Thermodynamic Analysis and Experimental Study on Precipitation of Carbonitrides in Nb-V-Ti-N Microalloyed Structural Steel AITranslate
Abstract AITranslate
To better investigate the precipitation behavior of carbonitrides(MX)in Nb-V-Ti-N microalloyed structural steel,the Thermo-Calc software combined with TCFE8database was used to analyze the type,quantity,temperature and composition of the precipitated carbonitrides.And their morphology,composition,size and distribution were analyzed using FESEM,TEM and EDS.The results show that the MX precipitates in the steel are Ti-rich high-temperature precipitate,Nb-rich intermediate-temperature precipitate and V-rich low-temperature precipitate with FCC structure.As Nb mass fraction increases from 0.050%to 0.100%,precipitation temperature and quantity of Nb-rich phase are increased from 1210℃to 1270℃and from 6.877×10-4 to 1.265×10-3,respectively.Oppositely,the precipitation temperature of Ti-rich phase and V-rich phase is decreased from 1451℃to 1434℃and from 1080℃to 1020℃,respectively.And their precipitation quantity is decreased from 3.663×10-4 to 2.331×10-4 and from 5.562×10-3 to 5.281×10-3,respectively.The precipitation characteristics of MX under non-equilibrium conditions ob-tained from the experimental study are basically consistent with the thermodynamic calculation results.The submicron particles precipitated in the high-temperature austenite region can pin the grain boundaries and induce the formation of intragranular ferrite,which enhances the fine-grain strengthening effect.The nanoparticles precipitated in the intermediate-temperature two-phase region and low-temperature ferrite region are distributed in the matrix,dislocations and grain boundaries,which can effectively hinder the move-ment of dislocations and improve the precipitation strengthening effect.The combined action of the two aspects mentioned above improves the strength and toughness of structural steel.
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Basic Information:
DOI：
Chinese Library Classification Number:TG146.41[金属学及工艺—金属材料]
Citation Information:
To better investigate the precipitation behavior of carbonitrides(MX)in Nb-V-Ti-N microalloyed structural steel,the Thermo-Calc software combined with TCFE8database was used to analyze the type,quantity,temperature and composition of the precipitated carbonitrides.And their morphology,composition,size and distribution were analyzed using FESEM,TEM and EDS.The results show that the MX precipitates in the steel are Ti-rich high-temperature precipitate,Nb-rich intermediate-temperature precipitate and V-rich low-temperature precipitate with FCC structure.As Nb mass fraction increases from 0.050%to 0.100%,precipitation temperature and quantity of Nb-rich phase are increased from 1210℃to 1270℃and from 6.877×10-4 to 1.265×10-3,respectively.Oppositely,the precipitation temperature of Ti-rich phase and V-rich phase is decreased from 1451℃to 1434℃and from 1080℃to 1020℃,respectively.And their precipitation quantity is decreased from 3.663×10-4 to 2.331×10-4 and from 5.562×10-3 to 5.281×10-3,respectively.The precipitation characteristics of MX under non-equilibrium conditions ob-tained from the experimental study are basically consistent with the thermodynamic calculation results.The submicron particles precipitated in the high-temperature austenite region can pin the grain boundaries and induce the formation of intragranular ferrite,which enhances the fine-grain strengthening effect.The nanoparticles precipitated in the intermediate-temperature two-phase region and low-temperature ferrite region are distributed in the matrix,dislocations and grain boundaries,which can effectively hinder the move-ment of dislocations and improve the precipitation strengthening effect.The combined action of the two aspects mentioned above improves the strength and toughness of structural steel.
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| GB/T 7714-2015 | [1] GE Zi-wei, ZHANG Jing, XIN Wen-bin, et al. Thermodynamic Analysis and Experimental Study on Precipitation of Carbonitrides in Nb-V-Ti-N Microalloyed Structural Steel[J]. Rare Metals and Cemented Carbides, 2022(3): 57-64. |
| MLA | [1] GE Zi-wei, et al., "Thermodynamic Analysis and Experimental Study on Precipitation of Carbonitrides in Nb-V-Ti-N Microalloyed Structural Steel." Rare Metals and Cemented Carbides, no. 3, 2022, pp. 57-64. |
| APA | [1] GE Zi-wei, ZHANG Jing, XIN Wen-bin, GU Jing-yuan, & LUO Guo-ping. (2022). Thermodynamic Analysis and Experimental Study on Precipitation of Carbonitrides in Nb-V-Ti-N Microalloyed Structural Steel. Rare Metals and Cemented Carbides(3), 57-64. |
| IEEE | [1] GE Zi-wei, ZHANG Jing, XIN Wen-bin, GU Jing-yuan, and LUO Guo-ping, "Thermodynamic Analysis and Experimental Study on Precipitation of Carbonitrides in Nb-V-Ti-N Microalloyed Structural Steel," Rare Metals and Cemented Carbides, no. 3, pp. 57-64, 2022. keywords: {Nb-V-Ti-N microalloy system;structural steel;precipitated phase;carbonitride;thermodynamic calculation} |