摘要
变形高温合金在发动机涡轮盘等领域应用广泛,目前涡轮盘受到低通量、小粒径砂粒的高速冲蚀产生的磨损现象引起人们的大量关注。本研究针对两种变形高温合金材料GH720Li和GH738,采用SiO2颗粒作为冲蚀粒子,通过改变冲击角度及冲蚀速度,研究实验材料的固体颗粒冲蚀磨损特性。冲击角度分别为:30°, 60°, 90°,冲蚀速度分别为:25, 55 m·s-1。同时,通过ANSYS LS-DYNA有限元模拟软件建立冲蚀磨损动态模型,研究在非线性材料模型中,单颗粒冲击靶材表面时,冲击角度、冲蚀速度对其表面的弹塑性行为的影响。通过实验结果与冲蚀FEM (finite element method)模型的综合分析得出,变形高温合金在受冲蚀磨损过程中,其冲蚀磨损量(损伤速率)和磨损表面变形中有效应力变化有关,并且都与冲蚀速度和冲击角度的依赖关系明显,表明在冲击角度和冲蚀速度的配合下的"切削磨损"和"变形磨损"机制与材料表面与次表层变形行为有内在关系。这为涡轮盘材料与结构设计提供基础数据。
Wrought superalloy materials have been used extensively in the hot-end components of small-scaled aero-engine. During the take-off and flying at low altitude, the components such as turbine disk in the airplane were subjected to an ultrahigh speed erosion by low-flux, small-grained sand particles, making the service life much lower than the expected design life. In the present study, two kinds of wrought superalloys, GH720 Li, GH738, were manufactured respectively. A solid particle erosion test was performed using silica sand particles, at impact angles between 30° and 90° and a particle velocity of 25 and 55 m·s-1. Simultaneously, based on the experimental parameters, a multi-particle dynamic model of erosive wear was established by using ANSYS LS-DYNA software. In order to analyze the elastoplastic behaviors of the target surfaces under the combination effect of impact particles, velocities, and angles, the damage mechanism of single particles impacting on the surface of target materials was developed on a non-linear material model. Through the comprehensive analysis of the experimental results and erosion FEM(finite element method) model, it was shown that the erosion damage and wear surface deformation of deformed high temperature alloys were significantly dependent on the erosion speed and impact angle during the process of erosion and wear, so that the mechanism of "cutting wear" and "deformation wear" in combination with the impact angle and erosion speed was intrinsically related to the deformation behavior of materials surface and provided basic data for the turbine and structural design.
作者
新巴雅尔
文波
曲敬龙
曹夕
Xinba Yaer;Wen Bo;Qu Jinglong;Cao Xi(College of Material Science and Engineering,Inner Mongolia University of Technology,Hohhot 010051,China;Central Iron and Steel Research Institute,Beijing 100081,China;Beijing Key Laboratory of Advanced High Temperature Materials,Beijing 100081,China;Inner Mongolia Key Laboratory of Thin Film And Coatings,Ho-hhot 010051,China)
出处
《稀有金属》
EI
CAS
CSCD
北大核心
2019年第9期911-919,共9页
Chinese Journal of Rare Metals
基金
国家自然科学基金地区基金项目(51665042)资助
