Fatigue crack initiation and propagation behavior of high temperature carburized bearing steel during rotary bending
LIU Tian-xiang1,2, YANG Mao-sheng2, LI Shao-hong1
1. College of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, Yunnan, China; 2. Institute of Special Steels, Central Iron and Steel Research Institute, Beijing 100081, China
Abstract：In order to improve the service life of aviation bearing, with the help of QBWP-10000X rotary bending fatigue testing machine,the rotary bending fatigue properties and crack initiation and propagation behavior of high temperature carburized bearing steel were studied. The results show that the median fatigue strength of the steel reaches 913.3 MPa. A large amount of M23C6 and a small amount of M6C carbides in the effective carburized layer significantly improve the surface hardness of the test steel. Different carbon concentrations in the carburized layer lead to martensite transformation successively and form 408 MPa surface compressive stress,which further improves the fatigue property of the steel. The fatigue cracks mainly originate from surface defects and subsurface carbides,accounting for 71.4% and 28.6% respectively. The results show that the characteristic size of crack initiation and the bearing stress have a significant effect on the stress intensity factor and the number of cycles. The shape of deep furrow directly affects the number of cycles due to the stress concentration. The larger the characteristic size of carbide under the same loading stress,the lower the number of cycles. After the crack initiation,it propagates rapidly along the carbide boundary of carburized layer and slowly to the core. Finally,quasi cleavage and ductile mixed fracture occur near the edge of the specimen on the opposite side of the fatigue source.
刘天祥, 杨卯生, 李绍宏. 高温渗碳轴承钢旋弯疲劳裂纹萌生与扩展行为[J]. 钢铁, 2021, 56(9): 136-143.
LIU Tian-xiang, YANG Mao-sheng, LI Shao-hong. Fatigue crack initiation and propagation behavior of high temperature carburized bearing steel during rotary bending[J]. Iron and Steel, 2021, 56(9): 136-143.
[1] 耿思远,杨卯生,赵昆渝,等. 温度对高钴钼不锈轴承钢高周疲劳性能的影响[J]. 钢铁,2018,53(12):77.(GENG Si-yuan,YANG Mao-sheng,ZHAO Kun-yu,et al. Influence of temperature on high cycle fatigue properties of high cobalt molybdenum stainless bearing steel[J]. Iron and Steel,2018,53(12):77.) [2] 郭军,杨卯生,卢德宏,等. Cr4Mo4V轴承钢旋转弯曲疲劳寿命及疲劳裂纹萌生机理[J]. 材料工程,2019,47(7):134. (GUO Jun,YANG Mao-sheng,LU De-hong,et al. Rotational bending fatigue life and fatigue crack initiation mechanism of Cr4Mo4V bearing steel[J]. Journal of Materials Engineering,2019,47(7):134.) [3] ZHOU C,WANG M,HUI W,et al. Rotating bending fatigue properties of two case hardening steels after nitriding treatment[J]. Materials and Design, 2013,46:539. [4] LIU Y,WANG M,SHI J,et al. Fatigue properties of two case hardening steels after carburization[J]. International Journal of Fatigue,2009,31(2):292. [5] Sirin S Y,Sirin K,Kaluc E. Effect of the ion nitriding surface hardening process on fatigue behavior of AISI 4340 steel[J]. Materials Characterization,2008,59(4):351. [6] 张国强. 重载渗碳齿轮钢的疲劳性能研究[D]. 昆明:昆明理工大学,2009.(ZHANG Guo-qiang. Study on Fatigue Properties of Heavy Duty Carburized Gear Steel[D]. Kunming:Kuming University of Science and Technology,2009.) [7] Asi O,Can A,Pineault J,et al. The effect of high temperature gas carburizing on bending fatigue strength of SAE 8620 steel[J]. Materials in Engineering,2009,30(5):1792. [8] 张良,雍岐龙,梁剑雄,等. 1Cr17 Ni1双相不锈钢室温旋转弯曲疲劳性能[J]. 钢铁研究学报,2016,28(6):74.(ZHANG Liang,YONG Qi-long,LIANG Jian-xiong,et al. Properties of rotating-bengding fatigue of 1Cr17 Ni1 duplex stainless steel at room temperature[J]. Journal of Iron and Steel Research,2016,28(6):74.) [9] LI W,SUN Z,ZHANG Z,et al. Influence of case-carburizing and micro-defect on competing failure behaviors of Ni-Cr-W steel under gigacycle fatigue[J]. International Journal of Fatigue,2015,72(3):66. [10] Zajusz M,Tkacz-S＇miech K,Danielewski M. Modeling of vacuum pulse carburizing of steel[J]. Surface and Coatings Technology,2014,258:646. [11] Ebert L J. The role of residual stresses in the mechanical performance of case carburized steels[J]. Metallurgical Transactions A,1978,9(11):1537. [12] 黄帅,张国强,王毛球,等. 不同渗碳层深度下重载齿轮钢的疲劳性能[J]. 钢铁研究学报,2012,24(4):34.(HUANG Shuai,ZHANG Guo-qiang,WANG Mao-qiu,et al. Fatigue properties of heavy-duty gear steel with different carburized depth[J]. Journal of Iron and Steel Research,2012,24(4):34.) [13] XIAO N,HUI W,ZHANG Y,et al. High-cycle fatigue behavior of vacuum-carburized 20Cr2 Ni4 steel with different case depths[J]. Journal of Materials Engineering and Performance,2019,28(6):3413. [14] 袁晓虹. 高Cr-Co-Mo轴承钢强韧机制及抗疲劳特性的多尺度研究[D]. 昆明:昆明理工大学,2015.(YUAN Xiao-hong. Multi-Scale Strengthening-Toughening Mechanisms and Fatigue Resistance of High-Alloy Cr-Co-Mo Bearing Steel[D]. Kunming:Kuming University of Science and Technology,2015.) [15] 王博,杨卯生,赵昆渝,等. 双真空冶炼高合金轴承钢真空表面渗碳疲劳性能的研究[J]. 真空科学与技术学报,2016,36(7):838.(WANG Bo,YANG Mao-sheng, ZHAO Kun-yu,et al. Fatigue resistance of surface-carburized Cr-Co-Mo-Ni bearing steel refined by vacuum melting[J]. Chinese Journal of Vacuum Science and Technology,2016,36(7):838.) [16] Murakami Y. Metal Fatigue:Effects of Small Defects and Nonmetallic Inclusions[M]. Oxford:Elsevier Science Ltd.,2002. [17] Murakami Y,Kodama S. Quantitative evaluation of effects of non-metallic inclusions on fatigue strength of high strength steels,I:Basic fatigue mechanism and evaluation of correlation between the fatigue fracture stress and the size and location of nonmetallic inclusions[J]. International Journal of Fatigue,1989,11(5):291. [18] Murakami Y,Endo M. Quantitative evaluation of fatigue strength of metals containing various small defects of cracks[J]. Engineering Fracture Mechanics,1983,17:1. [19] Nakagawa A,Sakai T,Harlow D G,et al. A probabilistic model on crack initiation modes of metallic materials in very high cycle fatigue[J]. Procedia Structural Integrity,2016(2):1199.
2021, Vol. 56 
