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含硼钢化学热处理时,由于C、N、B之间的相互作用,B在整个渗层范围内发生明显的再分布在渗碳层中主要表现为表层B的富集和次表层B的贫化;在碳氮共渗层中则主要表现为表层和次表层内有大量BN形成以及在很宽的范围内固溶硼量很低 B的这种再分布对渗层材料的淬透性带来显著影响。在渗碳层中,除了要考虑C本身的作用和C对B效应的影响外,还要考虑次表层B贫化的影响。在碳氮共渗层中,大量BN的形成对渗透性有显著的不利影响,固溶硼贫化的作用也表现得更为突出。
During the chemical heat treatment of boron-containing steel, due to the interaction between C, N and B, obvious redistribution of B occurs in the carburized layer mainly in the enrichment of surface B and the depletion of subsurface B ; In the carbonitrided layer is mainly manifested as a large number of BN in the surface and subsurface formation and a very wide range of low-volume solid solution boron B re-distribution of the hardenability of the material layer To significant effect. In the carburizing layer, besides considering the effect of C itself and the influence of C on B effect, the influence of subsurface B depletion should also be considered. In the carbonitrided layer, the formation of a large amount of BN has a significant adverse effect on the permeability, and the role of solid solution boron depletion is also more pronounced.