奥氏体氮碳共渗层中的Fe－N－C贝氏体

Fe-N-C Bainite in the Austenitic Nitrocarburized Layer

４５钢通氨滴醇奥氏体氮碳共渗油冷后．经２５０℃×４ｈ回火时效获得了硬化效果最好的Ｆｅ—Ｎ—Ｃ贝氏体．根据Ｆｅ—Ｎ—Ｃ三元相图，配合Ｘ射线相分析，估算了Ｆｅ—Ｎ—Ｃ贝氏体的氮、碳含量，用透射电镜观察了Ｆｅ—Ｎ—Ｃ贝氏体的组织形态及亚结构，并对其硬度、耐磨性和脆性进行了测试．

The best hardened Fe-N-C bainite was obtained as the gaseous austenitic nitrocarburized layer of steel 45 was oil quenchad and tempered at 250℃×4h. According to the result of X-ray diffraction analysis and FeN-C phase diagram,the nitrogen and carbon contents in the Fe-N-C bainite were reckoned.The morphology and second microstructure of the bainite were observed and the microhardness,wear resistence and brittleness were also determined.