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Electron Beam Welding of Nimonic 80A Superalloy: Microstructure Evolution and EBSD Study After Aging Heat Treatment

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Abstract

The purpose of this research was to evaluate integrity and microstructure changes of the electron beam-welded Nimonic 80A and the base metal after aging heat treatment process, i.e., 700 °C/72 h/air cooling. Here, microstructure, microhardness and tensile were investigated by various tools, i.e., scanning electron microscope with energy-dispersive spectroscopy and electron backscatter diffraction, x-ray diffraction analysis and Vickers hardness. Evaluation of microstructure shows that the weld zone mainly consists of columnar dendrites. The effect of aging heat treatment on the microstructure morphology and phase structure is very limited. Also, it was observed that there are obvious segregation and precipitates in intracrystalline and along the grain boundaries after aging heat treatment. Electron backscatter diffraction results show that the weld zone and base metal have a clear difference in the grain boundary characterization and kernel average misorientation at room temperature and after aging heat treatment, which leads to a difference in microhardness of the weld zone. In addition, the relationship between microhardness and tensile strength is discussed.

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Acknowledgments

This work was supported by the National Natural Science Research Foundation of China (11327801, 11502151, 11772209 and 11572057), the Program for Changjiang Scholars and Innovative Research Team (IRT14R37), the Key Science and Technology Support Program of Sichuan Province (2015JPT0001) and supported by the fund of State Key Laboratory of Long-life High Temperature Materials.

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Authors and Affiliations

  1. Failure Mechanics and Engineering Disaster Prevention and Mitigation Key Laboratory of Sichuan Province, College of Architecture and Environment, Sichuan University, Chengdu, 610065, China

    Hong Zhang, Peidong Li, Qingyuan Wang & Yongjie Liu

  2. Key Laboratory of Deep Underground Science and Engineering, Ministry of Education, Sichuan University, Chengdu, 610065, China

    Hong Zhang, Peidong Li, Qingyuan Wang & Yongjie Liu

  3. School of Architecture and Civil Engineering, Chengdu University, Chengdu, 610106, China

    Qingyuan Wang

  4. State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu, 610065, China

    Qingyuan Wang

  5. School of Mechanical Engineering, Chengdu University, Chengdu, 610106, China

    Zhongwei Guan

  6. State Key Laboratory of Long-Life High Temperature Materials, DongFang Turbine Co., LTD, Deyang, 618000, Sichuan, China

    Xiufang Gong

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  1. Hong Zhang
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  2. Peidong Li
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Correspondence to Hong Zhang.

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Zhang, H., Li, P., Wang, Q. et al. Electron Beam Welding of Nimonic 80A Superalloy: Microstructure Evolution and EBSD Study After Aging Heat Treatment. J. of Materi Eng and Perform 28, 741–752 (2019). https://doi.org/10.1007/s11665-018-3817-5

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  • DOI: https://doi.org/10.1007/s11665-018-3817-5

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