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Study of Residual Stresses and Microstructural Changes in Charpy Test Specimens Reconstituted by Various Welding Techniques

1
Frank Laboratory of Neutron Physics, Joint Institute for Nuclear Research, Joliot-Curie Str. 6, 141980 Dubna, Russia
2
Institute of Electronics of Bulgarian Academy of Sciences, 72 Tzarigradsko Chaussee, 1784 Sofia, Bulgaria
*
Author to whom correspondence should be addressed.
Metals 2020, 10(5), 632; https://doi.org/10.3390/met10050632
Received: 24 April 2020 / Revised: 7 May 2020 / Accepted: 11 May 2020 / Published: 12 May 2020
Changes in the reactor pressure vessel (RPV) material properties due to neutron irradiation are monitored by means of surveillance specimen programs, which are used for realistic evaluation of the RPVs’ lifetime. Due to a limited number of surveillance specimens, the evaluation of reconstitution methods by various welding techniques after Charpy impact tests is of great importance. Time-of-flight (TOF) neutron diffraction method was used to determine the residual stress distributions and microstructural changes in Charpy specimens welded by arc stud, electron, and laser beam welding techniques. The lowest level of the residual stress in weld seams regions was found for the specimen welded by electron beam with optimal parameters as compared to other techniques. At the same time, this specimen exhibits the maximal level of microstrain, which points to high dislocation density in the material. The corresponding contributions to the yield strength due to various strengthening mechanisms were estimated. View Full-Text
Keywords: surveillance Charpy specimens; reconstitution technique; beam welding; neutron diffraction; residual stress; microstrain surveillance Charpy specimens; reconstitution technique; beam welding; neutron diffraction; residual stress; microstrain
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Bokuchava, G.; Petrov, P. Study of Residual Stresses and Microstructural Changes in Charpy Test Specimens Reconstituted by Various Welding Techniques. Metals 2020, 10, 632.

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