GH4169晶面衍射弹性常数计算与测量  

Measurement and Calculation for Crystal Plane Diffraction Elastic Constants of GH4169

作　　者：陈强[1] 叶益聪[1] 祝昌军 Chen Qiang;Ye Yicong;Zhu Changjun(Department of Materials Science and Engineering,College of Aerospace Science and Engineering,National University of Defense Technology,Changsha 410073,China;Nonferrous Metal Oriented Advanced Structural Materials and Manufacturing Cooperative Innovation Center,Central South University,Changsha 410083,China)

机构地区：[1]国防科技大学空天科学学院材料科学与工程系,湖南长沙410073 [2]中南大学有色金属先进结构材料与制造协同创新中心,湖南长沙410083

出　　处：《稀有金属材料与工程》2021年第9期3169-3175,共7页Rare Metal Materials and Engineering

基　　金：国家重点基础研究计划(2012CB619502);国家科技重大专项(2014ZX04012011)。

摘　　要：根据复相材料细观力学模型,预测了镍基高温合金等效弹性响应,基于宏观应力-应变关系,理论计算了GH4169及组分材料等效弹性性质参数,即等效弹性模量E,等效体积模量K,等效剪切模量G和泊松比n,与文献报道的实验值进行对比分析。结果显示:GH4169合金理论计算值E=218.60 GPa,K=180.20 GPa,G=84.20 GPa,n=0.298与实验值偏差分别为7.16%、10.69%、6.58%、0.67%;γ′相理论计算值E=201.10 GPa,K=173.70 GPa,G=76.93 GPa,n=0.307与实验值偏差分别为1.42%、0.40%、2.00%、1.66%,较小的误差证明了该模型的准确性;进一步,理论预测了镍基高温合金细观弹性响应,基于单轴载荷作用下细观弹性应力-应变关系,理论计算了GH4169合金γ-(Ni-Cr-Fe)相(220)晶面衍射弹性常数,即E_(220)=233.89 GPa,n_(220)=0.284;同时,采用四点弯曲标定载荷应力,结合X射线衍射应变实验测量了γ-(Ni-Cr-Fe)相(_(220))晶面衍射弹性常数,并与理论计算值对比分析。结果表明,实验测量值E_(220)=248.00 GPa、n_(220)=0.276与理论值的偏差分别约为5.69%、2.90%,证实了该理论模型的准确性,也为衍射法测量残余应力研究提供理论基础。According to the micromechanics of composites,the effective elastic respond of Ni-base superalloy was predicted and the parameters of effective elastic properties of GH4169 as well as its constituent materials namely effective elastic modulus E,effective bulk modulus K,effective shear modulus G and Possion’s ration,were also theoretically calculated on the bases of macroscopic stress-strain relationship.Compared with the theoretically calculation and the experimental measurement in article,the results show that the errors of the theoretical calculated values of GH4169 alloy E=218.60 GPa,K=180.20 GPa,G=84.20 GPa,n=0.0298 and the experimental values are 7.16%,10.69%,6.58%,0.67%,respectively;the errors ofγ'phase theoretical calculated values E=201.10 GPa,K=173.70 GPa,G=76.93 GPa,n=0.307 and the experimental values are 1.42%,0.40%,2.00%,1.66%,respectively,which proves the accuracy of the theory.Furthermore,the mesomechanical elastic respond of Ni-base superalloy was predicted in theory and the crystal plane diffraction elastic constants ofγ-(Ni-Cr-Fe)phase of GH4169 alloy,E_(220)=233.89 GPa,n_(220)=0.284 were also calculated theoretically based on mesomechanical stress-strain relationship of Ni-base superalloy under uniaxial loading.Simultaneously,the diffraction elastic constants of the(220)crystal plane ofγ-(Ni-Cr-Fe)phase were experimentally measured with the combination of four-point bending to calibrate the load stress and X-ray diffraction for diffraction strain measurement.Contrasted between the theoretical and experimental,the results demonstrate that the experimental E_(220)=248.00 GPa,n_(220)=0.276 and that difference between the theoretical calculation is 5.69%,2.90%,respectively,which proves the accuracy of the theoretical model and also provides a theoretical basis for the study of residual stress measurement by diffraction method as well.

关 键 词：镍基高温合金 晶面衍射弹性常数 四点弯曲 X射线衍射 

分 类 号：TG146.15[一般工业技术—材料科学与工程]