ON THE CONTROLLING FACTORS IN GROWTH OF BORONIZING LAYER AND ITS KINETIC ANALYSIS
JIANG Bailing Xi'an Jiaotong University;LEI Tingquan Harbin Institute of Technology
Cite this article:
JIANG Bailing Xi'an Jiaotong University;LEI Tingquan Harbin Institute of Technology. ON THE CONTROLLING FACTORS IN GROWTH OF BORONIZING LAYER AND ITS KINETIC ANALYSIS. Acta Metall Sin, 1991, 27(1): 11-15.
Abstract The nucleation of boride at boronizing initiation and the microstruc-tural difference in the boride crystals at different stages of growth have been observedunder TEM by using the single-side thinning technique. It seems that the controllingfactors proposed in growth of boronizing layer are the density of nuclei of botidecrystals on the surface of specimen. The process of boronizing may be described bytwo stages. First, the layer will thicken as the time prolonged according to a parabo-lic growth. Until the compressive stress in the front of layer is increased over a cer-tain critic value, the stacking faults will be induced in the boride crystals, so as toacceralate the diffusion of boron atoms and the growth of layer. This is called thesecond stage. In this stage, the deviation from parabolic growth and the approach toa straigh line relationship would be revealed.
