Microstructures and Mechanical Properties of a Newly Developed Austenitic Heat Resistant Steel

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英文篇名：Microstructures and Mechanical Properties of a Newly Developed Austenitic Heat Resistant Steel 作者：Peng ; Liu ; Zhao-Kuang ; Chu ; Yong ; Yuan ; Dao-Hong ; Wang ; Chuan-Yong ; Cui ; Gui-Chen ; Hou ; Yi-Zhou ; Zhou ; Xiao-Feng ; Sun 英文作者：Peng Liu;Zhao-Kuang Chu;Yong Yuan;Dao-Hong Wang;Chuan-Yong Cui;Gui-Chen Hou;Yi-Zhou Zhou;Xiao-Feng Sun;Institute of Metal Research,Chinese Academy of Sciences;School of Materials Science and Engineering,University of Science and Technology of China;Xi'an Thermal Power Research Institute Co.Ltd.;Jiangsu Feiyue Pump Group Co.Ltd.; 英文关键词：Austenitic heat resistant steel;;Microstructure;;Mechanical property;;Fracture mode 中文刊名：Acta Metallurgica Sinica(English Letters) 英文刊名：金属学报(英文版) 机构：Institute of Metal Research,Chinese Academy of Sciences;School of Materials Science and Engineering,University of Science and Technology of China;Xi'an Thermal Power Research Institute Co.Ltd.;Jiangsu Feiyue Pump Group Co.Ltd.; 出版日期：2019-04-15 出版单位：Acta Metallurgica Sinica(English Letters) 年：2019 期：04 基金：supported financially by the National Natural Science Foundation of China (Nos. 11332010,51671189 and 51701210);; the Project from China Huaneng Group Co. Ltd. (No. ZD-15-HJK02) 语种：英文; 页：107-115 页数：9 CN：21-1361/TG ISSN：1006-7191 分类号：TG142.73

摘要

The effect of heat treatment on the microstructures and mechanical properties of a newly developed austenitic heat resistant steel(named as T8 alloy) for ultra-supercritical applications have been studied. Results show that the main phases in the alloy after solution treatment are γ and primary MX. Subsequent aging treatment causes the precipitation of M_(23)C_6 carbides along the grain boundaries and a small number of nanoscale MX inside the grains. In addition, with increasing the aging temperature and time, the morphology of M_(23)C_6 carbides changes from semi-continuous chain to continuous network.Compared with a commercial HR3C alloy, T8 alloy has comparable tensile strength, but higher stress rupture strength. The dominant cracking mechanism of the alloy during tensile test at room temperature is transgranular, while at high temperature, intergranular cracking becomes the main cracking mode, which may be caused by the precipitation of continuous M_(23)C_6 carbides along the grain boundaries. Typical intergranular cracking is the dominant cracking mode of the alloy at all stress rupture tests.
        The effect of heat treatment on the microstructures and mechanical properties of a newly developed austenitic heat resistant steel(named as T8 alloy) for ultra-supercritical applications have been studied. Results show that the main phases in the alloy after solution treatment are γ and primary MX. Subsequent aging treatment causes the precipitation of M_(23)C_6 carbides along the grain boundaries and a small number of nanoscale MX inside the grains. In addition, with increasing the aging temperature and time, the morphology of M_(23)C_6 carbides changes from semi-continuous chain to continuous network.Compared with a commercial HR3C alloy, T8 alloy has comparable tensile strength, but higher stress rupture strength. The dominant cracking mechanism of the alloy during tensile test at room temperature is transgranular, while at high temperature, intergranular cracking becomes the main cracking mode, which may be caused by the precipitation of continuous M_(23)C_6 carbides along the grain boundaries. Typical intergranular cracking is the dominant cracking mode of the alloy at all stress rupture tests.

引文

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