A high specific Young’s modulus steel reinforced by spheroidal kappa-carbide

Chen, P.; Fu, Jian; Xu, Xiaoguang; Lin, Chuang; Pang, J. C.; Li, X.W.; Misra, R.D.K.; Wang, G.D.; Yi, Hong

doi:10.1016/j.jmst.2021.01.033

Cited by 5 publications

(15 citation statements)

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“…According to the previous study [4], the high specific Young's modulus steels could be obtained by introducing κ-carbides as reinforcement in the ferrite matrix. Even though the stequiometry of κ-carbide measured in experiments has somewhat of deviation with the ideal formula (Fe 3 AlC) [10,[18][19][20][21], the carbon and aluminum are the major elements.…”

Section: Resultsmentioning

confidence: 99%

“…Hot-rolled alloys A, B and C exhibit the tensile elongation of 0.86%, 5.5% and 1.91%, respectively. For improving the ductility of hot-rolled steels, DET treatment was adopted here, which includes austenization and subsequently slow cooling to below A c1 temperature followed by fast cooling to ambient temperature [4]. The DET treatment leads to a softer microstructure of spherical κ-carbide particles in a ferrite matrix.…”

Section: Resultsmentioning

confidence: 99%

“…The chemical compositions of experimental steels are listed in Table 1. The Young's moduli of experimental steels were calculated using the mixture formula [4,16]:…”

Section: Methodsmentioning

confidence: 99%

“…The concept of high specific Young's modulus steel was proposed on the basic of ferrite matrix with ceramic particle reinforcement [2,3]. A high specific Young's modulus steel has been designed by the κ-carbide introducing in ferrite matrix as a reinforcement [4]. Besides, an efficiency divorced transformation (DET) heat treatment was adopted to solve the high brittleness problem of κ-pearlite (lamellar κ-carbide plus ferrite) [2,[5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

“…The DET process involves austenitizing for carbide particles in austenite matrix, and subsequently slow cooling (and isothermal holding) to obtain spheroidal pearlite. During the cooling (and isothermal holding) process, the undissolved particles grow accompanied with the migration of ferrite/austenite interfaces [4]. After a DET treatment, the ductility was significantly improved through the evolution of κ-carbide from lamellar into spheroidal shape [2].…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Controlling Carbide Evolution to Improve the Ductility in High Specific Young’s Modulus Steels

Chen

et al. 2022

Acta Metall. Sin. (Engl. Lett.)

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A high specific Young's modulus steel could be achieved by introducing a large fraction of kappa-carbides (κ-carbide), and its ductility was improved by efficiency divorced eutectoid transformation (DET) treatment. For this steel, carbon and aluminum contents affect not only the carbide fraction, but also the type and morphology of carbides, and consequently the mechanical properties. In this work, the alloy was designed by considering both the carbide morphology and Young's modulus, and the carbides in the high specific Young's modulus steels were adjusted by controlling carbon content in a suitable range for achieving a good combination of strength and ductility. The detailed microstructure evolution process during DET reaction was studied, and it was found that a higher austenitizing temperature and the cooling rate lower than 300 ℃ h −1 are suitable. The blocky carbides could be avoided by designing the carbon content in a limited content range. The microstructure-property relationship of the experimental steels was also discussed for giving an impetus to the future development of high specific Young's modulus steels.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

“…The chemical compositions of experimental steels are listed in Table 1. The Young's moduli of experimental steels were calculated using the mixture formula [4,16]:…”

Section: Methodsmentioning

confidence: 99%