The Effect of Electrolytic Hydrogenation on Mechanical Properties of T92 Steel Weldments under Different PWHT Conditions

0541338 - ÚFM 2022 RIV CH eng J - Článek v odborném periodiku
Čiripová, L. - Falat, L. - Homolová, V. - Džupon, M. - Džunda, R. - Dlouhý, Ivo
The Effect of Electrolytic Hydrogenation on Mechanical Properties of T92 Steel Weldments under Different PWHT Conditions.
Materials. Roč. 13, č. 16 (2020), č. článku 3653. E-ISSN 1996-1944
Institucionální podpora: RVO:68081723
Klíčová slova: postweld heat-treatment * iv cracking behavior * creep-rupture * welded-joints * affected zone * p91 steel * microstructure * evolution * performance * grade 92 steel weldment * post-welding heat treatment * tensile straining * hydrogen embrittlement * metallography and fractography
Obor OECD: Materials engineering
Impakt faktor: 3.623, rok: 2020
Způsob publikování: Open access
https://www.mdpi.com/1996-1944/13/16/3653

In the present work, the effects of electrolytic hydrogen charging of T92 steel weldments on their room-temperature tensile properties were investigated. Two circumferential weldments between the T92 grade tubes were produced by gas tungsten arc welding using the matching Thermanit MTS 616 filler material. The produced weldments were individually subjected to considerably differing post-welding heat treatment (PWHT) procedures. The first-produced weldment was conventionally tempered (i.e., short-term annealed below the Ac(1)critical transformation temperature of the T92 steel), whereas the second one was subjected to its full renormalization (i.e., appropriate reaustenitization well above the T92 steel Ac(3)critical transformation temperature and subsequent air cooling), followed by its conventional subcritical tempering. From both weldments, cylindrical tensile specimens of cross-weld configuration were machined. The room-temperature tensile tests were performed for the individual welds' PWHT states in both hydrogen-free and electrolytically hydrogen-charged conditions. The results indicated higher hydrogen embrittlement susceptibility for the renormalized-and-tempered weldments, compared to the conventionally tempered ones. The obtained findings were correlated with performed microstructural and fractographic observations.
Trvalý link: http://hdl.handle.net/11104/0319651