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首页> 外文期刊>Journal of Materials Research >Role of stress in the high cycle fatigue behavior of advanced 9Cr/CrMoV dissimilarly welded joint
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Role of stress in the high cycle fatigue behavior of advanced 9Cr/CrMoV dissimilarly welded joint

机译：应力在高级9Cr / CrMoV异种焊接接头的高周疲劳行为中的作用

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摘要

Narrow gap submerged arc welding method accompanied with multilayer and multipass technology was used to manufacture advanced 9Cr and CrMoV dissimilarly welded joint used as a newly developed turbine rotor. The aim of this investigation was to evaluate the high cycle fatigue (HCF) behavior of the welded joint at room temperature. Uniaxial-stress controlled HCF tests at stress ratio R = - 1 were performed with specimens chipped from the welded joint of mockup and the S-N curve up to 1.0 × 10~8 cycle lifetime was obtained. It was found that the fracture location transferred from heat affected zone (HAZ) of CrMoV side to weld metal (WM) with decreasing stress amplitude. The microstructure of the welded joint was characterized and microstructure diversity was found to be responsible for the failure locations both in the CrMoV-HAZ and WM. Fracture morphology of failure samples were also investigated by a scanning electron microscope. It is detected that the stress amplitude required to drive the inclusion to be the crack initiation of the CrMoV-HAZ lies behind the transition. With decreasing stress amplitudes, void in the WM more easily tends to be the initiation of a fatigue crack than inclusion.
机译：窄缝埋弧焊结合多层多道焊技术被用于制造先进的9Cr和CrMoV异种焊接接头，该接头被用作新开发的涡轮转子。这项研究的目的是评估室温下焊接接头的高周疲劳（HCF）行为。从样机的焊接接头上切下的试样进行了应力比R =-1的单轴应力控制HCF测试，并获得了高达1.0×10〜8循环寿命的S-N曲线。结果发现，随着应力振幅的减小，断裂位置从CrMoV侧的热影响区（HAZ）转移到焊接金属（WM）。表征了焊接接头的微观结构，发现微观结构的多样性是造成CrMoV-HAZ和WM失效位置的原因。还通过扫描电子显微镜研究了失效样品的断裂形态。已检测到驱动夹杂物成为CrMoV-HAZ的裂纹萌生所需的应力幅度位于过渡之后。随着应力幅度的减小，WM中的空隙比夹杂更容易引起疲劳裂纹。

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  • 来源
    《Journal of Materials Research》 |2016年第2期|292-301|共10页
  • 作者

    Chendong Shao; Fenggui Lu; Zhuguo Li; Yan Cai; Peng Wang; Yuming Ding;

  • 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,Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration, 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,Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration, 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,Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration, 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,Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration, 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;

    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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