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首页> 外文期刊>Journal of Materials Research >Investigation of local brittle zone in multipass welded joint of NiCrMoV steel with heavy section
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Investigation of local brittle zone in multipass welded joint of NiCrMoV steel with heavy section

机译：NiCrMoV钢大截面多道次焊接接头局部脆性区的研究

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摘要

Welding was successfully used in the fabrication of low pressure steam turbine rotors for nuclear power plants. In this paper, the local brittle zone of the welded joint in NiCrMoV steel with heavy section was investigated by cross-zone fracture toughness test and the effect of martensite-austenite constituent in the simulated reheated zone of welds with different second peak temperature on toughness was analyzed. The results showed that the crack propagated in unstable manner in the reheated zone of welds where the martensite-austenite constituent promoted the initiation and propagation of the crack. The fine structure of martensite-austenite constituent contained retained austenite, martensite, and martensite-austenite mixture microstructure. The impact toughness deteriorated drastically in the incomplete phase transition zone for the simulated reheated zone of welds related to the formation of mixture microstructure in which large blocky martensite-austenite constituent at prior austenite grain boundaries and inside the grains were distributed in the shape of network.
机译：焊接成功地用于制造核电站的低压蒸汽轮机转子。本文通过跨区断裂韧性试验研究了大截面NiCrMoV钢焊接接头的局部脆性区，并模拟了第二二次峰值温度不同的焊缝再加热区中马氏体-奥氏体成分对韧性的影响。分析。结果表明，裂纹在马氏体-奥氏体成分促进裂纹萌生和扩展的焊缝再加热区中以不稳定的方式扩展。马氏体-奥氏体成分的精细结构包含残留的奥氏体，马氏体和马氏体-奥氏体混合物的微观结构。在模拟的再加热焊缝的不完全相变区中，冲击韧性急剧下降，这与混合微观结构的形成有关，在混合微观结构中，先前奥氏体晶界和晶粒内部的大块状马氏体-奥氏体成分以网状分布。

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  • 来源
    《Journal of Materials Research》 |2018年第8期|923-934|共12页
  • 作者

    Li Yifei; Cai Zhipeng; Li Kejian; Pan Jiluan; Liu Xia; Sun Lingen; Wang Peng;

  • 作者单位

    Tsinghua Univ, Dept Mech Engn, Beijing 100084, Peoples R China;

    Tsinghua Univ, Dept Mech Engn, Beijing 100084, Peoples R China;

    Tsinghua Univ, Dept Mech Engn, Beijing 100084, Peoples R China;

    Tsinghua Univ, Dept Mech Engn, Beijing 100084, Peoples R China;

    Tsinghua Univ, Dept Mech Engn, Beijing 100084, Peoples R China;

    Shanghai Elect Power Generat Equipment Co Ltd, Shanghai Turbine Plant, Technol Dev Dept, Shanghai 200240, Peoples R China;

    Shanghai Elect Power Generat Equipment Co Ltd, Shanghai Turbine Plant, Technol Dev Dept, Shanghai 200240, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
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