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Investigation on Metallurgical Factors Controlling Charpy Impact Toughness in 1cr21ni5ti Duplex Stainless steel

Journal of Iron and steel Research International 2009年第2期16卷 73-79页

作者： YANG Zhuo-yue SU Jie WANG Ya-ming Institute of Structure Materials Central Iron and Steel Research Institute Beijing 100081 China steel Tube Department China Iron and Steel Research Institute Group Beijing 100081 China

Based on the fact that toughness degradation occurred in 1cr21ni5ti duplex stainless steel during slow cooling in a temperature interval of 400-600 ℃ following brazed welding, a simulated embrittlement treatment was utilized to evaluate its emhrittlement tendency. Accumulated experiences have shown that high ti and A1 contents led frequently to severe toughness deterioration. To elucidate this phenomenon, four heats with various ti and Al contents were prepared in laboratory-scale melts, which were used to investigate the inherent embrittlement nature. The results have shown that 550 ℃ aging led only to a modest toughness reduction, whereas, aging around 475 ℃ resulted in ferrite embrittlement, regardless of ti, A1 levels. However, high ti, A1 levels reduced the austenite phase, which, in the case of its inferior shape and distribution due to insufficient hot deformation, failed to resist cleavagetype cracks initiated in the ferrite phase. Increasing hot-forged areas reduction could modify the shape and distribution of austenite, resulting in the enhanced resistance of the austenite to the cleavage-type cracks, which have been confirmed to be beneficial for brittlement suppression of 1cr21ni5ti duplex stainless steel.

关键词： 1cr21ni5ti steel emhrittlement ti content AI content impact toughness

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