钢的渗硼零件没有再处理(淬火和回火)不能用于高接触压力条件下工作。薄硬的硼化层(0.1～0.4毫米)下存在软组织,在小的局部负载作用下会压弯和碎裂。渗硼零件经过淬火使底层具有高硬度,同时在硼化层中出现促成产生裂缝的拉应力。对硼化层脆性高原因的研究表明,硼化层中裂缝产生的过程是由于FeB和Fe:B相线膨胀系数不同而产生相间应力所引起的。通过许多工作得出一个结论:硬度高且脆的FeB相对零件的使用性能有坏的影响。近年来西德和日本主要是发展固相渗硼代替电解渗硼法,用电解渗硼法时,硼化层中含FeB达到60%以 Steel boronizing parts without reprocessing (quenching and tempering) can not be used under conditions of high contact pressure. Soft tissue is present in the thin, hard, boronized layer (0.1-0.4 mm), bending and chipping under small local loads. The boronized parts are quenched so that the underlayer has a high hardness and at the same time a tensile stress is generated in the boride layer that causes cracks to develop. The research on the reason of the brittleness of the boride layer shows that the process of the crack in the boride layer is caused by the interphase stress due to the different linear expansion coefficients of FeB and Fe: B phase. There is a lot of work to come to the conclusion that a hard and brittle FeB has a bad effect on the serviceability of the part. In recent years, West Germany and Japan are mainly the development of solid-borosilicate instead of electrolytic boronization, electrolytic boron-infiltration method, the boride layer containing FeB up to 60%