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Investigation of local brittle zone in multipass welded joint of NiCrMoV steel with heavy section

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Abstract

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.

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ACKNOWLEDGMENT

The authors gratefully acknowledge the financial support by the National Natural Science Foundation of China under Grant No. 51775300.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Tsinghua University, Beijing, 100084, China

    Yifei Li, Zhipeng Cai, Kejian Li, Jiluan Pan & Xia Liu

  2. State Key Laboratory of Tribology, Tsinghua University, Beijing, 100084, China

    Zhipeng Cai

  3. Collaborative Innovation Center of Advanced Nuclear Energy Technology, Tsinghua University, Beijing, 100084, China

    Zhipeng Cai

  4. Shanghai Turbine Plant of Shanghai Electric Power Generation Equipment Co. Ltd., Shanghai, 200240, China

    Xia Liu

  5. Technology Development Department, Shanghai Turbine Plant of Shanghai Electric Power Generation Equipment Co. Ltd., Shanghai, 200240, China

    Lingen Sun & Peng Wang

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  1. Yifei Li
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Correspondence to Zhipeng Cai.

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Li, Y., Cai, Z., Li, K. et al. Investigation of local brittle zone in multipass welded joint of NiCrMoV steel with heavy section. Journal of Materials Research 33, 923–934 (2018). https://doi.org/10.1557/jmr.2017.467

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  • DOI: https://doi.org/10.1557/jmr.2017.467

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