Physical Interpretation of Grain Refinement-induced Variation in Fracture Mode in Ferritic Steel

Qiu, Hai; Wang, Linning; Hanamura, Toshihiro; Torizuka, Shiro

doi:10.2355/isijinternational.53.382

Cited by 8 publications

(7 citation statements)

References 12 publications

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“…Adopting effective measures to promote the columnar to equiaxed transition (CET) during the solidification stage of steel have attracted much attention. [1][2][3] Among the methods of promoting CET, [4][5][6][7] stirring of the melt by time-varying magnetic fields is particularly attractive due to the completely contactless feature and flexible tailoring of the magnetic fields themselves. [8][9][10][11] The flow induced by the melt stirring can penetrate the mushy zone, remelt the dendrite arms and decrease the temperature gradient in the melts, thus favoring the CET.…”

Section: Introductionmentioning

confidence: 99%

Columnar to Equiaxed Transition during Directionally Solidifying GCr18Mo Steel Affected by Thermoelectric Magnetic Force under an Axial Static Magnetic Field

et al. 2019

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The effects of an axial static magnetic field (ASMF) on the columnar to equiaxed transition (CET) during directionally solidifying GCr18Mo steel were investigated by experiment and numerical simulation. Experimental results show that the CET has been promoted by the increases of the magnetic field intensity and temperature gradient and the decrease of the growth speed. The corresponding numerical simulations verify that a thermoelectric magnetic convection in the melts and a thermoelectric magnetic force acting on the secondary dendrite neck are produced by the interaction between ASMF and a thermoelectric current. Compared the experimental results with the numerical simulations, the mechanism for the CET with ASMF demonstrates that the application of ASMF contributes to the transport of the fragments in the melts and detachment of dendritic side arms. Based on these results, we propose a process window for the CET of GCr18Mo steel with ASMF.

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Section: Introductionmentioning

confidence: 99%

Columnar to Equiaxed Transition during Directionally Solidifying GCr18Mo Steel Affected by Thermoelectric Magnetic Force under an Axial Static Magnetic Field

et al. 2019

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“…Steels with a fine-grain structure, associated with excellent mechanical properties, are the ultimate goal of the entire manufacturing process, especially in the solidification process [1][2][3][4]. It plays a significant role in the hot-soak and hot rolling of the steel [5].…”

Section: Introductionmentioning

confidence: 99%

Grain Refinement During Directionally Solidifying GCr18Mo Steel at Low Pulling Speeds Under an Axial Static Magnetic Field

Hou

Zhang

Wang

et al. 2017

Acta Metall. Sin. (Engl. Lett.)

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The present work investigates how axial static magnetic field affects the solidification structure and the solute distribution in directionally solidified GCr18Mo steel. Experimental results show that grain refinement and the columnar to equiaxed transition is enhanced with the increases in the magnetic field intensity (B) and temperature gradient (G) and the decrease in the growth speed. This phenomenon is simultaneously accompanied by more uniformly distributed alloying elements. The corresponding numerical simulations verify a thermoelectric (TE) magnetic convection pattern in the mushy zone due to the interaction between the magnetic field and TE current. The TE magnetic convection in the liquid should be responsible for the motion of dendrite fragments. The TE magnetic force acting on the dendrite is one of the driving forces trigging fragmentation.Keywords GCr18Mo steel Á Grain refinement Á Axial static magnetic field Á Columnar to equiaxed transition Á Thermoelectric magnetic force Acta Metallurgica Sinica (English Letters) (2018) 31:681-691 https://doi.org/10.1007/s40195-017-0691-3( 0123456789().,-volV) (0123456789().,-volV)

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“…Equations (1)- (3) demonstrate that the finer the ferrite grain, the higher the toughness of ferrite matrix steel in the three fracture modes. However, Qiu et al 11) physically analyzed the grain refinement-induced variation in fracture mode with stress-controlled and strain-controlled models. Their results showed that grain refinement elevates the toughness of ferritic steel only in the completely brittle or brittle/ductile fracture region.…”

Section: Introductionmentioning

confidence: 99%

“…Dependence of yield strength on ferrite grain size. Dependence of fracture strain on ferrite grain size 11). Load against clip gage displacement in the CTOD tests for the specimens of the 0.10C steel with ferrite grain size of 0.9 μm, 4.6 μm, 6.2 μm, and 9.6 μm.…”

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confidence: 99%

Influence of Grain Size on the Ductile Fracture Toughness of Ferritic Steel

2014

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The ductile fracture toughness of ferritic steel was assessed in terms of crack tip opening displacement (CTOD). The CTOD is composed of two parts: elastic and plastic. In the ductile fracture region, as compared to the elastic part, the fraction of the plastic part is dominant. The CTOD linearly increases with an increase in ferrite grain size, but grain coarsening simultaneously increases the possibility of cleavage fracture. As yield strength increases, the CTOD decreases due to the decreased plastic deformation ability.

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Physical Interpretation of Grain Refinement-induced Variation in Fracture Mode in Ferritic Steel

Cited by 8 publications

References 12 publications

Columnar to Equiaxed Transition during Directionally Solidifying GCr18Mo Steel Affected by Thermoelectric Magnetic Force under an Axial Static Magnetic Field

Columnar to Equiaxed Transition during Directionally Solidifying GCr18Mo Steel Affected by Thermoelectric Magnetic Force under an Axial Static Magnetic Field

Grain Refinement During Directionally Solidifying GCr18Mo Steel at Low Pulling Speeds Under an Axial Static Magnetic Field

Influence of Grain Size on the Ductile Fracture Toughness of Ferritic Steel

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