低温液体氧氮化对奥氏体不锈钢磨损行为的影响  

Effect of low-temperature liquid oxy-nitriding on wear behavior of austenitic stainless steel

作　　者：李龙义 杨涛 樊勋 陈波[1] 王均[3] 王天石[1] LI Longyi;YANG Tao;FAN Xun;CHEN Bo;WANG Jun;WANG Tianshi(The 29th Research Institute of CETC,Chengdu 610036,China;Chengdu SIWI High-Tech Industry Co.,Ltd.,Chengdu 611730,China;School of Mechanical Engineering,Sichuan University,Chengdu 610064,China)

机构地区：[1]中国电子科技集团公司第二十九研究所,四川成都610036 [2]成都四威高科技产业园有限公司,四川成都611730 [3]四川大学机械工程学院,四川成都610064

出　　处：《电镀与涂饰》2024年第3期64-74,共11页Electroplating & Finishing

摘　　要：[目的]奥氏体不锈钢被广泛用于制造各种航空电子装备零部件,但其硬度和耐磨性欠佳。[方法]采用低温液体氧氮化技术对304奥氏体不锈钢进行表面改性处理。采用扫描电子显微镜、透射电子显微镜、维氏硬度计等分析了所得复合改性层的微观组织和截面显微硬度分布,通过摩擦磨损试验探究了表面改性层的耐磨性。[结果]低温液体氧氮化表面改性层由外侧致密的Fe_(3)O_(4)相和内侧富氮S相构成。S相是含氮过饱和固溶体,含有大量位错、层错和孪晶,因此硬度较高。载荷和温度会影响不锈钢样品的磨损行为,温度升高和载荷增大都会使304奥氏体不锈钢样品和低温液体氧氮化样品的平均摩擦因数轻微下降,磨损体积损失增大。不过低温液体氧氮化处理能够缩短304奥氏体不锈钢样品初始磨损阶段的持续时间,使其在载荷10 N、温度200℃条件下的最大磨损体积损失由1.086 mm^(3)降至0.144 mm^(3)。[结论]低温液体氧氮化处理能够显著提高304奥氏体不锈钢的耐磨性。[Introduction]Austenitic stainless steels are widely used in the manufacturing of various avionic components,but their hardness and wear resistance are not good.[Method]The surface modification of 304 austenitic stainless steel was carried out by low-temperature liquid oxy-nitriding(LTON).The microstructure and microhardness distribution along the cross-section of the LTON layer were characterized by using scanning electron microscope,transmission electron microscope,and Vickers hardness tester.The wear resistance of the modified layer was studied by friction and wear test.[Result]The low-temperature liquid oxy-nitriding layer was composed of the outer compact Fe_(3)O_(4) phase and the inner nitrogen-rich S-phase.The S-phase is a kind of supersaturated solid solution containing nitrogen and plenty of dislocations,stacking faults,and twin crystals,so it has high hardness.The temperature and load during the friction and wear test affected the wear behavior of 304 austenitic stainless steel.Both the increase in temperature and load led to a slight decrease in the average friction coefficient of 304 austenitic stainless steel and an increase in its wear volume loss,no matter whether it was treated by LTON or not.After being treated by LTON,the duration of the initial wear stage of 304 austenitic stainless steel was shortened,and its maximum wear volume loss was decreased from 1.086 mm^(3) to 0.144 mm^(3) under a load of 10 N at 200℃.[Conclusion]The wear resistance of 304 austenitic stainless steel can be significantly improved by LTON.

关 键 词：奥氏体不锈钢 低温液体氧氮化 微观组织 磨损行为 

分 类 号：TG156.82[金属学及工艺—热处理]