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Tanaka K.,Toyota Central Research Labs. Ltd. | Takamiya H.,Toyota Central Research Labs. Ltd. | Iwata N.,Toyota Central Research Labs. Ltd. | Nakanishi K.,Toyota Central Research Labs. Ltd.
ISIJ International | Year: 2011

In our previous paper, the eutectic liquid that appears between the cementite (θ ) foil and austenite was proposed to be most suitable for rapid transient-liquid-phase (TLP) bonding of steels. A partial substitution with Cr was required for metastable θ to be thermodynamically stable up to the solidus temperature. On the other hand, the liquid region disappeared quickly by C diffusion, leaving severe Cr segregation along the bonded interface. The present study aims to decrease the ratio of Cr substitution in θ so as to eliminate the homogenization step and allow the use of steel parts as-bonded. Compared to θ with a higher Cr substitution, the synthesized θ with 1 mass% Cr (1Cr-θ ) showed an enhanced tendency to decompose on cooling from 1 373 K. However, the 1Cr-θ foil was confirmed to give the eutectic liquid that dissolved V during TLP bonding of V-microalloyed steels. After holding for 180 s at 1 453 K, a gradient ferrite-pearlite microstructure was obtained in the bond without any boundaries or hard layers due to Cr segregation. The bonded steel showed a tensile strength and elongation corresponding to those of the original V-steel. © 2011 ISIJ.

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