Surface nanostructure and improved microhardness of 40CrNiMo7 steel induced by high current pulsed electron beam treatment
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms（2017）
摘要
•Surface modification of 40CrNiMo7 steel was performed by HCPEB treatment.•Surface remelted layer of depth ∼7µm was obtained.•Composite nanostructure of refined austenite and martensite phases was formed.•After 25 HCPEB pulses, average size of small cells on modified surface decreased to ∼120nm.•Surface microhardness was tripled to more than 1000HK.
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关键词
High current pulsed electron beam,40CrNiMo7 steel,Surface nanocrystallization,Microstructure,Microhardness
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