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首页> 外文期刊>Journal of Materials Research >Microstructural characterization and wide temperature range mechanical properties of NiCrMoV steel welded joint with heavy section
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Microstructural characterization and wide temperature range mechanical properties of NiCrMoV steel welded joint with heavy section

机译：大截面NiCrMoV钢焊接接头的显微组织表征和宽温度范围的力学性能

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摘要

NiCrMoV steels used in nuclear rotor with heavy section were successfully fabricated by ultra-narrow gap submerged arc welding method. In this study, the mechanical properties including the tensile and impact toughness of the welded joints (WJs) with a wide temperature range were systematically investigated. Microstructural characterization indicated that the high-temperature tempered martensite and tempered bainite, as the main microstructure in WJ, were responsible for the improved comprehensive mechanical properties of the WJ. Microhardness across the WJ was measured as well, showing that the highest value of hardness occurred at the heat-affected zone which represents the appropriate lowest impact toughness of WJ. However, compared with the base metal, the ultimate tensile strength of the WJ displayed approximately equivalent values, while the yield strength was increased with increasing temperature. All the fracture of the WJ specimens occurred on the weld metal. In addition, the Charpy impact energy of weld metal was obtained at various temperatures, and the transition temperature (Tt) of welded metal was determined as 5 ℃, which helps for the application design. The fractography indicated that the ductile fracture modes changed to quasi-cleavage ones gradually with decreasing temperature, and also the dimples became smaller and shallower.
机译：采用超窄缝埋弧焊方法成功地制造了大截面核转子用NiCrMoV钢。在这项研究中，系统地研究了在宽温度范围内的机械性能，包括焊接接头的拉伸强度和冲击韧性。显微组织表征表明，高温回火马氏体和贝氏体回火是WJ的主要显微组织，是改善WJ综合力学性能的原因。还测量了WJ的显微硬度，显示出最高的硬度值出现在热影响区，这代表WJ的最低最低冲击韧性。但是，与贱金属相比，WJ的极限抗拉强度显示出大致相等的值，而屈服强度随温度的升高而增加。 WJ试样的所有断裂都发生在焊接金属上。另外，在不同温度下获得了焊缝金属的夏比冲击能，确定了焊缝的转变温度（Tt）为5℃，有助于应用设计。断口扫描结果表明，随着温度的降低，韧性断裂模式逐渐转变为准断裂模式，并且凹坑变小，变浅。

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  • 来源
    《Journal of Materials Research》 |2015年第13期|2108-2116|共9页
  • 作者

    Fenggui Lu; Xia Liu; Peng Wang; Qingjun Wu; Haichao Cui; Xin Huo;

  • 作者单位

    Shanghai Key Laboratory of Materials Laser Processing and Modification, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China;

    Shanghai Turbine Plant of Shanghai Electric Power Generation Equipment Co. Ltd., Shanghai 200240, People's Republic of China Department of Mechanical Engineering, Tsinghua University, Beijing 100084, People's Republic of China;

    Shanghai Key Laboratory of Materials Laser Processing and Modification, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China Shanghai Turbine Plant of Shanghai Electric Power Generation Equipment Co. Ltd., Shanghai 200240, People's Republic of China;

    Shanghai Key Laboratory of Materials Laser Processing and Modification, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China;

    Shanghai Key Laboratory of Materials Laser Processing and Modification, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China;

    Shanghai Turbine Plant of Shanghai Electric Power Generation Equipment Co. Ltd., Shanghai 200240, People's Republic of 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);
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