Effects of soaking time on the microstructure and mechanical properties of Nb-NbC/Fe core–shell rod-reinforced cast-iron-matrix composite fabricated through two-step in situ solid-phase diffusion
To overcome the disadvantages of low toughness of conventional particle reinforced steel/iron-based composites, a novel niobium-niobium carbide/iron (Nb-NbC/Fe) core–shell rod-reinforced cast-iron-matrix composites were fabricated through two-step in situ solid-phase diffusion at 1172 °C for 15 min,...
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| Format: | Article |
| Language: | English |
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Elsevier
2020-11-01
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| Series: | Journal of Materials Research and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785420316987 |
| _version_ | 1818950672512450560 |
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| author | Lisheng Zhong Junzhe Wei Haiqiang Bai Jianlei Zhu Yunhua Xu |
| author_facet | Lisheng Zhong Junzhe Wei Haiqiang Bai Jianlei Zhu Yunhua Xu |
| author_sort | Lisheng Zhong |
| collection | DOAJ |
| description | To overcome the disadvantages of low toughness of conventional particle reinforced steel/iron-based composites, a novel niobium-niobium carbide/iron (Nb-NbC/Fe) core–shell rod-reinforced cast-iron-matrix composites were fabricated through two-step in situ solid-phase diffusion at 1172 °C for 15 min, followed by heat treatment at 1120 °C for 1, 4, 7, and 10 h (1172 °C × 15 min + 1120 °C × (1, 4, 7, 10 h)). The effects of soaking time on the microstructure and mechanical properties of the composites were investigated. Results indicated that the phase composition of the Nb-NbC/Fe core–shell rod-reinforced cast-iron-matrix composites were NbC, Nb, α-Fe and, graphite (G) phases, where Nb existed as core at the center surrounded by NbC/Fe shell. With the extension of the soaking time, the phase composition of the composites did not change, but the thickness of the NbC/Fe shell increased from 90 ± 3 μm to 233 ± 5 μm. The average hardness of the NbC/Fe shell was 12.86 GPa, which was approximately 2.6 times than that of the cast-iron-matrix due to high volume fraction of NbC particles. The yield strength and strain of the composite prepared at 7 h reached the maximum value of 1794.4 MPa and 11.6%, respectively. The excellent yield strength was attributed mostly to NbC particles, which induced the load-transfer strengthening and the mismatch of thermal-expansion-coefficient strengthening. Meanwhile, the Nb and α-Fe effectively hindered microcrack propagation, which contributed to the reasonable plasticity of the composite. |
| first_indexed | 2024-12-20T09:22:19Z |
| format | Article |
| id | doaj.art-a9183d8741da47f6b04dbcf1dc7d7b3b |
| institution | Directory Open Access Journal |
| issn | 2238-7854 |
| language | English |
| last_indexed | 2024-12-20T09:22:19Z |
| publishDate | 2020-11-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj.art-a9183d8741da47f6b04dbcf1dc7d7b3b2022-12-21T19:45:16ZengElsevierJournal of Materials Research and Technology2238-78542020-11-01961230812317Effects of soaking time on the microstructure and mechanical properties of Nb-NbC/Fe core–shell rod-reinforced cast-iron-matrix composite fabricated through two-step in situ solid-phase diffusionLisheng Zhong0Junzhe Wei1Haiqiang Bai2Jianlei Zhu3Yunhua Xu4School of Material Science and Engineering, Xi’an University of Technology, Xi’an 710048, China; International Research Center for Composite and Intelligent Manufacturing Technology, Xi’an University of Technology, Xi’an 710048, China; Corresponding author.School of Material Science and Engineering, Xi’an University of Technology, Xi’an 710048, China; International Research Center for Composite and Intelligent Manufacturing Technology, Xi’an University of Technology, Xi’an 710048, ChinaSchool of Material Science and Engineering, Xi’an University of Technology, Xi’an 710048, China; International Research Center for Composite and Intelligent Manufacturing Technology, Xi’an University of Technology, Xi’an 710048, ChinaSchool of Material Science and