Abstract

Superplastic boronizing is a new processing technology that combines boronizing with superplastic deformation. This process not only has a much faster boronizing rate compared with the conventional boronizing method, but also produces boronized layers with improved mechanical properties. The present project studies the mechanical properties of a low-alloy steel (0.9C1Si1CrFe) after superplastic boronizing treatment. The results indicate that superplastic boronizing has improved the fracture strength of the specimens by 8%, the toughness by 18% and the maximum flexure by 15%, compared with the conventional boronizing process. Microstructural and microcompositional changes were observed which are believed to effect the mechanical-property improvement. Superplastic boronizing has wide potential applications in the surface modification on steels, and it can be used to study the mechanism of superplastic deformation.

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