Creep properties of simulated heat-affected zone of HR3C austenitic steel

0480465 - ÚFM 2018 RIV US eng J - Článek v odborném periodiku
Sklenička, Václav - Kuchařová, Květa - Kvapilová, Marie - Svoboda, Milan - Král, Petr - Dvořák, Jiří
Creep properties of simulated heat-affected zone of HR3C austenitic steel.
Materials Characterization. Roč. 128, JUN (2017), s. 238-247. ISSN 1044-5803. E-ISSN 1873-4189
Grant CEP: GA MŠMT(CZ) LQ1601
Institucionální podpora: RVO:68081723
Klíčová slova: HR3C steel * Welding * Heat affected zone * Creep * Microstructure * Fractography
Obor OECD: Materials engineering
Impakt faktor: 2.892, rok: 2017

Tensile creep tests on austenitic stainless HR3C steel pipe in an as-received state and after heat affected zone
(HAZ) thermal cycle simulation by means of the GLEEBLE 3800 physical simulator were carried out at 923 and
1023 K and an applied stress range between 100 and 350 MPa to evaluate the effect of welding on its creep
properties and behaviour. It was found that creep testing was conducted in a power-law creep regime. The
results show a clear detrimental influence of the HAZ simulation on creep properties of HR3C steel at 923 K and
for very short creep exposure. However, with increasing time to fracture, the effect of weld simulation becomes
less significant. By contrast, no such deterioration of creep properties was detected at 1023 K. The evaluated
similar values of the stress exponents of the minimum creep rate and the time to fracture are explained using the
assumption that both creep deformation and the fracture process are controlled by the same mechanism. The
main creep fracture mode was intergranular brittle fracture due to grain boundary creep damage.
Trvalý link: http://hdl.handle.net/11104/0276288