Abstract
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.
Highlights
The discussion of superplasticity has been performed in many scientific fields, materials science and engineering, and even in the field of earth science [1,2,3,4,5,6,7]
We have demonstrated the diffusions of carbon and boron into two kinds of fine grain type superplastic materials: one is superplastic duplex stainless steel (SPDSS) and another is titanium based duplex alloy
Diffusion can be activated by uniaxial compressive stress
Summary
The discussion of superplasticity has been performed in many scientific fields, materials science and engineering, and even in the field of earth science [1,2,3,4,5,6,7]. We have demonstrated the diffusions of carbon and boron into two kinds of fine grain type superplastic materials: one is superplastic duplex stainless steel (SPDSS) and another is titanium based duplex alloy. These alloys are common industrial superplastic materials. Materials 2011, 4 bonding (SPF-DB), further it has prospects for applying surface hardening treatments, such as carburization and boronization. The diffusion of carbon on the SPF-DB interface between high carbon steel and SPDSS is mentioned, and carburization and boronization processes using solid state diffusion of SPDSS are reviewed.
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