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Home  >  Journal list  >  Journal of the Society of Materials Science, Japan  >  Vol.57  No.11 (2008)  >  pp.1084-1090

Journal of the Society of Materials Science, Japan
<<Previous article Vol.57  No.11 (2008)   pp.1084 - 1090 Next article>>

Effect of Sensitization Treatment on Hydrogen Embrittlement Cracking of Duplex Stainless Steel

Keisuke KUROSE1), Hideo CHO2), Takeshi OGAWA2) and Mikio TAKEMOTO3)
1) Aoyama Gakuin Univ.
2) Dept. of Mech. Eng., Aoyama Gakuin Univ.
3) Adviser, Knmeta Eng. Co., Ltd.


This study aims to evaluate characteristics of hydrogen embrittlement cracking (HEC) of sensitized duplex stainless steel with simulated heat-affected zone (HAZ). The HEC of the steels, aged for 20hr at 650°C, 750°C and 800°C, were studied using a testing machine which can control the stress intensity factor, K, for the precracked compact type (CT) specimens subjected to hydrogen charging. Fracture mechanisms were studied by acoustic emission (AE) method in conjunction with metallographic observation. Fracture toughness, Kc, for the steel aged at 650°C was higher than those of others. The steel aged at 650°C, with hardened ferrite phase, suffered hydrogen-induced brittle cracks in front of main crack, while austenite phase exhibited ductile fracture. For the steels aged at 750°C and 800°C, both the ferrite and sigma phase suffered hydrogen-induced microcracks.


Keyword:
Duplex stainless steel, Heat-affected zone, Hydrogen embrittlement cracking, Ferrite phase, Sigma phase, Acoustic emission

Received: March 03, 2008
Published online: November 20, 2008
Copyright (c) 2008 by The Society of Materials Science, Japan

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