Evolution of Microstructure at the Surface of 40CrNiMo7 Steel Treated by High-Current Pulsed Electron Beam

Abstract

High current pulsed electron beam (HCPEB) has recently been developed as an effective technique of material surface modification. In this research, a self-developed HCPEB equipment (HOPE-I) was adopted to perform surface modification on quenched and tempered 40CrNiMo7 steel. A composite nanometer structure was formed on the modified surface layer, and the martensite transformation and the dissolution and fracture of cementite can be observed. After initial irradiation, the high cooling rate caused the formation of nanocrystalline on the surface. With continuous irradiation treatments, the cooling rate gradually reduced, while the carbon kept dissolving and ended with surface composition homogenization. Both competitive factors result in the evolution rule of nanometer dimensions of surface structure. After HCPEB treatment, the average size of austenite phase on the modified surface decreased from micron-sized to nanoscale. The corrosion rate decreased from 0.12 mm/a to 0.02 mm/a, showing remarkable improvement of corrosion resistance. The main factors of the improvements of corrosion resistance property are the flat, dense structured and preferred crystal orientation on the modification layer of the treated material surface.

Synthesis and Characterization of Ti-Ta-Shape Memory Surface Alloys Formed by the Electron-Beam Additive Technique

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Duplex surface modification of tool steel - deposition of a WN film and subsequent electron-beam modification

“…Similarly, Wei et al [7] applied electron-beam surface modification of 5CrMoMn steel and concluded that the surface roughness, wear-resistance, and microhardness were significantly improved. The authors of [8] demonstrated that the corrosion resistance of 40CrNiMo7 steel was enhanced after surface modification by an electron beam. Currently, combinations of several methods for surface treatment, including electron-beam modification, thin films deposition, plasma nitriding etc.…”

Evolution of Structure in AlCoCrFeNi High-Entropy Alloy Irradiated by a Pulsed Electron Beam

“…A high-current pulsed electron beam has proven to be an effective tool for the microstructural modification of steels [28,29], Al-Mg [30], and Ni alloys [31]. However, only a few studies have been devoted to surface modification of HEAs by HCPEB.…”