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Home  >  Journal list  >  MATERIALS TRANSACTIONS  >  Vol.58  No.11 (2017)  >  pp.1519-1523

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Influence of Electron Beam Irradiation on Surface Roughness of Commercially AISI 5140 Steel

Hongbin Xu1), Jianjun Hu1) 2), Chaoping Ma2), Linjiang Chai2), Ning Guo3) 4)
1) Mould Technology Chongqing Municipal Key Laboratory of Institutions of Higher Education 2) College of Material Science and Engineering, Chongqing University of Technology 3) Faculty of Materials and Energy, Southwest University 4) Department of Mechanical and Materials Engineering, Queen's University

In this study, a commercially AISI 5140 steel with two different levels of initial surface state (initial high-roughness (IHR) and initial low-roughness (ILR)) was surface-treated by large-area pulsed electron beam irradiation (LPEBI). Surface morphology in 2D and 3D of the two types of samples after LPEBI treatment was characterized. The results show that the surface roughness of IHR samples decreases clearly with increasing LPEBI pulse numbers, while an opposite trend is found in the ILR samples. It is considered that the final surface roughness is influenced by surface remelting and formation of crater-like structures (CLSs) in local regions. For the IHR samples with amounts of mechanical scratches, the remelting plays the leading role, owing to the high surface energy which provides extra driving force for remelting during LPEBI. In contrast, such extra driving force is less due to the relatively flat surface of the ILR samples, instead remelting the surface suffers from the formation of CLSs in localized region. Compared to the formation of localized CLSs, the surface remelting is beneficial to surface roughness of the LPEBI processed samples.

AISI 5140 steel, surface roughness, surface treatment, electron beam irradiation

Received: March 16, 2017
Accepted: August 14, 2017 , Published online: October 25, 2017



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