Naslov
Embrittlement damage of low alloy Mn-V steel

Autori
Gojić, Mirko ; Kosec, Ladislav ; Matković, Prosper

Izvornik
Engineering Failure Analysis (1350-6307) 10 (2003), 1; 93-102

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Mechanical testing; Grain size; Fractography; Hydrogen embrittlement; Microstructure

Sažetak
This work describes the hydrogen embrittlement damage of tubing made from a commercial low alloy manganese steel containing vanadium. Hydrogen charging of steels was carried out in 0.5 M H2SO4 solution which contained 10 mg/l As2O3 for 2 h under static load. Fractography was carried out using a scanning electron microscope (SEM) equipped with energy dispersive X-ray spectrometry (EDXS). Normalizing the tubing increased the yield strength. Tubing normalized at 900 °C is more resistant to hydrogen embrittlement (HE) compared to that in the as-received condition. The improved behaviour of steels when normalized at 900 °C can be attributed to a fine ferrite-pearlite microstructure (mean area of pearlite colonies 2.5 times smaller than in the as-received condition) and a beneficial variation in hydrogen trapping behaviour. Initiation of fracture occurred at complex inclusion/matrix interfaces. The size of the inclusions that caused fracture was 2 to 5 micrometer.

Izvorni jezik
Engleski

Znanstvena područja
Metalurgija

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