Czasopismo
Tytuł artykułu
Warianty tytułu
Konferencja
Międzynarodowe Sympozjum: Metody oceny struktury oraz własności materiałów i wyrobów (XXIII ; 22-24.10.2008 ; Jarnołtówek, Polska)
Języki publikacji
Abstrakty
Hydrogen embrittlement mechanisms of two very high strength steels (VHSS) with ultimate tensile strength reaching 1000 MPa were studied in severe hydrogen charging conditions. These VHSS were a TRIP steel (A) and a Cr-V alloyed high strength steel (B). They were submitted to cathodic charging in a sulfuric acid solution (0.1 N) with an addition of 5 nig L-1 of As2O3 as a promoter of hydrogen absorption. Electrochemical permeation technique and subsequent hydrogen dosage by thermal desorption tests provided values for hydrogen diffusion characteristics. A and B present diffusivity of respectively 2.6 10-11 nr s-1 and 2.2 10-10 m2 s-1. Blistering occurred at high charging currents, but residual hydrogen content appeared to be very low for both steels. The results can be attributed to the fine homogeneous microstructures with very few lattice defects like inclusions, impurities or microcracks that are the most potential sites for hydrogen trapping. Otherwise, tensile tests performed on hydrogenated steels showed higher loss of ductility in the presence of arsenic. Fracture surface observations suggest brittle fractures: transgranular brittle fracture for the steel A and intergranular brittle fracture for the steel B. Diffusible hydrogen is to be incriminated in the loss of plasticity since diffusion to crack tips is rather easy in these steels. All the results highlight the role of As2O3 in enhancing the steels susceptibility to hydrogen embrittlement.
Słowa kluczowe
Rocznik
Tom
Strony
59-60
Opis fizyczny
Bibliogr. 8 poz.
Twórcy
autor
autor
autor
autor
autor
- Faculty of Metallurgy and Materials Engineering, VSB - Technical University of Ostrava. 708 33 Ostrava, Czech Republic
Bibliografia
- [1] GU J.L., CHANG K.D., FANG H.S., BAI B.Z.: Delayed fracture Properties of 1500 MPa Bainite/Martensite Dual-Phase High strength steel and its hydrogen traps, Iron and Steel Institute of Japan International, Vol 42, (2002), 1560-1564.
- [2] TOMOHIKO H. et al.: Hydrogen embrittlement of Ultra high Strength Low Alloy TRIPaidedsteels, Journal of the Iron and Steel Institute of Japan, Vol 90, N°3( 2006), 177-182.
- [3] LY C., JÉRÔME M., GUILLOT J-B, SOJKA J., RUSCASSIER N., Hydrogen embrittlement of very high strength steels and influence of the microstructure, Proc. Eurocorr 2007, Freiburg in Bresgau, Germany, (2007), 11 p. CD.
- [4] ZHANG Y., MA Y., KANG Y., HAO L.: Mechanical properties and microstructure of TRIP steels produced using TSCR process, Journal of university of science and technology Beijing, Vol 13, N°5 (2006), 416-419.
- [5] DEVANATHAN M.A.V., STACHURSKI Z., Proceedings of the Royal Society, London, (1962), 90-102.
- [6] MANOLATOS P., JÉRÔME M.: A thin palladium coating for hydrogen permeation studies, Electrochimica Acta, Vol 41, N°3, (1996), 359-365.
- [7] McBREEN J., NANIS L., BECK W., Journal of the Electrochemical Society,Vol 113, (1966), 1218.
- [8] NANIS L., GOVINDAN NAMBOODHIRI T.K., Journal of the Electrochemical Society, Vol 119, (1972), 69.
Typ dokumentu
Bibliografia
Identyfikatory
Identyfikator YADDA
bwmeta1.element.baztech-article-BPOB-0029-0027