摘要
为了研究拉矫破鳞过程中,压应力对氧化膜剥落的作用,建立了氧化膜的薄板模型,推导出氧化膜长度与临界荷载之间的关系,利用差分法理论计算出失稳条件下的临界荷载公式。模型中的材料参数氧化膜弹性模量由纳米压痕实验测得为145GPa,基体与氧化膜的结合力系数由拉伸实验测得为18.2MPa/m;利用拉矫破鳞机对带钢施加100、150、200MPa的压应力作用,通过金相实验观察统计出断裂后的残余长度,并与理论计算的残余长度进行对比,验证得到拉矫破鳞实验得出的断裂长度与差分法理论计算出的残余长度的结果相差小于12%。研究表明氧化膜受压断裂,理论推导出的临界残余氧化膜长度与实际受压断裂氧化膜长度相近;临界荷载公式表明压应力与残余氧化膜最大长度呈平方反比关系。
To research the compressive stress effect of oxidation peeling on the process of oxide fracture by tension levelling methods, oxide film model of thin plate was established and calculating formula of the critical load under the unstable condition was developed by difference method. The parameters of this model were measured through two experiments. Elastic modulus of oxide thin films was measured by nano-indentation. The binding force relationship between iron matrix and oxide film was measured by tensile test. Using the tension leveling and loading strip steel with 100, 150 and 200 MPa compressive stress, the length of the experiment through metallographic test with the length of computing results are compared. The elastic modulus of oxide films was measured as 145 GPa through nanoindention, and the relative errors between the experimental length and calculated length is small. The results show that the critical residual length calculated is nearly the same as the critical length measured in practice. The critical load model shows that with increase of compressive stress, the residual length of the oxide film decreases.
出处
《钢铁研究学报》
CAS
CSCD
北大核心
2017年第9期762-767,共6页
Journal of Iron and Steel Research
