Boron Grain Boundary Segregation in a Heat Treatable Steel

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• 作者：Dipl.-Ing. Phillip Haslberger ; Christoph Turk…
• 关键词：Heat treatable steel ; Boron ; Austenite grain boundary ; Transmission Kikuchi diffraction ; Atom probe tomography ; Verg眉tungsstahl ; Bor ; Austenitkorngrenze ; Transmission Kikuchi Diffraktion ; Atomsonde
• 刊名：BHM Berg- und H篓鹿ttenm?nnische Monatshefte
• 出版年：2015
• 出版时间：May 2015
• 年：2015
• 卷：160
• 期：5
• 页码：204-208
• 全文大小：626 KB
• 参考文献：1. Keown, S. R.; Pickering, F. B.: Some aspects of the occurrence of boron in alloy steels, Materials science and technology, 11 (1977), no. 7, pp聽225鈥?34r>2. He, X. L.; Chu, Y. Y.; Jonas, J. J.: The grain boundary segregation of boron during isothermal holding, Acta metallurgica, 37 (1989), no. 11, pp聽2905鈥?916View Article r>3. Mun, D. J.; Shin, E. J.; Cho, K. C.; Lee, J. S.; Koo, Y. M.: Cooling rate dependence of boron distribution in low carbon steel, Metallurgical and materials transactions A, 43 (2012), no. 5, pp聽1639鈥?648View Article r>4. Simcoe, C. R.; Elsea, A. R.; Manning, G. K.: Study of the effect of boron on the decomposition of austenite, Journal of metals, 7 (1955), pp聽193鈥?00r>5. Melloy, G. F.; Slimmon, P. R.; Podgursky, P. P.: Optimizing the boron effect, Metallurgical transactions, 4 (1973), no. 10, pp聽2279鈥?289View Article r>6. Miller, M. K.; Cerezo, A.; Hetherington, M. G.; Smith, G. D. W.: Atom probe field ion microscopy, Oxford: Clarendon Press, 1996r>7. Schacht, E.; Richter, J.: Experiences with etching reagents to show former austenite grain boundaries in steels, Praktische Metallographie, 35 (1998), no. 7, pp聽384鈥?95r>8. Babinsky, K.; De Kloe, R.; Clemens, H.; Primig, S.: A novel approach for site-specific atom probe specimen preparation by focused ion beam and transmission electron backscatter diffraction, Ultramicroscopy, 144 (2014), pp聽9鈥?8View Article r>9. Miller, M. K.; Forbes, R. G.: Atom probe tomography, Materials characterization, 60 (2009), no. 6, pp聽461鈥?69View Article r>10. Morito, S.; Tanaka, H.; Konishi, R.; Furuhara, T.; Maki, T.: The morphology and crystallography of lath martensite in Fe-C alloys, Acta materialia, 51 (2003), no. 6, pp聽1789鈥?799View Article r>
• 作者单位：Dipl.-Ing. Phillip Haslberger (1) r> Christoph Turk (1) r> Katharina Babinsky (1) r> Devrim Caliskanoglu (2) r> Helmut Clemens (1) r> Sophie Primig (1) r>r>1. Department of Physical Metallurgy and Materials Testing, Montanuniversitaet Leoben, Roseggerstra脽e 12/2, 8700, Leoben, Austria r> 2. Buderus Edelstahl GmbH, Wetzlar, Germany r>
• 刊物类别：Engineering
• 刊物主题：Earth sciencesr>Mineral Resourcesr>
• 出版者：Springer Wien
• ISSN：1613-7531

文摘

By applying a heat treatment, such as hardening and tempering, the properties of a heat treatable steel, like 42CrMo4, can be adjusted over a wide range. In addition to the heat treatment, an appropriate alloying concept is crucial to be able to guarantee an outstanding performance over a large variety of applications. In the present study, the effects of boron as a microalloying element on a heat treatable steel were examined. It is well known that boron, if added in a proper amount, can significantly retard the transformation of austenite to bainite or ferrite/pearlite in low alloyed steels. During the heat treatment, it diffuses to the austenite grain boundaries, where it reduces the driving force for the nucleation of new phases. In order to prove this theory in a heat treatable steel, a prior austenite grain boundary was prepared for atom probe tomography (APT). The specimen preparation was carried out by electro-polishing, etching, and sharpening by focused ion beam (FIB) in combination with transmission Kikuchi diffraction (TKD). In the reconstruction of the corresponding APT measurement, boron could be found at the same prior austenite grain boundary.