程书豪,赵新宝,谷月峰,严靖博,袁勇,岳全召,张泽

• 1:浙江大学材料科学与工程学院高温合金研究所
• 2:浙江大学工程师学院
• 3:西安热工研究院有限公司

摘要(Abstract)：

高性能的镍基变形高温合金是先进超超临界电站末级过/再热器的重要制备材料，在长期的服役过程中组织和性能会发生老化和衰减。对不同服役时间的HT700T合金过热器管的显微组织和力学性能进行了测试和分析。结果表明：随服役时间的延长，HT700T合金的晶粒略微长大，晶界碳化物M_(23)C_6发生粗化，服役11000 h后晶内析出均匀分布的球形γ′相，γ′相的沉淀强化提高了合金的显微硬度；HT700T合金试样在初始态和服役500 h后的室温和高温屈服强度变化较小，抗拉强度随服役时间的延长有所降低；γ′相的析出强化显著增强了服役11000 h后合金的屈服强度，伸长率较低主要是晶界碳化物M_(23)C_6的粗化导致；服役11000 h后的合金的室温和高温冲击吸收能量下降显著，这主要是由于长时服役后晶界碳化物M_(23)C_6发生粗化造成晶界强度减弱，进而导致其冲击吸收能量均较低。

关键词(KeyWords)： HT700T合金;700℃先进超超临界电站;组织演变;拉伸性能;冲击韧性

Abstract:

Keywords:

基金项目(Foundation): 华能集团科技项目(HNKJ20-H41)

作者(Author): 程书豪,赵新宝,谷月峰,严靖博,袁勇,岳全召,张泽

DOI: 10.13289/j.issn.1009-6264.2024-0410

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