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Characterization of Anisotropy of Strength in API-X80 Line Pipe Welds Through Instrumented Indentation

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Abstract

In this work, an instrumented indentation technique with a nearly flat tip indenter was used to measure the yield strength of API-X80 line pipe weld. Using this technique, the yield strength can be estimated directly from the indentation load–displacement response. The yield strength of the weld metal was measured in the transverse (hoop) and longitudinal (long) directions of the weld, and the results indicated that the weld metal exhibits anisotropy in terms of the yield strength by as much as 100 MPa, which could lead to a non-conservative estimate when strength mismatch is considered. Conventional tensile testing obtained strength values to within 4.6% of the indentation measurements and confirmed the results. Hardness maps also show a 20 HV0.5 difference in the two directions of the weld, which supports anisotropy of yield strength. The microstructure analysis using SEM reveals a slight difference in the grain size, which partially explains the differences in properties.

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Acknowledgment

The authors would like to acknowledge TransCanada Corp and the Natural Sciences and Engineering Research Council of Canada (NSERC) for their financial support. The authors also would like to acknowledge Mr. Jim Gianetto from CanmetMATERIALS and Natural Resources Canada for his help in performing the SEM analysis.

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Authors and Affiliations

  1. Center for Advanced Materials Joining (CAMJ), Department of Mechanical and Mechatronic Engineering, University of Waterloo, 200 University Avenue West, Waterloo, ON, N2L 3G1, Canada

    A. R. H. Midawi, N. Huda & A. P. Gerlich

  2. School of Engineering, University of Guelph, Guelph, ON, N1G 2W1, Canada

    C. H. M. Simha

  3. Mechanical Engineering Department, Faculty of Engineering, University of Benghazi, Benghazi, 21861, Libya

    A. R. H. Midawi

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  1. A. R. H. Midawi
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  2. N. Huda
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  3. C. H. M. Simha
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  4. A. P. Gerlich
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Correspondence to A. R. H. Midawi.

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Midawi, A.R.H., Huda, N., Simha, C.H.M. et al. Characterization of Anisotropy of Strength in API-X80 Line Pipe Welds Through Instrumented Indentation. Metallogr. Microstruct. Anal. 9, 884–894 (2020). https://doi.org/10.1007/s13632-020-00693-8

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  • DOI: https://doi.org/10.1007/s13632-020-00693-8

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