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    袁勇, 党莹樱, 杨珍, 张鹏, 尹宏飞, 黄锦阳, 周永莉, 严靖博, 鲁金涛, 谷月峰, 赵海平, 王婷婷, 徐松乾. 700℃先进超超临界机组末级过热器用新型镍铁基高温合金的组织与性能[J]. 机械工程材料, 2020, 44(1): 44-50. DOI: 10.11973/jxgccl202001008
    引用本文: 袁勇, 党莹樱, 杨珍, 张鹏, 尹宏飞, 黄锦阳, 周永莉, 严靖博, 鲁金涛, 谷月峰, 赵海平, 王婷婷, 徐松乾. 700℃先进超超临界机组末级过热器用新型镍铁基高温合金的组织与性能[J]. 机械工程材料, 2020, 44(1): 44-50. DOI: 10.11973/jxgccl202001008
    shu
    YUAN Yong, DANG Yingying, YANG Zhen, ZHANG Peng, YIN Hongfei, HUANG Jinyang, ZHOU Yongli, YAN Jingbo, LU Jintao, GU Yuefeng, ZHAO Haiping, WANG Tingting, XU Songqian. Microstructure and Properties of Ni-Fe-base Superalloy for 700 ℃ Advanced Ultra Supercritical Unit Final Superheater[J]. Materials and Mechanical Engineering, 2020, 44(1): 44-50. DOI: 10.11973/jxgccl202001008
    Citation: YUAN Yong, DANG Yingying, YANG Zhen, ZHANG Peng, YIN Hongfei, HUANG Jinyang, ZHOU Yongli, YAN Jingbo, LU Jintao, GU Yuefeng, ZHAO Haiping, WANG Tingting, XU Songqian. Microstructure and Properties of Ni-Fe-base Superalloy for 700 ℃ Advanced Ultra Supercritical Unit Final Superheater[J]. Materials and Mechanical Engineering, 2020, 44(1): 44-50. DOI: 10.11973/jxgccl202001008
    shu

    700℃先进超超临界机组末级过热器用新型镍铁基高温合金的组织与性能

    Microstructure and Properties of Ni-Fe-base Superalloy for 700 ℃ Advanced Ultra Supercritical Unit Final Superheater

      摘要
    • 摘要: 研究了700 ℃先进超超临界（A-USC）机组末级过热器用新型镍铁基HT700T高温合金的组织和性能。结果表明：HT700T合金为析出强化型合金，在750 ℃的组织稳定性较好；合金在750 ℃时的屈服强度为598 MPa，且热暴露3 000 h后其屈服强度仍约为400 MPa；合金在750 ℃/105 h的持久强度为103 MPa；在750 ℃热暴露104 h后，室温冲击功为50 J·cm-2，较热暴露前的略有下降；合金的750 ℃抗蒸汽氧化性能达到完全抗氧化级，在750 ℃/2×105 h模拟烟灰/烟气条件下的金属腐蚀深度约为0.2 mm；HT700T合金的综合性能基本满足700 ℃ A-USC机组末级过热器的服役性能要求，其工业试制锅炉管已在试验平台上正常运行超过15 000 h。

       

      Abstract: The microstructure and properties of a new Ni-Fe-base HT700T superalloy for 700℃ A-USC unit final superheater were studied. The results show that HT700T alloy was a precipitation-hardening alloy, and the microstructure stability of HT700T alloy at 750℃ was stable. The yield strength at 750℃ was 598 MPa, and remained about 400 MPa after thermal exposure for 3 000 h. The creep rupture strength of the alloy at 750℃/105 h was 103 MPa. The impact energy at room temperature of the alloy after thermal exposure at 750℃ for 104 h was 50 J·cm-2, which was slightly lower than that before thermal exposure. The resistance to steam oxidation at 750℃ reached the complete oxidation resistance level, and the metal corrosion thickness in simulated flue gas and coal ash at 750℃/2×105 h was 0.2 mm. The comprehensive performance of HT700T alloy could basically meet the service performance requirements of 700℃ A-USC unit final superheater; the industrial manufactured alloy boiler tube had been running normally on the test platform for over 15 000 h.

       

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