晶粒尺寸对Inconel718薄板塑性微变形行为的影响:实验与建模
Grain size effect on plastic microformation behavior for Inconel 718 foils:Experiment and modeling
纪开盛 1刘艳雄 1张怡俊 1宋燕利 1尹飞 1魏文婷1
作者信息
- 1. Hubei Key Laboratory of Advanced Technology for Automotive Components,Wuhan University of Technology,Wuhan 430070,China;Hubei Engineering Research Center for Green Precision Material Forming,Wuhan University of Technology,Wuhan 430070,China;Hubei Key Collaborative Innovation Center for Automotive Components Technology,Wuhan University of Technology,Wuhan 430070,China
- 折叠
摘要
随着航空航天工业的迅速发展,对微型化Inconel 718薄板构件的需求越来越大.然而,晶粒尺寸显著影响金属薄板的塑性变形行为,在很大程度上限制了Inconel 718薄板构件的生产和应用.本文对不同晶粒尺寸的Inconel 718薄板进行了一系列单轴拉伸试验和扫描电镜实验,研究了晶粒尺寸对其塑性变形行为的影响.通过EBSD技术表征了晶粒尺寸、晶粒取向和晶粒平均取向偏差,阐明了晶粒尺寸效应的变形机制.研究结果表明,随着晶粒尺寸的增大,在拉伸应力作用下,晶粒旋转和协调变形机制减弱,取向转变为<2(3ˉ)2>的晶粒数量逐渐减少,从而导致屈服强度和最大抗拉强度显著降低;此外,随着晶粒尺寸的增大,晶粒内部的塑性变形明显减弱,晶界滑动逐渐成为拉伸过程中主要的变形机制,导致断裂应变减小,韧性断裂特征减弱.本文综合考虑晶粒尺寸和应变量影响,建立了能够应用于Inconel 718薄板的微成形研究的混合材料本构模型.
Abstract
With the rapid development of the aerospace industry,there is an increasing demand for miniaturized parts made of Inconel 718 foils.However,the grain size effect on the plastic deformation behavior of thin sheets is significant,which considerably limits the fabrication and application of micro-components from Inconel 718.In this study,a series of uniaxial tensile tests and scanning electron microscopy experiments were conducted on Inconel 718 foils with different grain sizes to investigate the grain size effect on plastic deformation behavior.The grain size,orientation,and kernel average misorientation were characterized via electron backscatter diffraction to elucidate the deformation mechanism associated with the grain size effect.The results demonstrate that as the grain size increased,the number of grain orientations transforming into<2(3ˉ)2>gradually decreased owing to weakened grain rotation and coordination under tensile stress,leading to a significant reduction in yield strength and maximum tensile strength.Additionally,the plastic deformation within the grain interior diminished significantly,while grain boundary sliding became a prominent deformation mechanism during tension as grain size increased,resulting in decreased fracture strain and ductile fracture characteristics.Finally,a mixed material constitutive model incorporating grain size and strain was developed for microforming research on Inconel 718 foils.
关键词
Inconel718薄板/晶粒尺寸/力学性能/断裂机理/混合材料本构模型Key words
Inconel 718 foils/grain size/mechanical properties/fracture mechanism/mixed material constitutive model引用本文复制引用
基金项目
国家自然科学基金(52275371)
国家重点研发计划(2020YFA0714900)
出版年
2024
NETL
NSTL
万方数据