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V、Ta微合金化12Cr低活性F/M鋼的優化設計

Optimization design of V,Ta microalloyed 12Cr low-activation F/M steel

  • 摘要: 采用Thermo-Calc熱力學模擬計算與實驗相結合的方法,優化設計了一種V、Ta微合金化的低活性F/M鋼12Cr3WVTa,經1 050℃水淬及780℃回火后對其顯微組織及析出相進行光學顯微鏡、掃描電鏡和透射電鏡觀察以及能譜分析.實驗鋼淬火回火后顯微組織由回火馬氏體和少量δ鐵素體相組成,析出相主要為M23C6和MX相(M=V,Ta;X=C,N),其中M23C6主要分布于回火馬氏體板條界和相界,而MX彌散析出于回火馬氏體板條內以及δ鐵素體內.實驗鋼室溫和高溫(600℃)拉伸力學性能良好,600℃下材料抗拉強度為507 MPa,屈服強度為402 MPa,滿足超臨界水冷堆用包殼管的拉伸性能要求.

     

    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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