BEHAVIOUR OF BORON IN CARBONIZED AND CARBONITRIDED CASE AND CASE-HARDENABILITY OF BORON STEEL |
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Authors: | CHU Youyi HE Xinlai FENG Ruilin CHEN Zhiguo WU Jinyao |
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Affiliation: | CHU Youyi,HE Xinlai (Beijing University of Iron and Steel Technology),FENG Ruilin,CHEN Zhiguo,WU Jinyao (Nanchang Gear Plant) |
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Abstract: | The B is obviously redistributed in B steel within the whole carbonized and carbonitrided case because of the interaction between B with N and C during carbonizing and carbonitriding. The most of all behaviour of B observed in the carbonized case is the enrichment into the surface layer and the depletion from the sub-layer beneath surface, and in the earbonitrided case is the formation of abundant BN in the wide region from surface and the extension of depleted solution B into deep zone. The redistribution of B is remarkably influenced on the hardenability of the case. The carbonized case hardenability is affected not only by the carbon changed in content and influenced on B hardenability effect, but also by the B depletion in sub-layer. The abundant BN particles with solution B depletion deeply into the interior formed in carbonitrided ease is very harmful to the hardenability. |
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