晶界聚集、长大,随着运行温度的升高和服役时间的延长,M23C6型碳化物逐渐转变为富W的M6C型碳化物;研究指出了大颗粒碳化物沿晶界聚集长大并呈链状分布,尤其是富W的M6C相的大量出现是性能发生退化的主要原因。
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| 关 键 词： | T23钢 微观组织演变规律 碳化物 性能退化 |
Investigation of Microstructure Evolution Law of 2.25Cr - 1.6W ( T23 ) Ferrite Steel |
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| NIE Ming,YU Zai-song,ZHOU Rong-can.Investigation of Microstructure Evolution Law of 2.25Cr - 1.6W ( T23 ) Ferrite Steel[J].Pressure Vessel Technology,2011,28(6):1-4,54. |
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| Authors: | NIE Ming YU Zai-song ZHOU Rong-can |
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| Affiliation: | 1.Guangdong Power Test and Research Institute,Guangzhou 510600,China;2.Xi′an Thermal Power Research Institute Co.,Ltd.,Xi′an 710032,China) |
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| Abstract: | The microstructure evolution law of T23 steels after long time service have been investigated by means of OM,TEM,SEM and EDS to find the relationship of carbide evolution law and performance degradation of T23 steel.The results showed that：after high temperature service,it was found that the bainitic ferrite matrix and the martensite in the carbon—rich islands would be recovered,M23C6 crabides would become coarser and gradually transformed into M6C as T23 steel service at high temperature longer time.It was also informed that bulky grain carbide（especially rich in W type carbide of M6C） distributed along the boundary of crystals is one of key reasons for abruptly degradation of the creep rupture strength about aged T23. |
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| Keywords: | T23 steel microstructure evolution law carbide degradation |
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