Structure and mechanism of formation of dissimilar welded joints in nuclear power plant made of austenitic and pearlitic steels

Khodakov, V. D.; Khodakov, D.V.

doi:10.1080/09507116.2016.1157331

Cited by 5 publications

(1 citation statement)

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“…In particular, in welded joints of dissimilar steels on different sides of the fusion line, decarburized interlayers and interlayers with increased carbide content may be observed [2,3]. Decarburized and carbide interlayers are typical for dissimilar welded joints of low-alloy pearlitic steels to chromium-nickel austenitic steels [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Features of Acoustic Emission in Tensile Testing of Dissimilar Welded Joints of Pearlitic and Austenitic Steels

et al. 2021

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This paper presents a study of acoustic emission (AE) during the deformation of dissimilar welded joints of austenitic steel to pearlitic steel. One of the specific problems in these welded joints is the presence of decarburized and carbide diffusion interlayers, which intensively increase in width during long-term high-temperature operation. The presence of wide interlayers negatively affects the mechanical properties of welded joints. Moreover, welded defects are difficult to diagnose in welded joints containing interlayers: due to the high structural heterogeneity, interlayers create structural noises that can hinder the detection of defects such as cracks, pores, or a lack of penetration. The AE method may become a complex decision for diagnosing dissimilar welded joints due to applicability to the testing of heterogenic materials with a complex microstructure. Specimens cut from dissimilar welded joints of austenitic steel to pearlitic steel were tested by tension to rupture, with parallel AE data registration. According to the research results, the characteristic features of the AE were revealed for specimens containing defects in the form of lack of penetration as well as for specimens with diffusion interlayers. The results obtained show that the AE method can be used to test both typical welding defects and diffusion interlayers in welded joints of steels of different structural classes.

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Section: Introductionmentioning

confidence: 99%