渗碳处理高强齿轮钢BG801的高温疲劳行为  

High temperature fatigue behavior of carburized high-strength gear steel BG801

作　　者：陈为浩 许自宽 谷雪忠 杨卯生[3] 王斌[1,2] 张鹏[1,2] 张哲峰[1,2] Chen Weihao;Xu Zikuan;Gu Xuezhong;Yang Maosheng;Wang Bin;Zhang Peng;Zhang Zhefeng(Shenyang National Laboratory Center for Materials Science,Institute of Metal Research,Chinese Academy of Science,Shenyang Liaoning 110016,China;School of Materials Science and Engineering,University of Science and Technology of China,Shenyang Liaoning 110016,China;Research Institute of Special Steels,Central Iron and Steel Research Institute Co.,Ltd.,Beijing 100081,China)

机构地区：[1]中国科学院金属研究所沈阳材料科学国家研究中心,辽宁沈阳110016 [2]中国科学技术大学材料科学与工程学院,辽宁沈阳110016 [3]钢铁研究总院有限公司特殊钢研究院,北京100081

出　　处：《金属热处理》2025年第3期255-263,共9页Heat Treatment of Metals

基　　金：国家科技重大专项(J2019-VI-0019-0134)。

摘　　要：对BG801齿轮钢进行理论渗层深度1.1和1.3 mm的渗碳处理后,测试表征了两种不同渗碳层深度试样的显微组织、室温硬度、500℃高温硬度、残余应力和500℃高温旋转弯曲疲劳,并分析了影响疲劳性能的主要因素。结果表明,在渗碳层区,渗碳层理论深度1.3 mm试样的碳化物含量、硬度和残余压应力都要高于渗碳层理论深度1.1 mm试样;渗碳层理论深度1.1和1.3 mm试样的500℃高温旋转弯曲疲劳强度分别为675和850 MPa。在渗碳层区,渗碳层理论深度1.3 mm试样具有相对较高的硬度,这能在一定程度上抑制微裂纹萌生;另外,由于综合残余应力与碳化物尺寸的影响,在相同外加循环应力作用下,渗碳层理论深度1.3 mm试样所承受的疲劳裂纹扩展驱动能量要小于渗碳层理论深度1.1 mm试样,这是渗碳层理论深度1.3 mm试样疲劳性能较优的另一原因。After carburizing treatment with theoretical case depths of 1.1 and 1.3 mm on BG801 gear steel,the microstructure,room temperature hardness,500℃high temperature hardness,residual stress,and 500℃high temperature rotating bending fatigue of this two specimens were tested and characterized,and the main factors affecting fatigue property were analyzed.The results show that in the carburized zone,the carbide content,hardness,and residual compressive stress of the specimens with a theoretical case depth of 1.3 mm are higher than those of the specimens with a theoretical case depth of 1.1 mm.The rotating bending fatigue strength of the specimens with theoretical case depths of 1.1 and 1.3 mm at 500℃is 675 and 850 MPa,respectively.In the carburized zone,the specimen with a theoretical case depth of 1.3 mm has relatively high hardness,which can suppress the initiation of microcracks to a certain extent.In addition,combined with the effect of residual stress and carbide size,the fatigue crack propagation driving energy of the specimen with a theoretical case depth of 1.3 mm is smaller than that of the specimen with a theoretical case depth of 1.1 mm under the same external applied cyclic stress,which is another reason why the fatigue property of the specimen with a theoretical case depth of 1.3 mm is better.

关 键 词：BG801齿轮钢 渗碳处理 硬度 残余应力 高温旋转弯曲疲劳 

分 类 号：TG142.1[一般工业技术—材料科学与工程]