摘要
利用洛氏硬度计、维氏硬度计及光学显微镜等研究了真空低压渗碳工艺对航空轴承钢组织和性能的影响。结果表明:试验钢经渗碳后产生了大量连续的粗大网状碳化物,但在渗碳后热处理工艺中碳化物形貌逐渐变为非连续的网状;有效硬化层由渗碳后的0. 45 mm逐步增加到设定值附近(0. 77 mm);渗层硬度梯度中的"低头"现象也逐步消除,从渗层到心部硬度平缓降低;相较于原始硬度,试验钢的表面硬度经渗碳后增加了11 HRC,经过全工序真空低压渗碳后提高了16~18 HRC。
Effect of low-pressure carburizing on the microstructure and properties of aviation bearing steel was studied by using Rockwell hardness tester,Vickers hardness tester and optical microscopy. The results show that a continuous network of grain boundary carbides is observed after carburizing,but it gradually changes to be discontinuous during the subsequent heat treatment process. The effective hardening layer gradually increases from 0. 45 mm after carburizing to the neighboring region of the preset value( 0. 77 mm). The"bow"phenomenon in hardness curve of carburizing layer gradually eliminates,and the hardness curve becomes smoother from the carburized surface to the core.After carburizing,the hardness of the experimental steel is increased by 11 HRC compared with the original hardness. After the whole heat treatment process of vacuum and low pressure carburizing process,the surface hardness is further increased by 16-18 HRC.
作者
王会
王昊杰
贾涛
田勇
王昭东
Wang Hui;Wang Haojie;Jia Tao;Tian Yong;Wang Zhaodong(State Key Laboratory of Rolling and Automation,Northeastern University,Shenyang Liaoning 110819,China)
出处
《金属热处理》
CAS
CSCD
北大核心
2020年第1期1-5,共5页
Heat Treatment of Metals
基金
国家重点研发计划(2017YFB0304201)
关键词
热处理
真空低压渗碳
航空轴承钢
表面硬度
网状碳化物
残留奥氏体
heat treatment
vacuum low pressure carburization
aviation bearing steel
surface hardness
reticular carbide
retained austenite
