Effect of Boron Concentration on Dynamic Recrystallization Behavior of Low-Carbon Steel

doi:10.1007/s40195-015-0278-9

Abstract

Abstract:

The dynamic recrystallization behavior of low-carbon steel containing three different amounts of boron (0.002, 0.004, and 0.006 wt%) was systematically investigated under various experimental conditions. Low-carbon steel was exposed to temperatures ranging from 900 to 1100 °C, strain rates from 0.1 to 10 s^-1, and inspection of the initial austenite grain size at 1150 °C. The resulting stress-strain curves are observed to possess two classifications of behavior, dynamic recovery and dynamic recrystallization, while the initial austenite grain size increases directly proportional to boron concentration. Additionally, the characteristic points of the flow curves were analyzed by regression method in which the peak and critical stresses decreased in response to an increase in boron composition, indicating that a softening effect appears with the addition of boron. On the contrary, peak and critical strains increased as boron content increased, indicating that boron has the ability to delay the onset of dynamic recrystallization. Lastly, the kinetics model of dynamic recrystallization for three boron-treated steels was established.

Key words: Boron-treated, steel, Hot, deformation, Flow, stress, Dynamic, recrystallization

Yong-Liang Gao, Xiang-Xin Xue, He Yang. Effect of Boron Concentration on Dynamic Recrystallization Behavior of Low-Carbon Steel[J]. Acta Metallurgica Sinica (English Letters), 2015, 28(7): 931-939.

Figures/Tables 10

Table 1 Chemical composition of the test steels (wt%)

Steels	C	Si	Mn	S	P	Al	B	N	Fe
B1	0.18	0.184	0.619	0.025	0.016	0.051	0.002	0.004	Bal.
B2	0.18	0.191	0.626	0.025	0.016	0.049	0.004	0.004	Bal.
B3	0.18	0.196	0.626	0.025	0.016	0.049	0.006	0.004	Bal.

Fig. 1 Stress-strain curves as a function of boron content (B1, B2, and B3) at different temperatures (900, 950, 1000, 1050, and 1100 °C) and strain rates (0.1, 1, and 10 s-1)

Fig. 2 Typical curve of θ-σ showing the four phases dividing a, and the plots of θ-σ at 0.1 s-1 and different temperatures for steel B1 b, steel B2 c, steel B3 d

Fig. 3 Curves of -(dθ/dσ)-σ at strain rate 0.1 s-1 and different temperatures: a steel B1, b steel B2, c steel B3

Fig. 4 Critical DRX parameters versus temperature at 0.1 s-1: a peak stress, b critical stress, c peak strain, d critical strain

Fig. 5 Critical DRX parameters versus temperature at 1 s-1: a peak stress, b critical stress, c peak strain, d critical strain

Fig. 6 Austenite grain size of the specimens at austenitizing temperature of 1150 °C: a steel B1, b steel B2, c steel B3

Fig. 7 ΔG θ of producing AlN and BN at different temperatures

Fig. 8 ln[-ln(1 - X d)] versus ln[(ε - ε c)/ε p] under different deformation conditions: a steel B1, b steel B2, c steel B3

Fig. 9 Predicted volume fractions of dynamic recrystallization at temperature 1000 °C and strain rate 0.1 s-1

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