Influence of Cooling Rate and Chemical Composition on Phase Transformation and Hardness of C70S6 Steel

Ji, Yucheng; Zhou, Ning; Sun, Xiao Hang; Jiang, Bo; Xiao, Lei Lei; Liu, Ya Zheng

doi:10.4028/www.scientific.net/msf.898.1202

Cited by 1 publication

(2 citation statements)

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“…Then, the data from Figure 13 can be fit using Equation 7as follows: In Equation (7), dT/dt is the cooling rate, K•s −1 ; and l is the average grain size, μm. The degree of the fit of Equation (7) reached 0.99, so the grain size of M2 steel can be calculated according to the cooling rate through Equation (7). Note that Equation (7) was obtained with the test data, where the cooling rate dT/dt was between 1.05 K/s and 32.6 K/s.…”

Section: The Grain Size Measurementmentioning

confidence: 99%

“…Typical as-cast structure of M2 high speed steel consists of dendrites surrounded by inter-dendritic network of eutectic carbides [3]. The main features of the as-cast structure are the distribution and size of the carbides and dendrites [4][5][6], which have a crucial influence on the mechanical properties of final products [7][8][9]. It is well known that the mechanical properties of high speed steel strongly depend on the carbide type, shape, size and distribution, which are closely related to the as-cast structure of ingots, especially those eutectic carbides.…”

Section: Introductionmentioning

confidence: 99%

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Comparison of the Microstructure of M2 Steel Fabricated by Continuous Casting and with a Sand Mould

Zhang

Zhao

Wang

et al. 2019

Metals

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AISI M2 steel was smelted in a 150 kg medium-frequency induction furnace and cast to form round billets with a cross-section diameter of 100 mm via a vertical continuous caster and sand mold. The secondary dendrite arm spacing (λ2), cooling rates, permeability and size and distribution of grains and network carbides of the two billets were studied. The results show that the continuous casting process can effectively decrease the λ2 value, permeability and size of the grains and carbides and improve the distribution of the grains and carbides during solidification. The λ2 values of the billets cast with a sand mold and continuous caster are 37.34 μm and 21.14 μm, respectively, and the cooling rate is 3.6 K·s−1 and 12.0 K·s−1, respectively. The area fractions of carbides at the center of the billets cast with the sand mold and continuous caster are 0.24 and 0.16, respectively, and increase by 27.7% and 25.4%, respectively, compared with their average values. The average grain size of billets cast with the sand mold and continuous caster is 69.4 μm and 50.5 μm, respectively. Compared with the sand mold billet, the grain size at the center of the continuous casting billet is reduced by 25.5%. The relationship between the grain size and cooling rate is presented in this paper.

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Section: The Grain Size Measurementmentioning

confidence: 99%