Microstructure and mechanical properties of solid state recycled 4Cr5MoSiV (H11) steel prepared by powder metallurgy

Bhatta, Gyanendra; Valladares, L. De Los Santos; Liu, Xinggang; Ma, Zhaojun; Domínguez, A.; Moreno, N. O.; Suárez, Silvia; Barnes, Colin; Zhang, Deliang

doi:10.1016/j.rinma.2021.100184

Cited by 3 publications

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“…During this process, iron ore fines, sponge iron fines and steel scale are released from the surface billets that are not used because they are very small particles. [2,3].…”

Section: Introductionmentioning

confidence: 99%

Carbothermal reduction of mill scales formed on steel billets during continuous casting

et al. 2021

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A billet is a bar made from crude steel which surface contains scales which are rich in iron oxides. This study presents the carbothermal reduction of the scales formed in steel billets. The process included the reaction of the iron oxides contents with carbon (in ratio 5:1) and annealing in a tubular furnace under argon atmosphere. The occurred reactions are discussed using thermodynamic calculations and thermal analysis which indicate a three-stage reduction process Fe3O4 ➔ FeO ➔ Fe3C ➔α-Fe with intermediate reactions at the interval temperature 960 and 1300 °C. The X-ray diffraction confirms the reduction to α-Fe with minor presence of unreacted C, magnetite and wustite. Mössbauer spectroscopy analysis was performed at room temperature where a typical sextet corresponding to the dominant α-Fe is shown as well as wustite, magnetite and cementite to a lesser extent. The magnetization measurements confirm the ferromagnetic state corresponding to the α-Fe.

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“…During this process, iron ore fines, sponge iron fines and steel scale are released from the surface billets that are not used because they are very small particles. [2,3].…”

Section: Introductionmentioning

confidence: 99%