Journal
VACUUM
Volume 87, Issue -, Pages 60-68Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.vacuum.2012.03.061
Keywords
Low Energy High Current Pulsed Electron Beam (LEHCPEB); AISI D2 steel; Residual stress; Phase transformation
Funding
- Leading Academic Discipline Project of the Shanghai Education Commission [J51402]
- Special Foundation of the Shanghai Education Commission for Nano-Materials Research [1052nm05000]
- National Natural Science Foundation [51101096]
- Service des Relations Internationales from the University Paul Verlaine Metz
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The quantitative evolution of the residual stress states in the surface layers of an AISI D2 steel after Low Energy High Current Pulsed Electron Beam (LEHCPEB) treatment has been investigated by using X-ray diffraction technique. The initial material contained mainly ferrite plus carbides and the ferrite had a compressive stress of about 560 MPa. After the LEHCPEB treatment, the residual stress of the ferrite in the surface layers became tensile in nature, reaching values as high as 730 MPa. A residual tensile stress also existed in the austenite formed at the surface. The stress increased from 170 MPa after 5 pulses to 700 MPa after 25 pulses of treatment. The evolution of the residual stress state in the surface layers can be explained by taking into account the fast thermal cycle, deformations induced by the dynamic thermal stress at the surface together with melting and phase transformations generated by the LEHCPEB treatment. (C) 2012 Elsevier Ltd. All rights reserved.
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