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Materials 2011, 4(7), 1309-1320; doi:10.3390/ma4071309

Boronization and Carburization of Superplastic Stainless Steel and Titanium-Based Alloys

Department of Mechanical Engineering, Ehime University, 3-Bunkyocho, Matsuyama 790-8577, Japan
Received: 28 June 2011 / Accepted: 12 July 2011 / Published: 18 July 2011
(This article belongs to the Special Issue Superplasticity and Superplastic Forming)
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Bronization and carburization of fine-grain superplastic stainless steel is reviewed, and new experimental results for fine grain Ti88.5Al4.5V3Fe2Mo2 are reported. In superplastic duplex stainless steel, the diffusion of carbon and boron is faster than in non-superplastic duplex stainless steel. Further, diffusion is activated by uniaxial compressive stress. Moreover, non-superplastic duplex stainless steel shows typical grain boundary diffusion; however, inner grain diffusion is confirmed in superplastic stainless steel. The presence of Fe and Cr carbides or borides is confirmed by X-ray diffraction, which indicates that the diffused carbon and boron react with the Fe and Cr in superplastic stainless steel. The Vickers hardness of the carburized and boronized layers is similar to that achieved with other surface treatments such as electro-deposition. Diffusion of boron into the superplastic Ti88.5Al4.5V3Fe2Mo2 alloy was investigated. The hardness of the surface exposed to boron powder can be increased by annealing above the superplastic temperature. However, the Vickers hardness is lower than that of Ti boride.
Keywords: diffusion; superplasticity; carburization; boronization; duplex stainless steel diffusion; superplasticity; carburization; boronization; duplex stainless steel
This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Matsushita, M. Boronization and Carburization of Superplastic Stainless Steel and Titanium-Based Alloys. Materials 2011, 4, 1309-1320.

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