Effect of interface oxides on shear properties of hot-rolled stainless steel clad plate

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• 作者：Zhichao Zhu ; ^{zczhu87@126.com" class="auth_mail" title="E-mail the corresponding author} ; Yi He ; Xinjin Zhang ; Huiyun Liu ; Xiao Li
• 关键词：Clad plate ; Interfacial microstructure ; Shear strength ; Fracture model
• 刊名：Materials Science & Engineering A
• 出版年：2016
• 出版时间：4 July 2016
• 年：2016
• 卷：669
• 期：Complete
• 页码：344-349
• 全文大小：1733 K

文摘

This paper aims at determine the effect of interface oxides on shear properties of 316L stainless steel/HSLA steel clad plate by studying interface microstructure, characteristics of interface oxides and shear fracture model. It was found that carbon element diffusion caused the forming of a decarburized ferrite zone (DFZ) of the substrate and a carburized austenite region (CAZ) of the clad metal, and between those two metals, a high-hardness band (HHB) with rapid element component change are formed in the solid-state diffusion bonding process. It was revealed that, at the micro-scale, when oxides concentrated area on the boundary of CAZ reaches up to a threshold size, DFZ crack may carve across the rigid HHB and propagate along CAZ boundary during the shear test. Thus macro-scale nonuniform distribution of oxides led to massive competitive cracking between the plastic DFZ and the high-strength CAZ, and statistically maintain the shear strength at a high level for test samples with a medium oxidation level. Nevertheless, those clad plates may still fail to meet the performance request of products, since the cladding interface tended toward a low fracture toughness failure during the process of deformation.