Acta Metallurgica Sinica (English Letters) ›› 2019, Vol. 32 ›› Issue (3): 352-360.DOI: 10.1007/s40195-018-0796-3
Special Issue: 2019年钢铁材料专辑
• Orginal Article • Previous Articles Next Articles
Hai-Cun Yu1, Zhao-Zhen Cai1(), Gui-Qin Fu1, Miao-Yong Zhu1
Received:
2018-05-11
Revised:
2018-07-02
Online:
2019-03-10
Published:
2019-02-22
Hai-Cun Yu, Zhao-Zhen Cai, Gui-Qin Fu, Miao-Yong Zhu. Effect of V-Ti Addition on Microstructure Evolution and Mechanical Properties of Hot-Rolled Transformation-Induced Plasticity Steel[J]. Acta Metallurgica Sinica (English Letters), 2019, 32(3): 352-360.
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Steel | C | Mn | Al | V | Ti | P | S | N |
---|---|---|---|---|---|---|---|---|
Free-V-Ti | 0.13 | 6.22 | 1.38 | - | - | ≤ 0.04 | ≤ 0.04 | 0.004 |
Bear-V-Ti | 0.13 | 6.24 | 1.37 | 0.072 | 0.051 | ≤ 0.04 | ≤ 0.04 | 0.004 |
Table 1 Chemical composition of two experimental steels (wt%)
Steel | C | Mn | Al | V | Ti | P | S | N |
---|---|---|---|---|---|---|---|---|
Free-V-Ti | 0.13 | 6.22 | 1.38 | - | - | ≤ 0.04 | ≤ 0.04 | 0.004 |
Bear-V-Ti | 0.13 | 6.24 | 1.37 | 0.072 | 0.051 | ≤ 0.04 | ≤ 0.04 | 0.004 |
Fig. 2 Thermodynamics calculations for Free-V-Ti steel and Bear-V-Ti steel based on TCFE7 database of Thermo-Calc: a C content in austenite; b Mn content in austenite; c Al content in austenite; d predicted fraction of retained austenite as a function of temperature
Fig. 5 TEM micrographs of Bear-V-Ti after heat-treated at 650 °C, followed by tempering at 200 °C: a bright-field image; b dark-field image; c morphologies of precipitates; d EDS analysis results of small precipitates
Fig. 6 Mechanical properties of hot-rolled samples: a true strain-stress curves of Free-V-Ti steel; b true strain-stress curves of Bear-V-Ti steel; c UTS and TEL of Free-V-Ti steel; d UTS and TEL of Bear-V-Ti steel
Fig. 7 Measured austenite fractions of undeformed and fractured samples and austenite transformation ratio at 600 °C, 650 °C, 700 °C, and 750 °C: a XRD patterns of Bear-V-Ti steel at 650 °C; b XRD patterns of Free-V-Ti steel at 650 °C; c measured austenite fractions; d austenite transformation ratio
Fig. 8 Tensile properties and micrographs of hot-rolled samples: a yield strength of Free-V-Ti steel and Bear-V-Ti steel; b UTS × TEL of Free-V-Ti steel and Bear-V-Ti steel; c OM micrograph of Free-V-Ti steel at 650 °C; d OM micrograph of Bear-V-Ti steel at 650 °C
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