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分别以不同颗粒度的纯铁铁粉为研究对象,进行气体渗氮.通过各种渗氮条件下的氮化实验,系统地研究了颗粒度对纯铁氮化行为的影响,研究结果表明:在气体氮化实验中,纯铁铁粉氮化后所形成的氮化物的相组成及含量与颗粒度有关,细化后的铁粉由于表面能及晶界、位错等缺陷的增加,为氮原子的渗入提供了有利条件,当粒径减小为原来的1 10后,临界渗氮温度可以至少下降50℃,并且相同温度下的渗氮速度明显提高.
The pure iron iron powder with different granularity was taken as the research object to carry out gas nitriding.The influences of particle size on the nitriding behavior of pure iron were studied systematically through the nitriding experiments under various nitriding conditions.The results show that: In gas nitriding experiments, the phase composition and content of nitrides formed after the nitriding of pure iron iron powder is related to the particle size. The refined iron powder, due to the increase of surface energy and the defects of grain boundaries and dislocations, is The infiltration of nitrogen atoms provides favorable conditions. When the particle size is reduced to the original value of 10, the critical nitriding temperature can be decreased by at least 50 ° C, and the nitriding rate at the same temperature is significantly increased.