Journal
MATERIALS RESEARCH LETTERS
Volume 3, Issue 2, Pages 88-94Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/21663831.2014.968680
Keywords
Ultrafine Grains; Dislocations; Twins; Stacking Faults; Strength and Ductility
Categories
Funding
- National Natural Science Foundation of China [11172187, 11172188]
- Program for New Century Excellent Talents in University [NCET-12-0372]
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An ideal ultrafine-grained (UFG) microstructure for high strength and high ductility should have short dislocation-slip path to impede dislocation slip and very low dislocation density to ensure more room for dislocation accumulation. Such a microstructure is hard to produce, especially for UFG metals produced by severe plastic deformation techniques. Here, we report an ideal UFG structure produced by reverse transformation of deformation-induced martensite in 304 L austenitic stainless steel. It produced small grains and a high density of nanotwins for both high strength and high ductility. This approach is applicable to face-centered cubic metals with low stacking fault energy.
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