Fig. 1: Hydrogen-based direct reduction kinetics and microstructure of reduced iron. | npj Materials Degradation

Fig. 1: Hydrogen-based direct reduction kinetics and microstructure of reduced iron.

From: How much hydrogen is in green steel?

Fig. 1

a Reduction degree of hydrogen-based direct reduction (HyDR) of a hematite pellet at 900 °C. b Phase identification from X-ray diffraction of the HyDR product (M stands for magnetite). c Secondary electron (SE) image of characteristic microstructure of reduced sponge iron. d–g Corresponding elemental maps of Si, Al, Ca, and Mg of (c) probed by energy-dispersive X-ray spectroscopy (EDX). h SE image highlighting a nano-pore. i Electron channeling contrast imaging (ECCI) showing high-angle grain boundaries.

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