Microstructure and Interface Fracture Characteristics of Hot-Rolled Stainless Steel Clad Plates by Adding Different Interlayers
Microstructure and Interface Fracture Characteristics of Hot-Rolled Stainless Steel Clad Plates by Adding Different Interlayers
复制标题
添加不同中间层的热轧不锈钢复合板的显微组织及界面断裂特性
DOI：
10.1002/srin.201900604
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发表时间：
2020-01-29
影响因子：
2.2
通讯作者：
Yin, FuXing
中科院分区：
文献类型：
--
作者：
Wang, Shuai;Liu, BaoXi;Yin, FuXing
采用热轧工艺制备了以Fe、Ni、Nb为中间层的316L/Q235系列不锈钢复合板。采用光学显微镜（OM）、超深层显微镜（U-D）、扫描电镜（SEM）、电子探针（EPMA）、透射电镜（TEM）和万能试验机等对复合板的界面组织、界面特性、剪切性能、拉伸性能和断口形貌进行了详细的研究。观察到Fe中间层的加入对界面元素扩散的影响不大。含铁中间层的复合板拉伸和剪切性能较差，这是由于复合界面处严重氧化造成的。而添加Ni和Nb中间层则能有效地抑制界面碳元素的扩散行为，显著减小渗碳层和脱碳层的界面薄弱区。这是由于Ni中间层能显著减缓碳的扩散速度，Nb中间层能与碳元素反应生成碳化铌相，抑制界面碳的扩散。添加Ni或Nb中间层后，不锈钢复合板可获得上级的界面结合强度、抗拉强度和断裂伸长率，最终达到界面强韧化的目的。
Series of 316L/Q235 stainless steel clad plates are successfully fabricated by hot rolling with different interlayers of ferrum (Fe), nickel (Ni), and niobium (Nb) foils. The interface microstructure, interfacial characteristics, shear performance, tensile properties, and fracture morphologies of clad plates are investigated using optical microscope (OM), ultra-depth microscope, scanning electron microscope (SEM), electron probe microanalysis (EPMA), transmission electron microscope (TEM), and universal testing in detail. It is observed that the addition of Fe interlayer has rare effect on the interface element diffusion. Clad plate with Fe interlayer can only obtain poor tensile and shear properties, which is attributed to severe oxidation at the clad interface. On the contrary, the addition of Ni and Nb interlayers can both effectively inhibit the diffusion behavior of interface carbon element and remarkably reduce interfacial weak areas of carburized and decarburized layers. This is due to that Ni interlayer can sharply slow down the carbon diffusion velocity, and Nb interlayer can suppress interface carbon diffusion by reacting with carbon element and forming niobium carbide phase. After adding Ni or Nb interlayers, stainless steel clad plates can obtain superior interfacial bonding strength, tensile strength, and fracture elongation, eventually achieving the purpose toward strengthening and toughening the interface.