Comparison of residual microstructures associated with impact craters in fcc stainless steel and bcc iron targets: the microtwin versus microband issue

• Published in: Acta materialia Vol. 50; no. 1; pp. 121 - 131
• Main Authors: Murr, L.E., Trillo, E.A., Bujanda, A.A., Martinez, N.E.
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 08.01.2002; Elsevier Science
• Subjects: Applied sciences; Cold working, work hardening; annealing, post-deformation annealing, quenching, tempering recovery, and crystallization; Cold working, work hardening; annealing, quenching, tempering, recovery, and recrystallization; textures; Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; Impact craters; Iron; Materials science; Metals. Metallurgy; Physics; Steels (austenite); Transmission electron microscopy (TEM); Treatment of materials and its effects on microstructure and properties; Steels (austenite); Iron; Transmission electron microscopy (TEM); Impact craters; Deformation band; Austenitic stainless steel; FCC lattices; Electron diffraction; Twinning; Experimental study; Mechanical treatment; Transmission electron microscopy; BCC lattices; Steels; Microstructure; Stainless steel-304L; Sheets
• ISSN: 1359-6454; 1873-2453
• DOI: 10.1016/S1359-6454(01)00334-2

Deformation microtwins characteristic of Neumann bands dominate the residual microstructures beyond a dynamic recrystallization and highly deformed regime below the crater wall of impact craters in polycrystalline bcc iron targets impacted by 3.2 mm diameter iron projectiles at velocities ranging from 0.5 to 3.8 km s −1. Corresponding impact craters in polycrystalline fcc 304L stainless steel targets impacted by 3.2 mm diameter stainless steel projectiles at velocities ranging from 0.5 to 3.9 km s −1 were observed to have a more limited dynamic recrystallization zone at the crater wall followed by a highly deformed transition into a region of mostly microtwins, but with some intermixing of grains containing microbands.