颗粒度对纯铁气体氮化生成物的影响  

Study on influence of particle-size on nitriding of pure iron

作　　者：刘一梅[1] 黑祖昆[1] 杨述亮[1] 

机构地区：[1]大连海事大学轮机工程学院,辽宁大连116026

出　　处：《大连海事大学学报》2004年第4期63-65,共3页Journal of Dalian Maritime University

摘　　要：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.This article studing the influence of particle-size on nitriding of pure iron with pure iron of different partiale-size, and the results show that the phases constitute and amount of nitrides can be influenced by particle-size of iron powder in gaseous nitriding and the nitriding of fined iron powder is easy because of the surface energy, The amount of grain boundry and of mis-location increase after fining, when diameter of iron powder was fined to one tenth of original one, the critical temperature of nitriding was lowered more than 50 ℃ and nitriding speed increased remarkably.

关 键 词：纯铁 气体渗氮 颗粒度 氮化物 

分 类 号：TG156.82[金属学及工艺—热处理]