Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 662, Issue -, Pages 456-467Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2016.03.097
Keywords
AISI 304 stainless steel; Electropulsing; Ultrasonic surface rolling process; Refined grain; Deformation twin; Martensite
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Funding
- Science & Technology Research Funding Project of Guangdong Province [2014B090901029]
- Key Enterprises & Innovation Institutes Supporting Funding Project of Nanshan District of Shenzhen City [KC2015ZDYF0021A]
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The present work integrates 3D digital optical microscopy (OM), nano-indentation, X-ray diffraction (XRD), scanning electron microscopy (SEM) with electron backscatter diffraction (EBSD) and transmission electron microscopy (TEM) to systematically investigate the effect of electropulsing on the surface mechanical properties and microstructure of AISI 304 stainless steel during the ultrasonic surface rolling process (USRP). Compared with the original USRP, the introduction of electropulsing with optimal parameters can effectively facilitate surface crack healing and improve surface hardness and wear resistance dramatically, and the residual compressive stress is further enhanced. Meanwhile, more martensite phase and fewer deformation twins can be found in the strengthened layer. Rapid improvement of the surface mechanical properties should be attributed to the ultra-refined grains, accelerated martensitic phase transformation and suppressed deformation twining induced by the coupling effect of USRP and electropulsing. The high strain rate given by USRP, increased stacking fault energy and accelerated dislocation mobility caused by electropulsing are likely the primary intrinsic reasons for the observed phenomena. (C) 2016 Elsevier B.V. All rights reserved.
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