高精度FE-EPMAによる低炭素鋼の初析フェライト変態初期における炭素の分配
Understanding of γ→α transformation during intercritical annealing is important to achieve precise control over the mechanical properties of low-carbon steels. And control of the carbon contents in the phases is the most important factor in alloy design for achieving high strength and high ductility...
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| Published in | 鉄と鋼 Vol. 103; no. 11; pp. 622 - 628 |
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| Main Authors | , , , , |
| Format | Journal Article |
| Language | Japanese |
| Published |
一般社団法人 日本鉄鋼協会
2017
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| Subjects | |
| Online Access | Get full text |
| ISSN | 0021-1575 1883-2954 |
| DOI | 10.2355/tetsutohagane.TETSU-2017-025 |
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| Abstract | Understanding of γ→α transformation during intercritical annealing is important to achieve precise control over the mechanical properties of low-carbon steels. And control of the carbon contents in the phases is the most important factor in alloy design for achieving high strength and high ductility. However, it is unusually difficult to determine the carbon contents in multiphase structures with high accuracy. So, we have developed new methods for suppressing hydrocarbon contamination during field emission (FE) EPMA measurements.Carbon enrichment at γ/α interface and carbon concentration of γ phase in Fe-0.15%C-2%Si-(1.5, 2.0)%Mn steels isothermally transformed at 750 and 800°C was measured using developed FE-EPMA. The paraequilibrium (PE) model gives much better predictions for carbon enrichment in 1.5%Mn steel for 15 s. The NPLE/PLE transition model of local equilibrium gives much better predictions in 2.0%Mn steel. But the interfacial carbon concentration agrees with the composition of PLE/NPLE transition line in all alloys annealing for 1800 s. Furthermore, carbon enrichment shifted from the PE to NPLE model during annealing. |
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| AbstractList | Understanding of γ→α transformation during intercritical annealing is important to achieve precise control over the mechanical properties of low-carbon steels. And control of the carbon contents in the phases is the most important factor in alloy design for achieving high strength and high ductility. However, it is unusually difficult to determine the carbon contents in multiphase structures with high accuracy. So, we have developed new methods for suppressing hydrocarbon contamination during field emission (FE) EPMA measurements.Carbon enrichment at γ/α interface and carbon concentration of γ phase in Fe-0.15%C-2%Si-(1.5, 2.0)%Mn steels isothermally transformed at 750 and 800°C was measured using developed FE-EPMA. The paraequilibrium (PE) model gives much better predictions for carbon enrichment in 1.5%Mn steel for 15 s. The NPLE/PLE transition model of local equilibrium gives much better predictions in 2.0%Mn steel. But the interfacial carbon concentration agrees with the composition of PLE/NPLE transition line in all alloys annealing for 1800 s. Furthermore, carbon enrichment shifted from the PE to NPLE model during annealing. |
| Author | 山下, 孝子 名越, 正泰 田中, 裕二 榎本, 正人 松田, 広志 |
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| SubjectTerms | high tensile steel intercritical annealing local equilibrium paraequilibrium phase diagram phase transformation thermodynamics |
| Title | 高精度FE-EPMAによる低炭素鋼の初析フェライト変態初期における炭素の分配 |
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