不同氧含量非调质钢的高周疲劳性能  

High-cycle fatigue properties of microalloyed medium carbon steels with different oxygen content

作　　者：王琼[1,2] 惠卫军[1,2] 陈思联[2] 查小琴[3] 董瀚[2] 翁宇庆[2] 

机构地区：[1]昆明理工大学材料与冶金工程学院,云南昆明650093 [2]钢铁研究总院先进钢铁材料技术国家工程研究中心,北京100081 [3]中国船舶重工集团公司第725研究所,河南洛阳471039

出　　处：《材料热处理学报》2010年第1期110-114,共5页Transactions of Materials and Heat Treatment

基　　金：国家"十一五"科技支撑计划项目(2007BAE51B03)

摘　　要：采用旋转弯曲疲劳试验对比研究了两种不同氧含量(0.0018%和低于0.001%)中碳微合金非调质钢F45MnV在不同状态(正火、调质和锻造)下的高周疲劳性能。结果表明,在具有均一回火索氏体组织的调质态,低氧料F45MnV-1的疲劳性能优于高氧料F45MnV-2;在具有类似铁素体+珠光体组织的正火态,两种料的高周疲劳性能和疲劳裂纹扩展速率基本一致;锻态F45MnV-1料由于具有细小、均匀的铁素体+珠光体组织,其高周疲劳性能优于正火态F45MnV-1料,而与调质态F45MnV-1接近。对于铁素体+珠光体组织和均匀调质组织,非金属夹杂物对疲劳破坏行为的不同影响是上述试验钢疲劳性能差异的主要原因。此外,两种试验钢的铁素体+珠光体组织的裂纹扩展速率均略低于调质态组织。High-cycle fatigue properties of the microalloyed medium-carbon steel F45MnV with different oxygen content under different processing conditions（asnormalized,quenched and tempered（QT） and forged） were studied by rotating bending fatigue tests.The results show that the fatigue property of the QT steel F45MnV-1 with lower oxygen content is superior to that of the QT steel F45MnV-2 with higher oxygen content,whereas for the normalized specimens with ferrite plus pearlite microstructure,no significant difference in fatigue strength and fatigue crack growth behavior is observed for the two steels.The as-forged F45MnV-1 steel exhibits much higher fatigue property than that of the as-normalized one for the uniform and finer ferrite and pearlite microstructure of the former,and the similar fatigue property for the as-forged steel is observed compared with that under the as-QT condition.It is suggested that the different effects of nonmetallic inclusion on fatigue behaviors of the tested steels with different microstructure are the main reason for the above results.Moreover,the fatigue crack growth resistance of ferrite plus pearlite microstructure is slightly superior to that of tempered martensite for the both steels with different oxygen content.

关 键 词：氧含量 非调质钢 疲劳性能 疲劳裂纹扩展速率 

分 类 号：TG142.4[一般工业技术—材料科学与工程] TG162.83[金属学及工艺—金属材料]