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首页> 外文期刊>Key Engineering Materials >Characterization of Oxide Film Formed on Austenitic Stainless Steel by In-Situ Micro Raman Spectroscopy
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Characterization of Oxide Film Formed on Austenitic Stainless Steel by In-Situ Micro Raman Spectroscopy

机译：原位显微拉曼光谱表征奥氏体不锈钢上形成的氧化膜

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Crack initiation and crack propagation are known as two distinct stages of Environmentally Assisted Cracking (EAC). In the case of smooth surfaces, crack initiation is caused by rupture or degradation of surface film, which is induced by the combined effects of strain and electrochemical reaction with the environment. Therefore, to EAC, it is important to understand the mechanical and chemical properties of oxide film formed on smooth surfaces. Micro Raman Spectroscopy (MRS) was used to characterize the oxide film on deforming surfaces of austenitic stainless steel during tensile tests in air and high temperature water. A specimen pre-oxidized at 1000℃ was tested at room temperature. According to the Raman spectra, the pre-oxidized film mainly consisted of Cr, i.e., Cr_2O_3 and (Fe,Ni)Cr_2O_3. In addition, the Raman peak for Cr_2O_3 shifted during tensile tests. In the beginning, the wave number of the peak gradually decreasing with increase of strain until 5% strain. After 5% strain, the wave number increased, and then the cycle repeated itself again. On the other hand, oxide film formed in high temperature water mainly consisted of NiFe_2O_4, and the wave number for the NiFe_2O_4 peak did not shift. It is thought that NiFe_2O_4 molecules in oxide film do not deformed because they either delaminate or are loosely bonded. Oxide film that consists of NiFe_2O_4 might be easier to degrade than Cr oxide under straining conditions. Furthermore, in tensile tests performed in high temperature water, differences in the oxide composition between strained region and unstrained region was detected. The oxide film on strained region consisted of much more α-Fe_2O_3 and Cr oxide than that on unstrained region. In-situ Raman analysis showed that α-Fe_2O_3 and Cr oxide formed at about 0.1% strain and it is thought that the ability of the oxide film to protect the surface become low because of degradation caused by deformation.
机译：裂纹萌生和裂纹扩展是环境辅助裂纹（EAC）的两个不同阶段。在光滑表面的情况下，裂纹的产生是由表面膜的破裂或降解引起的，这是由应变和与环境的电化学反应的综合作用引起的。因此，对于EAC，重要的是要了解在光滑表面上形成的氧化膜的机械和化学性能。显微拉曼光谱法（MRS）用于在空气和高温水中进行拉伸试验期间表征奥氏体不锈钢变形表面上的氧化膜。在室温下测试在1000℃下预氧化的样品。根据拉曼光谱，预氧化膜主要由Cr组成，即Cr_2O_3和（Fe，Ni）Cr_2O_3。另外，在拉伸试验中，Cr_2O_3的拉曼峰发生了位移。在开始时，峰​​的波数随着应变的增加而逐渐减小，直到5％的应变。 5％应变后，波数增加，然后循环再次重复。另一方面，在高温水中形成的氧化膜主要由NiFe_2O_4组成，并且NiFe_2O_4峰的波数没有移动。认为氧化膜中的NiFe_2O_4分子不会变形，因为它们分层或键合松散。在应变条件下，由NiFe_2O_4组成的氧化膜可能比Cr氧化膜更容易降解。此外，在高温水中进行的拉伸试验中，检测出应变区域和非应变区域之间的氧化物组成的差异。与未应变区相比，应变区的氧化膜由更多的α-Fe_2O_3和Cr氧化物组成。原位拉曼分析表明，α-Fe_2O_3和Cr氧化物以约0.1％的应变形成，并且认为由于变形引起的降解，氧化物膜保护表面的能力降低。

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