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[Xiaohuan Li,Guowei Cui,Sihan Chen,Tian Liang,Weiwei Xing,Yingche Ma,Ping Wang,JinMing Wu and Guobin Li.Effect of Silicon on Precipitates of High-Silicon Austenitic Stainless Steel[J].Rare Metal Materials and Engineering,2022,51(8):2769~2776.]
Effect of Silicon on Precipitates of High-Silicon Austenitic Stainless Steel
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Received:July 07, 2021  Revised:July 19, 2022
DOI:
Key words: high-silicon austenitic stainless steel  silicon content  σ-phase  micro-hardness tester  Cr3Ni5Si2 phase
Foundation item:Postdoctoral Research Funding Project of Zhejiang Province (ZJ2020017)
Author NameAffiliation
Xiaohuan Li,Guowei Cui,Sihan Chen,Tian Liang,Weiwei Xing,Yingche Ma,Ping Wang,JinMing Wu and Guobin Li  
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Abstract:
      The effect of silicon contents (4wt%~8wt%) on microstructure of high-silicon austenitic stainless steel ZeCor was investigated by XRD, TEM and indentation deformation. Results show that increasing Si content leads to the phase constitute change of ZeCor alloy: the microstructure is single-phase austenite (γ phase) in ZeCor-4wt%Si alloy, γ phase with a small quantity of σ-phase in ZeCor-6wt%Si alloy, and as for the ZeCor-8wt%Si alloy, the main precipitations are Cr3Ni5Si2 phase and a bit σ-phases. In addition, the Cr3Ni5Si2 phase has a higher silicon and nickel content than the σ-phase. The Cr3Ni5Si2 phase with a micro-hardness HV as high as 7840 MPa is a typical hard and brittle phase, and the precipitation of such phase can greatly increase the micro-hardness of the γ matrix in the ZeCor-8wt%Si alloy. The strengthening mechanism of γ matrix in ZeCor alloy is as follows: the solid solution strengthening is the main strengthening mechanism in ZeCor-6wt%Si alloy, while the solid solution strengthening of Si and the precipitation strengthening of Cr3Ni5Si2 greatly increase the micro-hardness of the γ matrix in ZeCor-8wt%Si alloy, and the Cr3Ni5Si2 phases have a great effect.