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本文探讨了室温予变形对氰化过程的影响。研究发现,冷变形显著提高表面碳氮浓度并使奥氏体晶粒和碳氮化合物细化;但是予先冷变形对氰化层深度的影响较为复杂,这可能与变形方式以及冷变形产生的在不同方向的不同位错组态有关。用正电子湮灭谱仪测定了氰化过程中冷变形引起的晶体缺陷的变化。实验表明虽然高温下再结晶进展十分迅速,但由于碳氮原子的渗入和扩散可将位错固定并引起位错的增殖。在自行车另件生产上的实际应用表明,予先冷变形可使氰化另件的接触疲劳寿命提高50%到一倍。
This article explores the effect of pre-deformation at room temperature on the cyanidation process. It was found that cold deformation significantly increased the surface carbon and nitrogen concentration and refined austenite grains and carbonitrides; however, the pre-cold deformation had a more complicated effect on the depth of cyanide layer, which may be related to the deformation mode and the cold deformation Different dislocation configuration in different directions. Positron annihilation spectroscopy was used to measure the change of crystal defects caused by cold deformation during cyanidation. Experiments show that although the recrystallization progresses rapidly at high temperature, the dislocations can be fixed and cause the dislocation proliferation due to infiltration and diffusion of carbon and nitrogen atoms. The practical application of bicycle parts production shows that the pre-cold deformation can increase the contact fatigue life of the cyanide parts by 50% to 100%.