Acta Metallurgica Sinica (English Letters) ›› 2019, Vol. 32 ›› Issue (10): 1207-1218.DOI: 10.1007/s40195-018-00868-x
Special Issue: 2019年钢铁材料专辑
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Xiao-Hui Wang1, Jian Kang1, Yun-Jie Li1, Guo Yuan1(), R. D. K. Misra2, Guo-Dong Wang1
Received:
2018-08-03
Revised:
2018-10-08
Online:
2019-10-10
Published:
2019-09-17
Xiao-Hui Wang, Jian Kang, Yun-Jie Li, Guo Yuan, R. D. K. Misra, Guo-Dong Wang. Effect of Cooling Rates in Coiling Process on Microstructures and Mechanical Properties in Al-Bearing Hot-Rolled TRIP Steel[J]. Acta Metallurgica Sinica (English Letters), 2019, 32(10): 1207-1218.
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C | Mn | Al | Si | S | P | Fe |
---|---|---|---|---|---|---|
0.218 | 1.52 | 1.10 | 0.547 | 0.004 | 0.027 | Bal. |
Table 1 Chemical composition of the experimental steel (wt%)
C | Mn | Al | Si | S | P | Fe |
---|---|---|---|---|---|---|
0.218 | 1.52 | 1.10 | 0.547 | 0.004 | 0.027 | Bal. |
Fig. 1 Ferrite transformation temperature of the experimental steel in equilibrium and undercooled states: a volume fractions of phases versus temperature; b dilatation versus temperature
Fig. 3 Microstructures of the experimental steel cooled from 400 °C at different cooling rates: a 0.05 °C/s; b 0.1 °C/s; c 0.5 °C/s; d 1 °C/s; e 5 °C/s; f 10 °C/s. PF is polygonal ferrite, BF is bainitic ferrite, RA is retained austenite and M is martensite
Fig. 4 Carbon distribution of the experimental steel cooled from 400 °C at different cooling rates: a 0.5 °C/s; b 1 °C/s; c 5 °C/s; d 10 °C/s. PF is polygonal ferrite, BF is bainitic ferrite, RA is retained austenite and M is martensite
Fig. 5 EBSD images of the experimental steel cooled from 400 °C at different cooling rates: a 0.5 °C/s; b 1 °C/s; c 5 °C/s; d 10 °C/s. PF is polygonal ferrite, BF is bainitic ferrite, RA is retained austenite and M is martensite
Fig. 6 TEM images of the experimental steel cooled from 400 °C at the cooling rate of 0.05 °C/s: a film-like retained austenite in bright field; b film-like retained austenite in dark field; c film-like retained austenite in SAED pattern; e blocky retained austenite in bright field; f blocky retained austenite in dark field; g blocky retained austenite in SAED pattern. PF is polygonal ferrite, BF is bainitic ferrite and RA is retained austenite
Fig. 7 TEM images of the experimental steel cooled from 400 °C at the cooling rate of 5 °C/s: a martensite in bright field; b martensite in dark field; c martensite in SAED pattern. PF is polygonal ferrite and M is martensite
Fig. 8 TEM images of the experimental steel cooled from 400 °C at the cooling rate of 0.5 °C/s: a martensite/austenite island in bright field; b martensite/austenite island in dark field; c martensite/austenite island in SAED pattern. PF is polygonal ferrite, RA is retained austenite and M is martensite
Fig. 9 Volume fraction and carbon content of retained austenite at different cooling rates: a XRD curves; b austenite diffraction peaks; c the volume fraction of retained austenite; d the carbon content of retained austenite
Fig. 10 Hardness and mechanical properties of the experimental steel at different cooling rates: a hardness of experimental steel; b engineering strain and engineering stress curves; c instantaneous work hardening exponent during dislocations interaction; d instantaneous work hardening exponent during plastic deformation
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