Evaluation of hydrogen degradation of high-strength weldable steels

• Autorzy: Ćwiek J. , Michalska-Ćwiek J.
• Języki publikacji: EN

Abstrakty

EN

Purpose: of this paper is evaluation of susceptibility of a high-strength steel and welded joints to hydrogen degradation and establishing of applicable mechanism of their hydrogen embrittlement and hydrogen delayed cracking. Design/methodology/approach: High-strength quenched and tempered steel grade S690Q and its welded joints have been used. Susceptibility to hydrogen embrittlement of steel and welded joints has been evaluated using monotonically increasing load. Slow strain rate test (SSRT) was carried out in hydrogen generating environment, i.e. artificial sea water under cathodic polarization. Susceptibility to hydrogen delayed cracking has been evaluated under constant load in artificial sea water under cathodic polarization. Fractographic examinations with the use of scanning electron microscope (SEM) were performed to establish suitable mechanism of hydrogen-enhanced cracking. Findings: Tested high-strength steels and its welded joints are susceptible to hydrogen embrittlement when evaluated with the use of SSRT. The loss of plasticity is higher for welded joints then for the base metal. Tested steels and welded joints reveal high resistance to hydrogen degradation under constant load. Research limitations/implications: Further research should be taken to reveal the exact mechanism of crack initiation. Practical implications: Tested steel and its welded joints could be safely utilized in marine constructions under cathodic protection provided that overprotection does not take place. Tested steel could be safely utilized within elastic range of stress in hydrogen generating environments. Originality/value: Hydrogen-enhanced localized plasticity (HELP) model is more applicable mechanism of hydrogen degradation for tested steel and its welded joints under monotonically increasing load in seawater environment. Under the critical load and hydrogen concentration notched samples premature failed and hydrogen-enhanced localised plasticity (HELP) model is a viable degradation mechanism.

Słowa kluczowe

EN

crack resistance; high-strength steel; welded joint; hydrogen degradation

PL

odporność na pękanie; stal wysokowytrzymała; złącze spawane; rozkład wodoru

• Wydawca: International OCSCO World Press
• Czasopismo: Journal of Achievements in Materials and Manufacturing Engineering
• Rocznik: 2010
• Tom: Vol. 42, nr 1-2
• Strony: 103--110
• Opis fizyczny: Bibliogr. 23 poz., rys., tabl.

Twórcy

autor

Ćwiek J.

autor

Michalska-Ćwiek J.

• Division of Materials Processing Technology, Management and Computer Techniques in Materials Science, Institute of Engineering Materials and Biomaterials, Silesian University of Technology, ul. Konarskiego 18a, 44-100 Gliwice, Poland,

Bibliografia

• [1] J. Ćwiek, High strength weldable steels, Mechanical Review 9 (1996) 9-15 (in Polish).
• [2] 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.
• [3] L. Coudreuse, C. Renaudin, P. Bocquet, L. Cadiou, Evaluation of hydrogen assisted cracking resistance of high strength jack-up steels, Marine Structures 10 (1997) 85-106.
• [4] J.V. Sharp, J. Billingham, M.J. Robinson, The risk management of high-strength steels in jack-ups in seawater, Marine Structures 14 (2001) 537-551.
• [5] S.P. Lynch, Failures of structures and components by environmentally assisted cracking, Engineering Failure Analysis 2 (1994) 77-90.
• [6] Offshore Technology Report - OTO 1999 056, A review of the effects of microstructure on the hydrogen embrittlement of high strength offshore steels. Health and Safety Executive, 1999.
• [7] P.F. Timmins, Solutions to hydrogen attack in steels, AMS International, 1997.
• [8] A. Zieliński, Hydrogen degradation of nonferrous metals and alloys. Gdansk Scientific Society, Gdańsk, 1999 (in Polish).
• [9]R.A. Oriani, J.P. Hirth, M. Smialowski (eds.), Hydrogen degradation of ferrous alloys, Noyes Publications Park, Ridge, USA, 1985.
• [10]H.K. Birnbaum, I.M. Robertson, P. Sofronis, D. Teter, Mechanisms of hydrogen related fracture. A review, Proceedings of the 3rd International Conference “Corrosion - Deformation Interactions” CDI’97, The Institute of Materials, London, 1997, 172-195.
• [11]J.P. Hirth, Effects of hydrogen on the properties of iron and steel, Metallurgical Transactions A 11 (1980) 861-890.
• [12]S.P. Lynch, A commentary on mechanisms of environ-mentally assisted cracking, Proceedings of the 2nd International Conference „Corrosion - Deformation Interactions” CDI’96, Nice, France, The Institute of Materials, 1996, 206-219.
• [13]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.
• [14]PN-EN 10002-1:2004 Metallic materials – Tensile testing – Part 1 – Method of test at ambient temperature.
• [15]PN-EN ISO 7539-7:2000 Corrosion of metals and alloys – Stress corrosion testing – Part 7: Slow strain rate testing.
• [16]PN-66/C-06502. Substitute seawater.
• [17]PN-EN 2832:2001 Aerospace series – Hydrogen embrittlement of steels – Notched specimen test.
• [18]J. Ćwiek, Hydrogen degradation of high strength weldable steels, Journal of Achievements in Materials and Manufacturing Engineering 20 (2007) 223-226.
• [19]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.
• [20]J. Ćwiek, Hydrogen degradation of high strength steels, Journal of Achievements in Materials and Manufacturing Engineering 37/2 (2009) 193-212.
• [21]B.Ćwieczko-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.
• [22]J. Ćwiek, Plasma nitriding as a prevention method against hydrogen degradation of steels, Journal of Achievements in Materials and Manufacturing Engineering 36/1 (2009) 25-32.
• [23]J. Ćwiek, M. Baczyńska, Behaviour of nitrided layers subjected to influence of hydrogen, Archives of Materials Science and Engineering 43/1 (2010) 30-41.