Hydrogen degradation of high strength weldable steels

• Autorzy: Ćwiek J.
• Konferencja: 12th International Scientific Conference CAM3S'2006, 27-30th November 2006, Gliwice-Zakopane
• Języki publikacji: EN

Abstrakty

EN

Purpose: Purpose of this paper is presentation of hydrogen degradation issue of high strength steels and especially their welded joints. Establishing of applicable mechanisms of hydrogen-enhanced cracking was the aim of performed research. Design/methodology/approach: High strength quenched and tempered steels grade S690Q were used. Welded joints were prepared with typical technology used in shipyards. Susceptibility to hydrogen degradation in sea water under cathodic polarization was evaluated with the use of mechanical tests. Various kinds of loads were applied, i.e. monotonically increasing static, constant, and cyclic. Appropriate measures of hydrogen degradation were chosen and analyzed. Mechanisms of hydrogen degradation were detected and established on the basis of scanning electron microscopy (SEM) observation of fracture samples surface. Findings: Tested high strength steels and their welded joints are susceptible to hydrogen embrittlement when evaluated using a slow strain rate test (SSRT). On contrary, these steels and welded joints have high resistance to hydrogen delayed cracking under a constant load test. Significant reduction of a fatigue life time due to hydrogen absorption has been observed during severe low-cycle fatigue tests. Research limitations/implications: There is no possibility to perform direct observation of exact hydrogen-assisted cracking mechanisms in massive samples. Valid hydrogen-enhanced cracking model could be only deducted from degradation evidences like plasticity loss and fracture modes. Practical implications: Tested quenched and tempered S690Q steel grades could be safely utilized for marine welded constructions under cathodic polarization. Hydrogen-assisted cracking should not occur unless a huge overprotection and plastic deformation take place. Originality/value: Hydrogen-enhanced localized plasticity (HELP) model is the most applicable mechanism of hydrogen degradation for weldable steels with yield strength up to 1000 MPa.

Słowa kluczowe

EN

crack resistance; high strength steel; welded joints; hydrogen degradation

PL

odporność na pękanie; stal o dużej wytrzymałości; złącze spawane; niszczenie wodorowe

• Wydawca: International OCSCO World Press
• Czasopismo: Journal of Achievements in Materials and Manufacturing Engineering
• Rocznik: 2007
• Tom: Vol. 20, nr 1-2
• Strony: 223--226
• Opis fizyczny: Bibliogr. 21 poz., fot., rys., tab.

Twórcy

autor

Ćwiek J.

• Division of Faculty of Mechanical Engineering, Gdańsk University of Technology, ul. Narutowicza 11/12, 80-952 Gdańsk, Poland,

Bibliografia

• [1] J. Ćwiek, High strength weldable steels, Mechanical Review 9 (1996) 9-15 (in Polish).
• [2] J. Ćwiek, Hydrogen assisted cracking of high-strength weldable steels in sea-water, Journal of Materials Processing Technology 164-165 (2005) 1007-1013.
• [3] ASM Handbook. Vol. 11 Failure Analysis and Prevention. ASM Int., 1986.
• [4] N. Eliaz, A. Shachar, B. Tal, D. Eliezer, Characteristic of hydrogen embrittlement, stress corrosion cracking and tempered martensite embrittlement in high-strength steels, Engineering Failure Analysis 9 (2002) 176-184.
• [5] B. Świeczko-Żurek, S. Sobieszczyk, J. Ćwiek, A. Zieliński, Evaluation of susceptibility of high-strength steels to hydrogen delayed cracking, Journal of Achievements in Materials and Manufacturing Engineering 18 (2006) 243-246.
• [6] J. Ćwiek, A. Zieliński, Mechanism of hydrogen enhanced-cracking of high-strength steel welded joints, Journal of Achievements in Materials and Manufacturing Engineering 18 (2006)207-210.
• [7] S.P. Lynch, Failures of structures and components by environmentally assisted cracking, Engineering Failure Analysis 2 (1994) 77-90.
• [8] S. Sobieszczyk, E. Łunarska, J. Ćwiek, A. Zieliński, K. Nikiforow, Hydrogen charging of plasma nitrided steel in acid solution, Journal of Achievements in Materials and Manufacturing Engineering 17 (2006) 205-208.
• [9] A. Zieliński, J. Ćwiek, M. Błaszkiewicz, Effect of plasma nitrided layers on low-alloy steel on its hydrogen degradation, Journal of Achievements in Materials and Manufacturing Engineering 17 (2006) 213-216.
• [10] A. Zieliński, E. Łunarska, P. Michalak, W. Serbiński, Strength degradation of 26H2MF and 34HNM steels used in ship engines: hydrogen factor, Materials Science 6 (2004) 822-830.
• [11] J.V. Sharp, J. Billingham, M.J. Robinson, The risk of high-strength steels in jack-ups in seawater, Marine Structures 14 (2001) 537-551.
• [12] K. Banerjee, U.K. Chatterjee, Hydrogen embrittlement of a HSLA-100 steel in seawater, ISIJ International 1 (1999) 47-55.
• [13] R.A. Oriani, J.P. Hirth, M. Smialowski (eds.), Hydrogen Degradation of Ferrous Alloys, Noyes Publ. Park, Ridge, USA, 1985.
• [14] P.F. Timmins, Solutions to hydrogen attack in steels, AMS Int., 1997.
• [15] H.K. Birnbaum, I. M. Robertson, P. Sofronis, D. Teter, Mechanisms of hydrogen related fracture. A review, Proc. 2nd Int. Conf. Corrosion Deformation Interaction, The Institute of Materials, London (1997) 172-195.
• [16] J.P. Hirth, Effects of hydrogen on the properties of iron and steel, Metallurgical Transactions A, 11A (1980) 861-890.
• [17] PN-EN 10137-2:2000 Plates and wide flats made of high yield strength structural steels in the quenched and tempered or precipitation hardened conditions – Delivery conditions for quenched and tempered steels.
• [18] PN-EN ISO 7539-7:2000 Corrosion of metals and alloys - Stress corrosion testing - Part 7: Slow strain rate testing.
• [19] PN-66/C-06502. Substitute seawater.
• [20] PN-EN 2832:2001 Aerospace series – Hydrogen embrittlement of steels - Notched specimen test.
• [21] PN-84/H-04334 Low-cycle fatigue testing for metals.