You Xie, Guo-guang Cheng, Lie Chen, Yan-dong Zhang, and Qing-zhong Yan, Mechanism of generation of large (Ti,Nb,V)(C,N)-type precipitates in H13 + Nb tool steel, Int. J. Miner. Metall. Mater., 23(2016), No. 11, pp. 1264-1274. https://doi.org/10.1007/s12613-016-1348-3
Cite this article as:
You Xie, Guo-guang Cheng, Lie Chen, Yan-dong Zhang, and Qing-zhong Yan, Mechanism of generation of large (Ti,Nb,V)(C,N)-type precipitates in H13 + Nb tool steel, Int. J. Miner. Metall. Mater., 23(2016), No. 11, pp. 1264-1274. https://doi.org/10.1007/s12613-016-1348-3
You Xie, Guo-guang Cheng, Lie Chen, Yan-dong Zhang, and Qing-zhong Yan, Mechanism of generation of large (Ti,Nb,V)(C,N)-type precipitates in H13 + Nb tool steel, Int. J. Miner. Metall. Mater., 23(2016), No. 11, pp. 1264-1274. https://doi.org/10.1007/s12613-016-1348-3
Citation:
You Xie, Guo-guang Cheng, Lie Chen, Yan-dong Zhang, and Qing-zhong Yan, Mechanism of generation of large (Ti,Nb,V)(C,N)-type precipitates in H13 + Nb tool steel, Int. J. Miner. Metall. Mater., 23(2016), No. 11, pp. 1264-1274. https://doi.org/10.1007/s12613-016-1348-3
The characteristics and generation mechanism of (Ti,Nb,V)(C,N) precipitates larger than 2 μm in Nb-containing H13 bar steel were studied. The results show that two types of (Ti,Nb,V)(C,N) phases exist—a Ti-V-rich one and an Nb-rich one—in the form of single or complex precipitates. The sizes of the single Ti-V-rich (Ti,Nb,V)(C,N) precipitates are mostly within 5 to 10 μm, whereas the sizes of the single Nb-rich precipitates are mostly 2–5 μm. The complex precipitates are larger and contain an inner Ti-V-rich layer and an outer Nb-rich layer. The compositional distribution of (Ti,Nb,V)(C,N) is concentrated. The average composition of the single Ti-V-rich phase is (Ti0.511V0.356Nb0.133)(CxNy), whereas that for the single Nb-rich phase is (Ti0.061V0.263Nb0.676)(CxNy). The calculation results based on the Scheil–Gulliver model in the Thermo-Calc software combining with the thermal stability experiments show that the large phases precipitate during the solidification process. With the development of solidification, the Ti-V-rich phase precipitates first and becomes homogeneous during the subsequent temperature reduction and heat treatment processes. The Nb-rich phase appears later.
The characteristics and generation mechanism of (Ti,Nb,V)(C,N) precipitates larger than 2 μm in Nb-containing H13 bar steel were studied. The results show that two types of (Ti,Nb,V)(C,N) phases exist—a Ti-V-rich one and an Nb-rich one—in the form of single or complex precipitates. The sizes of the single Ti-V-rich (Ti,Nb,V)(C,N) precipitates are mostly within 5 to 10 μm, whereas the sizes of the single Nb-rich precipitates are mostly 2–5 μm. The complex precipitates are larger and contain an inner Ti-V-rich layer and an outer Nb-rich layer. The compositional distribution of (Ti,Nb,V)(C,N) is concentrated. The average composition of the single Ti-V-rich phase is (Ti0.511V0.356Nb0.133)(CxNy), whereas that for the single Nb-rich phase is (Ti0.061V0.263Nb0.676)(CxNy). The calculation results based on the Scheil–Gulliver model in the Thermo-Calc software combining with the thermal stability experiments show that the large phases precipitate during the solidification process. With the development of solidification, the Ti-V-rich phase precipitates first and becomes homogeneous during the subsequent temperature reduction and heat treatment processes. The Nb-rich phase appears later.
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