Embrittlement damage of low alloy Mn–V steel

✍ Scribed by M Gojić; L Kosec; P Matković

• Publisher: Elsevier Science
• Year: 2003
• Tongue: English
• Weight: 538 KB
• Volume: 10
• Category: Article
• ISSN: 1350-6307
• DOI: 10.1016/s1350-6307(02)00038-9

✦ Synopsis

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 H 2 SO 4 solution which contained 10 mg/l As 2 O 3 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 mm.