Abstract
The dependency of Charpy impact value (E v) of SUS304L submerged arc weldment on test temperature and the angle (θ) between columnar structure and specimen has been studied. The distribution ofE v in the weldment was also measured. The results were summarized as follows. (1) The impact value scarcely depends on the angleθ. (2)E v of the weld metal decreases with decreasing the test temperature because the brittle fracture occurred along toδ ferrite. (3)E v indicated a minimum value at the weld metal and increased drastically at the fusion boundary and reached a high value at the base metal. The variation ofE v corresponds to the distribution of oxide inclusion and the change of morphology ofδ ferrite. (4) At low temperature, globular typeδ ferrite causes fine dimples, a discontinuousδ ferrite network causes large dimples, and continuousδ ferrite easily leads to brittle fracture along toδ.
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Kamiya, O., Kumagai, K. Effect of microstructure on impact fracture behaviour of SUS304L SAW joint at low temperature. J Mater Sci 25, 2017–2024 (1990). https://doi.org/10.1007/BF01045758
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DOI: https://doi.org/10.1007/BF01045758