High-speed Continuous Equal Channel Angular Pressing of 316 LVM stainless steel

• Published in: Materials letters Vol. 304; p. 130631
• Main Authors: Lowe, Terry C., Davis, Skyler L., Campbell, Connor R., Miles, Kevin P., LeBeau, Matthew A., Buk, Gwyneth P., Griebel, Adam J., Ewing, Benjamin R.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.12.2021; Elsevier BV
• Subjects: Alloy manufacturing; Billets; Edge dislocations; Equal channel angular pressing; High shear deformation processing; High speed; Materials science; Mechanical properties; Shear bands; Shear deformation; Stainless steel; Stainless steels; Ultrafine grain; High shear deformation processing; Alloy manufacturing; Ultrafine grain; Stainless steel
• ISSN: 0167-577X; 1873-4979
• DOI: 10.1016/j.matlet.2021.130631

•Demonstrated high shear deformation of stainless steel at industrial speeds.•Determined conditions for stable high shear deformation processing.•Observed that sub-micron grains resist shear instability.•Achieved strengths above 1 GPa while exceeding 20% elongation to failure. ContinuousEqual Channel Angular Pressing (C-ECAP) is aHigh Shear Deformation (HSD) processingmethodthat has been shown to improve the mechanical properties of many alloys.While laboratory-scale ECAP machines have successfully produced microstructures that enhance strength and other properties, theirslowprocessing rate is a barrier to their widespread adoption by themetals productionindustry. To determine the viability of high-speed HSD production of a commercial alloy, 316 LVM stainless steel was subject to C-ECAP at speeds up to 42.5 mm/second to produce billets with repeatable tensile strengths exceeding 1000 MPa. The high-rate shear induced intersecting shear bands but they did not develop into shear cracks.