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Investigation of Microstructural Features Determining the Toughness of 980 MPa Bainitic Weld Metal

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Abstract

The microstructural features that control the impact toughness of weld metals of a 980 MPa 8 pct Ni high-strength steel are investigated using instrumented Charpy V tester, optical microscope (OM), scanning electron microscope (SEM), transmission electron microscope (TEM), electron back-scattered diffraction (EBSD), and finite-element method (FEM) calculation. The results show that the critical event for cleavage fracture in this high-strength steel and weld metals is the propagation of a bainite packet-sized crack across the packet boundary into contiguous packets, and the bainitic packet sizes control the impact toughness. The high-angle misorientation boundaries detected in a bainite packet by EBSD form fine tear ridges on fracture surfaces. However, they are not the decisive factors controlling the cleavage fracture. The effects of Ni content are essential factors for improving the toughness. The extra large cleavage facets seriously deteriorate the toughness, which are formed on the interfaces of large columnar crystals growing in welding pools with high heat input.

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Acknowledgments

This work was financially supported by the National Nature Science Foundation of China (Nos. 51035004 and 50905081).

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Authors and Affiliations

  1. State Key Laboratory of Gansu Advanced Non-ferrous Metallic Materials and Key Laboratory of Non-ferrous Metal Alloys of the Ministry of Education, Lanzhou University of Technology, Lanzhou, 730050, P.R. China

    R. Cao (Professor), Z. Wang (Master) & J. H. Chen (Professor)

  2. Department of Materials Science and Engineering, Shanghai Jiaotong University, Shanghai, 200240, P.R. China

    X. B. Zhang Doctor

  3. Central Iron and Steel Research Institute, Beijing, 100081, P.R. China

    Y. Peng (Professor), W. S. Du (Professor) & Z. L. Tian (Professor)

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  1. R. Cao
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  2. X. B. Zhang Doctor
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  3. Z. Wang
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  4. Y. Peng
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  5. W. S. Du
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  6. Z. L. Tian
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  7. J. H. Chen
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Corresponding author

Correspondence to J. H. Chen.

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Manuscript submitted February 5, 2013.

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Cao, R., Zhang, X.B., Wang, Z. et al. Investigation of Microstructural Features Determining the Toughness of 980 MPa Bainitic Weld Metal. Metall Mater Trans A 45, 815–834 (2014). https://doi.org/10.1007/s11661-013-2020-4

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  • DOI: https://doi.org/10.1007/s11661-013-2020-4

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