Effect of interface oxides on shear properties of hot-rolled stainless steel clad plate
Effect of interface oxides on shear properties of hot-rolled stainless steel clad plate
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DOI：
10.1016/j.msea.2016.05.066
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发表时间：
2016-07-04
期刊：
影响因子：
6.4
通讯作者：
Li, Xiao
中科院分区：
文献类型：
--
作者：
Zhu, Zhichao;He, Yi;Li, Xiao
通过对316L不锈钢/HSLA钢复合板界面组织、界面氧化物特征及剪切断裂模式的研究，确定了界面氧化物对复合板剪切性能的影响。结果表明，碳元素的扩散导致了基体的脱碳铁素体区（DFZ）和覆层金属的渗碳奥氏体区（CAZ）的形成，在这两种金属之间，在固态扩散连接过程中形成了元素成分快速变化的高硬度带（HHB）。结果表明，在微观尺度上，当CAZ边界氧化物集中区达到一定的阈值尺寸时，DFZ裂纹可能会在剪切过程中横穿刚性HHB并沿着CAZ边界扩展。因此，宏观尺度上的不均匀分布的氧化物导致大量的竞争性开裂之间的塑性DFZ和高强度CAZ，统计上保持在一个高水平的剪切强度与中等氧化水平的测试样品。然而，这些复合板仍可能无法满足产品的性能要求，因为在变形过程中，复合界面倾向于低断裂韧性失效。(C)2016爱思唯尔B. V.保留所有权利。
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. (C) 2016 Elsevier B.V. All rights reserved.