马立国, 郭大勇, 王秉喜, et al. Measurement and Analysis on Dynamic Continuous Cooling Transformation Curves of Casting Bloom of Alloy Cold-Heading Steel 10B21[J]. Special Steel, 2018, 39(3): 47-50.
马立国, 郭大勇, 王秉喜, et al. Measurement and Analysis on Dynamic Continuous Cooling Transformation Curves of Casting Bloom of Alloy Cold-Heading Steel 10B21[J]. Special Steel, 2018, 39(3): 47-50.DOI:
The metallurgical process flowsheet of 280 mm x 380 mm casting bloom of steel 10B21 (/% : 0. 19C
0.05Si
0.79Mn
0.017P
0. 002S
0. 17Cr
0.032Ti
0.002 0B
0.025Als) is 100 t BOF-LF-VD-GC. By using Gleeble-3800 thermo-mechanical simulator
the dilatometric curves steel 10B21 with cooling rate 0. 2 〜50 ℃/s has been measured and to combined with thermal dilation method and metallography-hardness method the continuous cooling transformation (CCT) curves are obtained. Results show that with cooling rate 0. 2 〜1 ℃/s the structure of steel is ferrite ( F) and pearlite ( P) ; the cooling rate 5 ~20 ℃/s may be the cooling rate range to form Widmannstatten (W) structure; with >5 ℃,the bainite structure (B) initially occurs in tested steel; with >10 ℃/s
the martensite structure (M) occurs in steel; with > 25 ℃/s the main structure in steel consists of B + M ; and with >50 ℃/s it is obtained M structure in steel.