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首页> 外文会议>17th European conference on fracture : Multilevel approach to fracture of materials, components and structures : Book of abstracts amp; proceedings on CD ROM >Delayed Cracking in a Metastable Austenitic Stainless Steel
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Delayed Cracking in a Metastable Austenitic Stainless Steel

机译：亚稳态奥氏体不锈钢中的延迟裂纹

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The mechanical properties of metastable austenitic steel were characterized by means ofrntensile testing and cupping tests. High sensitivity to the strain rate was observed. The fracturernmechanism in tensile specimens at the strain rate lower than (ε) =10-3 s-1 was the combination ofrncleavage and ductile dimpled rupture. At the strain rate higher than (ε) =10-3 s-1 fracture mechanismrnchanged to entire ductile dimpled rupture. Fracture mechanisms were very different in tensilernspecimens and in deep drawn cups. After deep drawing tests with drawing ratios DR > 1.5 delayedrncracking occurred. Main fractographic feature observed in cracked deep drawn cups was thernintergranular decohesion.
机译：亚稳奥氏体钢的力学性能通过拉伸试验和拔罐试验来表征。观察到对应变率的高敏感性。拉伸速率低于（ε）= 10-3 s-1的拉伸试样的断裂机理是断裂和韧性凹痕断裂的结合。在高于（ε）= 10-3 s-1的应变速率下，断裂机制改变为整个延性凹坑破裂。拉伸试样和深冲杯中的断裂机理差异很大。在拉伸比DR> 1.5的深冲试验之后，发生了延迟裂纹。在破裂的深冲杯中观察到的主要分形特征是晶间脱粘。

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