Engineering, Xi’an University of Technology, Xi’an 710048, China; International Research Center for Composite and Intelligent Manufacturing Technology, Xi’an University of Technology, Xi’an 710048, ChinaSchool of Material Science and Engineering, Xi’an University of Technology, Xi’an 710048, China; International Research Center for Composite and Intelligent Manufacturing Technology, Xi’an University of Technology, Xi’an 710048, ChinaTo overcome the disadvantages of low toughness of conventional particle reinforced steel/iron-based composites, a novel niobium-niobium carbide/iron (Nb-NbC/Fe) core–shell rod-reinforced cast-iron-matrix composites were fabricated through two-step in situ solid-phase diffusion at 1172 °C for 15 min, followed by heat treatment at 1120 °C for 1, 4, 7, and 10 h (1172 °C × 15 min + 1120 °C × (1, 4, 7, 10 h)). The effects of soaking time on the microstructure and mechanical properties of the composites were investigated. Results indicated that the phase composition of the Nb-NbC/Fe core–shell rod-reinforced cast-iron-matrix composites were NbC, Nb, α-Fe and, graphite (G) phases, where Nb existed as core at the center surrounded by NbC/Fe shell. With the extension of the soaking time, the phase composition of the composites did not change, but the thickness of the NbC/Fe shell increased from 90 ± 3 μm to 233 ± 5 μm. The average hardness of the NbC/Fe shell was 12.86 GPa, which was approximately 2.6 times than that of the cast-iron-matrix due to high volume fraction of NbC particles. The yield strength and strain of the composite prepared at 7 h reached the maximum value of 1794.4 MPa and 11.6%, respectively. The excellent yield strength was attributed mostly to NbC particles, which induced the load-transfer strengthening and the mismatch of thermal-expansion-coefficient strengthening. Meanwhile, the Nb and α-Fe effectively hindered microcrack propagation, which contributed to the reasonable plasticity of the composite.http://www.sciencedirect.com/science/article/pii/S2238785420316987Nb-NbC/Fe core–shell rodCast-iron-matrix compositesTwo-step in situ solid-phase diffusionMicrostructureMechanical properties |
| spellingShingle | Lisheng Zhong Junzhe Wei Haiqiang Bai Jianlei Zhu Yunhua Xu Effects of soaking time on the microstructure and mechanical properties of Nb-NbC/Fe core–shell rod-reinforced cast-iron-matrix composite fabricated through two-step in situ solid-phase diffusion Journal of Materials Research and Technology Nb-NbC/Fe core–shell rod Cast-iron-matrix composites Two-step in situ solid-phase diffusion Microstructure Mechanical properties |
| title | Effects of soaking time on the microstructure and mechanical properties of Nb-NbC/Fe core–shell rod-reinforced cast-iron-matrix composite fabricated through two-step in situ solid-phase diffusion |
| title_full | Effects of soaking time on the microstructure and mechanical properties of Nb-NbC/Fe core–shell rod-reinforced cast-iron-matrix composite fabricated through two-step in situ solid-phase diffusion |
| title_fullStr | Effects of soaking time on the microstructure and mechanical properties of Nb-NbC/Fe core–shell rod-reinforced cast-iron-matrix composite fabricated through two-step in situ solid-phase diffusion |
| title_full_unstemmed | Effects of soaking time on the microstructure and mechanical properties of Nb-NbC/Fe core–shell rod-reinforced cast-iron-matrix composite fabricated through two-step in situ solid-phase diffusion |
| title_short | Effects of soaking time on the microstructure and mechanical properties of Nb-NbC/Fe core–shell rod-reinforced cast-iron-matrix composite fabricated through two-step in situ solid-phase diffusion |
| title_sort | effects of soaking time on the microstructure and mechanical properties of nb nbc fe core shell rod reinforced cast iron matrix composite fabricated through two step in situ solid phase diffusion |
| topic | Nb-NbC/Fe core–shell rod Cast-iron-matrix composites Two-step in situ solid-phase diffusion Microstructure Mechanical properties |
| url | http://www.sciencedirect.com/science/article/pii/S2238785420316987 |
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