夹杂物尺寸对汽车车轮用钢疲劳寿命的影响  

Influence of Inclusion Size on Fatigue Life of High Strength Steel for Automobile Wheel

作　　者：赵凤晓[1] 李会 许晓嫦[1] 李良[1] 徐浩浩[1] 

机构地区：[1]中南大学材料科学与工程学院,湖南长沙410083 [2]涟源钢铁公司技术中心,湖南娄底417000

出　　处：《矿冶工程》2013年第1期101-105,共5页Mining and Metallurgical Engineering

摘　　要：采用MTS858电液伺服疲劳实验机研究了高强度车轮用钢的疲劳寿命,并用Quanta 600环境扫描电子显微镜对疲劳断口形貌进行了观察。通过对实验数据分析,计算得出了夹杂物的临界尺寸,并根据正态分布理论对车轮钢的疲劳寿命进行了预测。研究结果表明,疲劳裂纹均是从内部或者亚表面的夹杂物处萌生;能谱分析表明:夹杂物的成分主要是钙铝的氧化物,测量所得裂纹源处夹杂物尺寸大部分超过了临界尺寸。The fatigue life of high strength steel for automobile wheel was investigated by MTS858 electro-hydraulic servo fatigue testing, and then the fatigue fracture morphology was analyzed by Quanta 600 scanning electron microscope （SEM）. Based on the preliminary analysis of the experimental data, the critical size of inclusions was calculated. According to the theory of normal distribution, fatigue life of the wheel steel was predicted. The results show that the fatigue cracks are all initiated from the internal and subsurface inclusions. The energy spectrum analysis indicates that the main components of the inclusions are oxides of calcium and aluminium. The measured size of most of the inclusions at the crack sources are larger than the critical size.

关 键 词：车轮用钢 疲劳寿命 夹杂物 临界夹杂物尺寸 

分 类 号：TG115[金属学及工艺—物理冶金]