Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 575, Issue -, Pages 30-34Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2013.03.033
Keywords
Friction stir processing; Steel; Dual phases; Ultrafine grained microstructure
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Funding
- National Natural Science Foundation of China [50890171, 51071150]
- National Basic Research Program of China [2011CB606301]
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Ultrafine dual-phase structure was successfully prepared in a plain low carbon steel via friction stir processing (FSP) at a tool rotation rate of 400 rpm and a travel speed of 50 mm/min under rapid water cooling. Ultrafine polygonal ferrite grains (similar to 1 mu m) were distributed around the martensite phase consisting of nanostructured laths with a width of similar to 200 nm. FSP steel exhibited a good combination of ultrahigh yield strength of similar to 1100 MPa and large uniform elongation of similar to 7%. This work provides an effective strategy to prepare high strength low carbon steels. (C) 2013 Elsevier B.V. All rights reserved.
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