Fracture behavior of an austenitic stainless steel with nanoscale deformation twins

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• 作者：L. Xiong^a ; Z.S. You^a ; ^b ; L. Lu^a ; ¹ ; ^{llu@imr.ac.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Nanotwinned stainless steel ; Fracture toughness ; Shear deformation ; Void nucleation
• 刊名：Scripta Materialia
• 出版年：2017
• 出版时间：15 January 2017
• 年：2017
• 卷：127
• 期：Complete
• 页码：173-177
• 全文大小：1417 K

文摘

A bulk nanotwinned austenitic stainless steel containing a large volume fraction of deformation twins was produced by dynamic plastic deformation. The tensile tests and J-integral fracture toughness measurements indicate that this steel exhibits a combination of high strength (σ_ys = 920 MPa) and considerable fracture toughness (K_JC > 126 MPa m^1/2). The fracture is associated with localized shear band induced destruction of the nanotwinned structure and with micro-void development at the generated nanoscale large angle grain boundaries within the shear bands, which consumes large plastic energy and contributes the fracture resistance.