Experimental Investigation of the Phase Relationship of the Fe-Cr-Sn System
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Experimental Investigation of the Phase Relationship of the FeCr-Sn System Zhihua Zhou1 • Ya Liu1,2 • Changjun Wu1 • Haoping Peng1 • Jianhua Wang1,3 Xuping Su3
•
Submitted: 14 January 2020 / in revised form: 20 April 2020 ASM International 2020
Abstract In this work, 700 and 850 C isothermal sections of the Fe-Cr-Sn ternary system were experimentally determined by means of optical microscopy, scanning electron microscopy combined with energy dispersive spectrometry, and X-ray diffraction. At 700 C, the existence of four binary compounds, FeSn, FeSn2, Fe3Sn2, and r-FeCr were confirmed. Four three-phase regions were identified in the isothermal section of this system at 700 C, and the maximum solubility of Cr in FeSn and Fe3Sn2 at 700 C is 10.7 and 15.6 at%, respectively. At 850 C, the existence of binary compound Fe5Sn3 phase was confirmed, and a three-phase equilibria of Fe5Sn3, a(Fe,Cr), and liquid was determined. The maximum solubility of Cr in Fe5Sn3 at 850 C is 5.8 at%. Keywords Fe-Cr-Sn isothermal section phase equilibrium solubility
& Ya Liu [email protected] & Xuping Su [email protected] 1
Key Laboratory of Materials Surface Science and Technology of Jiangsu Province, Changzhou University, Changzhou 213164, China
2
Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering, Changzhou University, Changzhou 213164, China
3
National Experimental Teaching Demonstration Center of Materials Science and Engineering, Changzhou University, Changzhou 213164, China
1 Introduction Advanced high-strength steel (AHSS) features high strength and good forming and processing properties. In order to obtain the characteristic microstructure and properties, Cr, Al, Si, and Mn are added to the AHSS. The alloying elements in AHSS are susceptible to selective oxidation during industrial continuous galvanizing recrystallization annealing, which results in varying degrees of internal or external oxidation of the steel, forming oxides on the surface.[1–5] Cho et al. have added surface-active elements such as Sn and Bi to the composition of the steel matrix.[6–8] The surface-active elements segregate to the surface grain boundary during the annealing process, hindering the penetration of oxygen and reducing the internal oxidation of the steel sheet to avoid the negative effects of selective oxides.[9–12] Fe-Cr alloys are widely used due to their extreme corrosion resistance, good wear resistance, and toughness. However, the presence of a hard brittle phase will greatly affect the mechanical properties of the alloy. Costa et al. studied the addition of Sn to the alloy to improve the influence of the r phase.[13–15] As the concentration of Sn in the alloy increases, the formation rate of the r phase decreases. Meanwhile, the grain size of the alloy is also reduced, which improves the mechanical properties.[16, 17] Studying the Fe-Cr-Sn phase diagram has a great influence on the application of the Fe-Cr alloy. In addition, the Fe-Cr-Sn alloy has great development prospects as a magnetic materi
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