回火温度对60Si2MnA弹簧钢高周疲劳性能的影响  

Effect of tempering temperature on high-cycle fatigue properties of 60Si2MnA spring steel

作　　者：许倩[1,2] 惠卫军[1,2] 龙晋明[1] 梁玫[3] 陈红卫[3] 

机构地区：[1]昆明理工大学材料科学与工程学院,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]石家庄钢铁有限责任公司开发部,河北石家庄050031

出　　处：《金属热处理》2012年第8期8-12,共5页Heat Treatment of Metals

摘　　要：利用旋转弯曲疲劳试验方法,研究了60Si2MnA弹簧钢在400℃和440℃回火后的高周疲劳破坏行为。结果表明,回火温度主要影响60Si2MnA弹簧钢的微观组织及强度从而影响其高周疲劳性能。当回火温度较高而强度水平较低时,疲劳破坏主要起源于试样表面,存在传统的疲劳极限;当回火温度较低而强度水平较高时,疲劳破坏主要起源于内部粗大的夹杂物,S-N曲线连续降低,传统的疲劳极限消失。尽管400℃回火试样的疲劳极限较高,但其疲劳强度比明显低于440℃回火试样。进一步细化钢中的夹杂物,则有望改善较低温度回火样的疲劳性能。High cycle fatigue fracture behaviors of 60Si2MnA spring steel tempered at 400℃ and 440℃ were studied by using rotating bending fatigue test. The experimental results show that the tempering temperature has significant influence on its fatigue properties. That is, when tempered at higher temperature 440℃ and thus obtained a lower strength level, most of the fatigue cracks initiate from specimen surface and conventional S-N curve exists; while when tempered at lower temperature 400℃ and thus obtained a higher strength level, the S-N curve displays a continuous decline and fatigue failures originated mainly from large oxide inclusion and therefore conventional S-N curve does not exist. Though the fatigue strength of the specimen tempered at 400 ℃ is high than that tempered at 440℃, the fatigue strength ratio of the latter is much higher than that of the former. It is suggested that the fatigue property of lower tempering specimen could be further improved by refining inclusion size.

关 键 词：回火温度 60Si2MnA弹簧钢 高周疲劳 非金属夹杂物 

分 类 号：TG142.41[一般工业技术—材料科学与工程] TG111.91[金属学及工艺—金属材料]