| V、Ta微合金化12Cr低活性F/M钢的优化设计 |
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| 作者姓名： | 肖翔 刘国权 胡本芙 陈少静 |
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| 作者单位： | 1. 北京科技大学材料科学与工程学院, 北京 100083; |
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| 基金项目： | 国家重点基础研究发展计划（973计划） |
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| 摘 要： | 采用Thermo-Calc热力学模拟计算与实验相结合的方法,优化设计了一种V、Ta微合金化的低活性F/M钢12Cr3WVTa,经1 050℃水淬及780℃回火后对其显微组织及析出相进行光学显微镜、扫描电镜和透射电镜观察以及能谱分析.实验钢淬火回火后显微组织由回火马氏体和少量δ铁素体相组成,析出相主要为M23C6和MX相(M=V,Ta;X=C,N),其中M23C6主要分布于回火马氏体板条界和相界,而MX弥散析出于回火马氏体板条内以及δ铁素体内.实验钢室温和高温(600℃)拉伸力学性能良好,600℃下材料抗拉强度为507 MPa,屈服强度为402 MPa,满足超临界水冷堆用包壳管的拉伸性能要求.
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| 关 键 词： | 马氏体钢 铁素体钢 微合金化 显微组织 力学性能 水冷堆 |
| 收稿时间： | 2011-10-24 |
Optimization design of V,Ta microalloyed 12Cr low-activation F/M steel |
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| Affiliation: | 1. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China;2. State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China |
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| Abstract: | A low-activation F/M steel 12Cr3WVTa micro-alloyed with V and Ta was designed by Thermo-Calc thermodynamic simulation in combination with experimental methods. Its microstructure and precipitation after water quenching at 1 050℃ and then tempering at 780℃ were examined by means of optical microscopy (OM), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and energy dispersive spectrometry (EDS). The results show that the microstructure of the steel after quenching and tempering contains mainly tempered martensite with a small amount of δ-ferrite, as well as precipitates M23C6 and MX (M=V, Ta; X=C, N). M23C6 carbides distribute mainly along the lath boundaries and the phase interfaces, while MX precipitates within the tempered martensite and the δ-ferrite. The steel has good tensile properties at room temperature and high temperature (600℃), and its tensile strength and yield strength are 507 MPa and 402 MPa at 600℃, respectively, which meets the tensile property requirements of cladding tubes for supercritical water cooled reactors (SCWR). |
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