From the microstructure of steels to the explosion of sparks Anthony Guillen, Fang Goh, Julie Andre, Amaury Barral, Clement Brochet, Quentin Louis and Thibault Guillet Emergent Scientist, 3 (2019) 2 Published online: 12 February 2019 DOI: 10.1051/emsci/2019001