气体氮碳共渗白层疏松的控制  

Control of white layer porosity in gas nitrocarburizing

作　　者：王建新 吴锴 Wang Jianxin;Wu Kai(Wuhan Huamin Intelligent Manufacturing Technology Co.,Ltd.,Wuhan Hubei 430074,China)

机构地区：[1]武汉市华敏智造科技有限责任公司,湖北武汉430074

出　　处：《金属热处理》2023年第11期180-184,共5页Heat Treatment of Metals

摘　　要：氮碳共渗白层的疏松是影响其性能的重要因素之一,氮化物的分解以及氮原子重组为氮气分子为白层疏松形成的最重要机制。疏松的形成与材料种类、氮碳共渗工艺时间、工艺温度以及白层中氮碳浓度有关,白层中氮碳浓度又直接和气氛的氮势KN值和碳势KC值有关。一个典型氮碳共渗工艺中白层疏松的控制是对升温阶段、保温阶段和降温阶段整个工艺阶段的控制。Porosity in white layer is an important factor which affects its performance during gas nitrocarburizing,and the most important mechanism of porosity formation is the decomposition of nitrides and the recombination of atomic nitrogen to molecular nitrogen.The formation of porosity is related to the material,gas nitrocarburizing time and temperature,and the concentrations of nitrogen and carbon in the white layer which are directly related to the nitrogen potential K_N and carbon potential K_C values of the atmosphere.In a typical nitrocarburizing process,the control of white layer porosity is throughout the process,including all the heating,holding and cooling stages.

关 键 词：氮碳共渗 重组 KN KC 疏松 

分 类 号：TG156.8*2[金属学及工艺—热处理]