航空齿轮钢C69高温渗碳后的组织性能  

Microstructure and properties of C69 gear steel for aviation after high temperature carburizing

作　　者：戴建科 韩顺[1] 厉勇[1] 刘宪民[1] 王春旭[1] 庞学东 李建新 Dai Jianke;Han Shun;Li Yong;Liu Xianmin;Wang Chunxu;Pang Xuedong;Li Jianxin(Research Institute of Special Steels,Central Iron and Steel Research Institute Co.,Ltd.,Beijing 100081,China;Technology Center,Fushun Special Steel Co.,Ltd.,Fushun Liaoning 113001,China)

机构地区：[1]钢铁研究总院有限公司特殊钢研究院,北京100081 [2]抚顺特殊钢股份有限公司技术中心,辽宁抚顺113001

出　　处：《金属热处理》2022年第4期219-225,共7页Heat Treatment of Metals

摘　　要：通过OM、SEM、TEM以及显微硬度计等设备研究了1050℃下不同渗碳工艺对航空齿轮钢C69组织及性能的影响。结果表明,经渗碳、深冷和回火处理后,渗碳层表层的显微硬度最高可达约950 HV0.3,组织为针状马氏体,马氏体上观察到M3C、M2C碳化物,晶界处有M7C3碳化物分布,次表层组织为针状马氏体和板条马氏体,心部显微硬度约为630 HV0.3,组织主要为板条马氏体。循环渗碳的渗碳效率更高,随循环次数增加,试验钢的表面碳含量和渗碳层深度不断提高,且晶界处M7C3尺寸和数量逐渐增加。4次循环渗碳的表面碳含量为1.14%,渗碳层深度约为3.0 mm。Effect of different carburizing processes at 1050℃on microstructure and properties of gear steel C69 for aviation was studied by using OM,SEM,TEM and Vickers hardness tester.The results show that after carburizing,cryogenic and tempering,the surface hardness of the carburized layer can reach about 950 HV0.3,and the microstructure is acicular martensite where the M3C and M2C carbides precipitate,and the M7C3carbides precipitate at grain boundary.At the sub-layer of the carburized surface,microstructure is composed of acicular martensite and lath martensite.At the core,the microstructure is lath martensite and the hardness is about 630 HV0.3.The cyclic carburizing has higher carburizing efficiency.With the increase of carburizing cycle,the thickness of carburized layer and surface carbon concentration increase continuously,and the size and quantity of the M7C3 at the grain boundary also increase.After four cycles carburizing,the surface carbon concentration is 1.14%,and the thickness of carburized layer is about 3.0 mm.

关 键 词：航空齿轮钢 C69钢 渗碳工艺 渗层硬度 碳化物 

分 类 号：TG142.1[一般工业技术—材料科学与工程]