碳膨胀奥氏体钢低温表面硬化后铁磁性的合金相关性研究,Steel Research International

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碳膨胀奥氏体钢低温表面硬化后铁磁性的合金相关性研究
Steel Research International ( IF 1.9 ) Pub Date : 2021-07-29 , DOI: 10.1002/srin.202100272
Philipp Schuler ₁ , Ulrich Krupp ₁ , Paul Gümpel ₂ , Joachim Mayer ₃ , Alexander Schwedt ₃ , Anke Aretz ₃

Affiliation

铁磁性在不断发展的电动汽车和数据存储领域中的重要性日益增加。在稳定的奥氏体钢中，不会出现铁磁性，并且还会干扰许多应用。然而，奥氏体不锈钢在低温渗氮后的铁磁性过去已被证明。在此，奥氏体钢中铁磁性的存在是在低温渗碳（Kolsterizing）后发现的，这是一个新颖而独特的发现。通过低温渗碳在各种奥氏体不锈钢上建立了扩展奥氏体区，并研究了与合金成分相关的铁磁性。发生的铁磁性是通过商用磁感应传感器 (Feritscope) 确定的。铁磁域通过磁力显微镜和铁磁流体可视化。X 射线衍射测量表明不同合金的晶格膨胀存在明显差异。此外，根据电子背散射衍射 (EBSD) 确定的晶粒取向，检测到可磁化微结构区域（磁畴结构）的不同外观。明显的磁畴显示没有线性晶格缺陷，而在小的可磁化区域中，通过电子通道对比成像和 EBSD 检测到线性晶格缺陷。根据电子背散射衍射 (EBSD) 确定的晶粒取向，检测到可磁化微结构区域（磁畴结构）的不同外观。明显的磁畴显示没有线性晶格缺陷，而在小的可磁化区域中，通过电子通道对比成像和 EBSD 检测到线性晶格缺陷。根据电子背散射衍射 (EBSD) 确定的晶粒取向，检测到可磁化微结构区域（磁畴结构）的不同外观。明显的磁畴显示没有线性晶格缺陷，而在小的可磁化区域中，通过电子通道对比成像和 EBSD 检测到线性晶格缺陷。

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Investigation of Alloy-Dependent Occurrence of Ferromagnetism in Carbon-Expanded Austenitic Steel after Low-Temperature Surface Hardening

Ferromagnetism is of increasing importance in the growing field of electromobility and data storage. In stable austenitic steels, the occurrence of ferromagnetism is not expected and would also interfere with many applications. However, ferromagnetism in austenitic stainless steels after low-temperature nitriding has already been shown in the past. Herein, the presence of ferromagnetism in austenitic steels is discovered after low-temperature carburization (Kolsterizing), which represents a novel and unique finding. A zone of expanded austenite is established on various austenitic stainless steels by low-temperature carburization and the respective ferromagnetism is investigated in relation to the alloy composition. The ferromagnetism occurring is determined by means of a commercial magnetoinductive sensor (Feritscope). Ferromagnetic domains are visualized by magnetic force microscopy and a ferrofluid. X-ray diffraction measurements indicate a clear difference in the lattice expansion of the different alloys. Furthermore, a different appearance of the magnetizable microstructure regions (magnetic domain structure) is detected depending on the grain orientation determined by electron backscatter diffraction (EBSD). Strongly pronounced magnetic domains show no linear lattice defects, whereas in small magnetizable areas linear lattice defects are detected by electron channeling contrast imaging and EBSD.

更新日期：2021-07-29

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