摘要
面向新型可再生太阳能塔式熔盐光热发电吸热器对GH3625合金无缝管材规格和性能的需求,针对热挤压技术制备GH3625合金无缝管材周期长、能耗高等缺点以及难以生产出大长径比荒管的问题,本研究采用深钻孔法替代传统热挤压法制备GH3625合金荒管,随后经多道次冷轧及中间退火制备出Φ46 mm×4 mm×3000 mm和Φ44.45 mm×1.32 mm×9000 mm两种规格的GH3625合金无缝管材。EBSD分析发现,深钻孔法制备的两种规格的成品GH3625合金无缝管材的晶粒尺寸与传统热挤压技术相当,并且合金组织中含有大量的退火孪晶界细化晶粒;此外,力学性能测试结果表明,深钻孔法制备的两种规格的成品GH3625合金室温和高温性能与传统热挤压技术相当,且室温力学性能都达到了ASME SB-444-2021标准要求:抗拉强度≥690 MPa,屈服强度≥276 MPa,断后伸长率≥30%。
Aiming at the requirements for specifications and performance of GH3625 alloy seamless tubes used in novel renewable solar tower-type molten salt photothermal power generation absorbers,and addressing the shortcomings of the traditional hot extrusion technology—such as long production cycles,high energy consumption,and difficulties in producing billets with large length-to-diameter ratios—this study adopts the deep drilling method to replace traditional hot extrusion for preparing GH3625 alloy billets.Subsequently,Φ46 mm×4 mm×3000 mm andΦ44.45 mm×1.32 mm×9000 mm GH3625 alloy seamless tubes are manufactured through multi-pass cold rolling and intermediate annealing.EBSD analysis reveals that the grain size of the finished GH3625 alloy seamless tubes prepared by the deep drilling method is comparable to that of tubes produced by traditional hot extrusion technology.Moreover,the alloy microstructure contains a large number of annealing twin boundaries,which refine the grains.In addition,mechanical property test results indicate that the room-temperature and high-temperature properties of the finished GH3625 alloy tubes prepared by the deep drilling method are equivalent to those of tubes made by traditional hot extrusion technology.The room-temperature mechanical properties of both specifications meet the requirements of the ASME SB-444-2021 standard:tensile strength≥690 MPa,yield strength≥276 MPa,and elongation after fracture≥30%.
作者
樊昱
甄炳
高钰璧
赵多平
丁雨田
FAN Yu;ZHEN Bing;GAO Yubi;ZHAO Duoping;DING Yutian(National Key Laboratory of Ni&Co Associated Minerals Resources Development and Comprehensive Utilization,Jinchuan Group Ltd.,Jinchang 737100,Gansu,China;School of Materials Science and Engineering,Lanzhou University of Technology,Lanzhou 730050,China;State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals,Lanzhou University of Technology,Lanzhou 730050,China)
出处
《材料工程》
北大核心
2026年第3期131-143,共13页
Journal of Materials Engineering
基金
甘肃省国资委关键核心技术攻关项目(2023GZ007)
甘肃省教育厅青年博士支持项目(2025QB-022)
2023兰州理工大学红柳优秀青年人才支持计划(01/062311)。
