Comparative study of the testing approaches for the susceptibility of high-strength fasteners to environmental hydrogen embrittlement (EHE)
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Olesya Gosheva
Abstract
Low-alloyed, high-strength steels with yield strength above 1200 MPa are frequently used in the automotive industry, in order to reduce the weight of the components. However, hydrogen embrittlement susceptibility is often a concern for this group of materials. Hydrogen can be produced on the metal surface, as a result of electrochemical corrosion reaction during service. The aim of this study is to evaluate the impact of the various loading procedures according to the existing technical specifications for environmental hydrogen embrittlement (EHE) testing. The hydrogen embrittlement susceptibility of high strength fasteners (strength class 14.8) was tested according to the well-established testing specifications: DIN 50969-2, DIN EN ISO 7539, ASTM F1624-12 in 5 wt.-% sodium chloride solution acidified to pH 3 with hydrochloric acid. Open circuit potential measurements were carried out during the testing procedure to gain understanding of the damage process in each of the testing approaches. Under the chosen testing conditions, rising step load (RSL) testing approach, specified in ASTM F1624-12, appeared as the most sensitive method for the evaluation of the material's hydrogen embrittlement susceptibility.
Kurzfassung
Das angestrebte Ziel der Gewichtsreduktion wird im Automobilbau häufig durch den Einsatz von niedriglegierten hochfesten Stahlwerkstoffen mit Festigkeiten höher als 1200 MPa realisiert. Jedoch werden die Einsatzbereiche dieser Werkstoffgruppe aufgrund der erhöhten Werkstoffempfindlichkeit gegenüber wasserstoffunterstützter Spannungsrisskorrosion stark eigeschränkt. Unter anderem kann Wasserstoff aufgrund einer elektrochemischen Korrosionsreaktion während einer Betriebsphase auf der Bauteiloberfläche entstehen. Ziel der diesem Beitrag zugrunde liegenden Untersuchung war es, die Vielfalt existierender Testmethoden bezüglich einer möglichen wasserstoffunterstützten Rissbildung im Betrieb. Hierzu wurden hochfeste Schrauben der Festigkeitsklasse 14.8 unter Anwendung von etablierten Prüfspezifikationen nach DIN 50969-2, DIN EN ISO 7539 und ASTM 1624-12 (DIN 50969-3) hinsichtlich ihrer Anfälligkeit für eine wasserstoffunterstützte Rissbildung in einer sauren 5 % Natriumchlorid-Lösung bei einem pH-Wert von 3 geprüft‥ Zusätzlich aufgenommene Verläufe des freien Korrosionspotenzials ermöglichten ein besseres Verständnis des während der Prüfung auftretenden Mechanismus der Werkstoffschädigung. Unter den gewählten Prüfbedingungen wies die Methode des Rising Step Load (RSL) Tests (ASTM 1624-12) die höchste Empfindlichkeit bezüglich des Potentials einer wasserstoffunterstützten Rissbildung auf.
References
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© 2018, Carl Hanser Verlag, München
Artikel in diesem Heft
- Inhalt/Contents
- Contents
- Fachbeiträge/Technical Contributions
- Effect of strain rate on stress corrosion cracking of X100 pipeline steel in environments with sulfate-reducing bacteria
- Influence of microstructural parameters of indefinite chill alloys on flexural strength and Young's modulus
- Corrosion behavior of a 3 % Cr tubing steel in a CO2 saturated high-salinity brine
- Comparative study of the testing approaches for the susceptibility of high-strength fasteners to environmental hydrogen embrittlement (EHE)
- Combined impact of UV radiation and nitric acid on HDPE containers during outdoor exposure
- Analysis of wear properties of Zn-based composites using the Taguchi method
- Microstructural and mechanical properties of friction and MIAB welded carbon steel tubes and forging bracket joints
- Influence of sintering temperature on mechanical properties of spark plasma sintered pre-alloyed Ti-6Al-4 V powder
- Ultrasound on-line measurement of pulverized coal flow in coal-fired boilers
- Comparison of seismic performance between thermal insulation concrete and normal concrete shear walls
- Test procedure for stress damage of ferromagnetic materials based on metal magnetic memory effects
- Lightweight design of an automobile hinge component using glass fiber polyamide composites
- Comparison of grey wolf, whale, water cycle, ant lion and sine-cosine algorithms for the optimization of a vehicle engine connecting rod
- Influence of a stepped feed rate on burr formation when drilling Al-5005
- Relationship between extrusion temperature and corrosion resistance of magnesium alloy AZ61
Artikel in diesem Heft
- Inhalt/Contents
- Contents
- Fachbeiträge/Technical Contributions
- Effect of strain rate on stress corrosion cracking of X100 pipeline steel in environments with sulfate-reducing bacteria
- Influence of microstructural parameters of indefinite chill alloys on flexural strength and Young's modulus
- Corrosion behavior of a 3 % Cr tubing steel in a CO2 saturated high-salinity brine
- Comparative study of the testing approaches for the susceptibility of high-strength fasteners to environmental hydrogen embrittlement (EHE)
- Combined impact of UV radiation and nitric acid on HDPE containers during outdoor exposure
- Analysis of wear properties of Zn-based composites using the Taguchi method
- Microstructural and mechanical properties of friction and MIAB welded carbon steel tubes and forging bracket joints
- Influence of sintering temperature on mechanical properties of spark plasma sintered pre-alloyed Ti-6Al-4 V powder
- Ultrasound on-line measurement of pulverized coal flow in coal-fired boilers
- Comparison of seismic performance between thermal insulation concrete and normal concrete shear walls
- Test procedure for stress damage of ferromagnetic materials based on metal magnetic memory effects
- Lightweight design of an automobile hinge component using glass fiber polyamide composites
- Comparison of grey wolf, whale, water cycle, ant lion and sine-cosine algorithms for the optimization of a vehicle engine connecting rod
- Influence of a stepped feed rate on burr formation when drilling Al-5005
- Relationship between extrusion temperature and corrosion resistance of magnesium alloy AZ61