淬火冷却速率对60Si2CrVAT弹簧钢高周疲劳性能的影响
发布时间：2018-07-22 13:31
【摘要】：采用13%PAG(聚烷撑乙二醇)和油对60Si2Cr VAT弹簧钢进行淬火热处理,研究了不同淬火冷却速率对其轴向高周疲劳(r=-1)性能的影响。利用SEM、TEM和EBSD等方法对疲劳断口形貌、源区成分、显微组织进行表征。结果表明,13%PAG淬火后的疲劳极限(781.5 MPa)比油淬高67.5 MPa(714.0 MPa)。疲劳断口分析表明,疲劳破坏大部分起源于试样内部夹杂物和碳化物,形成"鱼眼"型撕裂的粒状亮区(GBF)。随裂纹源夹杂物处应力强度因子幅?Kinc的减小,疲劳寿命Nf增加,而GBF区边界的应力场强度因子幅?KGBF并不随Nf变化而改变,且13%PAG淬火试样的?KGBF大于油淬试样。实验钢13%PAG淬火试样组织中分布更多的纳米孪晶;马氏体板条块和板条更加细化,碳化物呈均匀细小弥散分布;而油淬碳化物较粗大,沿马氏体板条界和原奥氏体晶界分布。这些因素是PAG淬火后疲劳性能优于油淬的主要原因。
[Abstract]:The effects of different quenching cooling rates on the axial fatigue (r=-1) properties of 60Si2Cr VAT spring steel were studied with 13%PAG (polyalkylene glycol) and oil. The fatigue fracture morphology, source region composition and microstructure were characterized by SEM, TEM and EBSD. The results showed that the fatigue limit after 13%PAG was 781.. 5 MPa) higher than oil quenched by 67.5 MPa (714 MPa). Fatigue fracture analysis showed that most of the fatigue failure originated from internal inclusions and carbides in the specimen, forming a "fish eye" type bright zone (GBF). The decrease of the stress intensity factor of the inclusions at the crack source, the increase of fatigue life Nf, and the amplitude of the stress field intensity factor of the GBF zone boundary stress field intensity factor KGBF It does not change with the change of Nf, and the 13%PAG quenching specimen is larger than the oil quenching specimen. More nanoscale twins are distributed in the microstructure of the experimental steel 13%PAG quenched; the martensitic plate strips and the slate are more refined, the carbides are uniformly dispersed, and the oil quenching carbides are larger, along the martensitic lath boundary and the original austenite grain boundary. The main reason is that the fatigue property of PAG is better than that of oil quenching after quenching.
【作者单位】： 贵州大学材料与冶金学院;贵州省材料结构与强度重点实验室;高性能金属结构材料与制造技术国家地方联合工程实验室;贵州大学机械工程学院;
【基金】：国家自然科学基金(51461006) 贵阳市科技支撑计划项目筑科合同(2013101) 贵州省科技重大专项(20146012) 贵州省重大专项黔科合(JZ[2014]2003)~~
【分类号】：TG142.1;TG161
[Abstract]:The effects of different quenching cooling rates on the axial fatigue (r=-1) properties of 60Si2Cr VAT spring steel were studied with 13%PAG (polyalkylene glycol) and oil. The fatigue fracture morphology, source region composition and microstructure were characterized by SEM, TEM and EBSD. The results showed that the fatigue limit after 13%PAG was 781.. 5 MPa) higher than oil quenched by 67.5 MPa (714 MPa). Fatigue fracture analysis showed that most of the fatigue failure originated from internal inclusions and carbides in the specimen, forming a "fish eye" type bright zone (GBF). The decrease of the stress intensity factor of the inclusions at the crack source, the increase of fatigue life Nf, and the amplitude of the stress field intensity factor of the GBF zone boundary stress field intensity factor KGBF It does not change with the change of Nf, and the 13%PAG quenching specimen is larger than the oil quenching specimen. More nanoscale twins are distributed in the microstructure of the experimental steel 13%PAG quenched; the martensitic plate strips and the slate are more refined, the carbides are uniformly dispersed, and the oil quenching carbides are larger, along the martensitic lath boundary and the original austenite grain boundary. The main reason is that the fatigue property of PAG is better than that of oil quenching after quenching.
【作者单位】： 贵州大学材料与冶金学院;贵州省材料结构与强度重点实验室;高性能金属结构材料与制造技术国家地方联合工程实验室;贵州大学机械工程学院;
【基金】：国家自然科学基金(51461006) 贵阳市科技支撑计划项目筑科合同(2013101) 贵州省科技重大专项(20146012) 贵州省重大专项黔科合(JZ[2014]2003)~~
【分类号】：TG142.1;TG161
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