Plasma Nitriding of 20CrMo Steel with Nanostructured Surface Layer

Jian Sun; Jing Zhang; Wei Ping Tong; Liang Zuo; Ji Cheng He

doi:10.4028/www.scientific.net/AMR.472-475.30

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Plasma Nitriding of 20CrMo Steel with Nanostructured Surface Layer
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Plasma Nitriding of 20CrMo Steel with Nanostructured Surface Layer

Abstract:

A nanostructured surface layer was produced on an 20CrMo steel plate by means of ultrasonic shot peening (USSP) treatment. Plasma nitriding of the treated and un-treated sample were investigated by using structure analysis (X-ray diffraction, optical microscopy, and transmission electron microscopy ) as well as hardness measurements. It was found that a nanostructured surface layer sample developed a compound layer twice as thick as that in a coarse-grained sample under the same plasma nitriding conditions (530 oC for 6 h). In addition, the USSP nitrided sample exhibited higher hardness and thicker hardened surface layer in comparison with coarse-grained nitrided sample.