风电螺栓R角微裂纹成因的仿真分析  

Simulation analysis of causes of micro-cracks at R-corner of wind power bolt

作　　者：陈旭鹏 许晓嫦[1] 梁嘉俊 CHEN Xupeng;XU Xiaochang;LIANG Jiajun(School of Materials Science and Engineering,Central South University,Changsha 410083,China)

机构地区：[1]中南大学材料科学与工程学院,湖南长沙410083

出　　处：《兵器材料科学与工程》2022年第5期131-135,共5页Ordnance Material Science and Engineering

基　　金：与企业合作横向课题(143010100)。

摘　　要：为探究42CrMoA螺栓热模锻成型过程中R角微裂纹的形成原因,对微裂纹进行分析。用酸蚀观察锻造流线分布,用金相显微镜和扫描电镜对裂纹形貌、显微组织及裂纹处成分进行研究。用有限元分析软件DEFORM对模锻过程仿真模拟,分析成型过程R角处应力及金属流动情况。结果表明:螺栓模锻前的加热过程表面氧化,靠近基体部位产生了尖锐的氧化产物,破坏了基体表面连续性,造成尖锐处应力集中。裂纹处于模锻过程分流面上,垂直裂纹扩展方向的分力使R角处产生微裂纹。In order to explore the reasons for the formation of R-corner microcracks during the hot forging process of 42CrMoA bolts,the microcracks were analyzed.The forging streamline distribution was observed by the acid etching method,and the crack morphology,microstructure and components at the crack were studied by metallographic microscope and scanning electron microscope.The finite element analysis software DEFORM was used to simulate the die forging process to analyze the stress and metal flow at the R corner during the forming process.The results show that the surface of the bolt is oxidized during the heating process before die forging,and sharp oxidation products produce near the substrate,which destroys the continuity of the substrate surface and causes stress concentration at the sharp point.And the crack is on the split surface of the die forging process,the component force perpendicular to the crack propagation direction causes micro-cracks at the R-corner.

关 键 词：风电叶片螺栓 42CrMoA 模锻 微裂纹 有限元模拟 

分 类 号：TG142.1[一般工业技术—材料科学与工程]