Acta Metallurgica Sinica (English Letters) ›› 2017, Vol. 30 ›› Issue (11): 1067-1079.DOI: 10.1007/s40195-017-0632-1
Special Issue: 2017年钢铁材料专辑
• Orginal Article • Previous Articles Next Articles
Xiao-Lin Li1, Cheng-Shuai Lei1, Xiang-Tao Deng1,*(), Yan-Mei Li1, Yong Tian1, Zhao-Dong Wang1,*(), Guo-Dong Wang1
Received:
2017-08-05
Revised:
2017-08-05
Online:
2017-11-20
Published:
2018-01-30
Contact:
Deng Xiang-Tao,Wang Zhao-Dong
Xiao-Lin Li, Cheng-Shuai Lei, Xiang-Tao Deng, Yan-Mei Li, Yong Tian, Zhao-Dong Wang, Guo-Dong Wang. Carbide Precipitation in Ferrite in Nb-V-Bearing Low-Carbon Steel During Isothermal Quenching Process[J]. Acta Metallurgica Sinica (English Letters), 2017, 30(11): 1067-1079.
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Fig. 2 Optical micrographs obtained from dilatometer specimens isothermal holding at a-c 700 °C, d-f 650 °C, and g-i 600 °C for 10, 20, and 60 min, respectively; with plots in displaying variation in the ferrite volume fraction and the grain size versus g isothermal temperature for 10 min, k isothermal time at 650 °C
Fig. 3 a TTT curves of experimental steel simulated by JMatpro simulation, relationship of precipitated phase b corresponding composition of these phases c-e with temperatures
Fig. 4 TEM micrographs showing precipitates with cuboid shape a, b, c spherical shape; the corresponding EDS of precipitate d, e in b, c, respectively
Fig. 5 Schematic of TEM observation about the interphase precipitation carbides (s is the perpendicular sheet spacing; ω is the average intercarbide spacing in the sheet plane; ω 0 is the mean projected value of the intercarbide spacing in sheet)
Fig. 6 a Morphology of row-like sheet plane of the interphase precipitation and the inset is the corresponding diffraction pattern of the ferrite with the zone axis [100] α ; b the morphology of the random dispersion of carbides obtained by tilting the TEM thin foil to the zone axis [210] α and the inset is the corresponding SADP; the random distribution carbides with the zone axis of [110] α and [100] α in the specimen isothermally treated at 700 °C for 60 min
Fig. 7 Morphology of random distributed nanometer-sized carbides in the zone axes of [100] α in specimens isothermally treated at a 600, b 650, c 700 °C for 10 min
Fig. 9 a Representative HRTEM micrograph of nanometer-sized carbide and b plots showing average size and number density of the carbides as a function of isothermal holding temperature
Fig. 11 Size distribution histograms of nanoscale precipitates in the specimens with different isothermal holding times of a 10, b 20, c 60 min at 650 °C, d plots showing variation of precipitation size and fraction as a function of isothermal holding time
Fig. 12 a Typical indentation morphology by nanoindenter, hardness distribution of the specimens isothermally treated at b 600 °C, c 650 °C for 20 min
Fig. 13 a TEM image of interphase precipitation, b HRTEM image of the interphase precipitation and the corresponding FFT diffractograms of nanocarbides obtained from the specimen isothermally treated at 700 °C for 60 min
Sheet plane | 1/sinφ (multiplication: slip plane) | Average value of 1/sinφ |
---|---|---|
(013) | 2.236 (1: (011)) | 2.429 ± 0.286 |
2.335 (2: (112) and ($\bar{1}$12)) | ||
2.715 (2: (123) and ($\bar{1}$23)) |
Table 1 Value of 1/sinφ obtained from the lowest φ for (013) plane
Sheet plane | 1/sinφ (multiplication: slip plane) | Average value of 1/sinφ |
---|---|---|
(013) | 2.236 (1: (011)) | 2.429 ± 0.286 |
2.335 (2: (112) and ($\bar{1}$12)) | ||
2.715 (2: (123) and ($\bar{1}$23)) |
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