Phase Evolution and Thermal Expansion Behavior of aγ′Precipitated Ni-Based Superalloy by Synchrotron X-Ray Diffraction  

作　　者：Zhiran Yan Qing Tan Hua Huang Hailong Qin Yi Rong Zhongnan Bi Runguang Li Yang Ren Yandong Wang 

机构地区：[1]State Key Laboratory for Advanced Metals and Materials,University of Science and Technology Beijing,Beijing,100083,China [2]Department of Microstructure Physics and Alloy Design,Max-Planck-Institut Für Eisenforschung GmbH,40237,Düsseldorf,Germany [3]Department of Materials,Imperial College London,Kensington,London,SW72AZ,UK [4]Beijing Key Laboratory of Advanced High Temperature Materials,Central Iron and Steel Research Institute,Beijing,100081,China [5]Department of Mechanical Engineering,Technical University of Denmark,2800,Kongens Lyngby,Denmark [6]X-Ray Science Division,Advanced Photon Source,Argonne National Laboratory,Argonne,IL,60439,USA

出　　处：《Acta Metallurgica Sinica(English Letters)》2022年第1期93-102,共10页金属学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(NSFC)(Grant Nos.11805009 and 51921001);the Fundamental Research Funds for the Central Universities(Grant No.06111020)。

摘　　要：The phase evolution and thermal expansion behavior in superalloy during heating play an essential role in controlling the size and distribution of precipitates,as well as optimizing thermomechanical properties.Synchrotron X-ray diffraction is able to go through the interior of sample and can be carried out with in situ environment,and thus,it can obtain more statistics information in real time comparing with traditional methods,such as electron and optical microscopies.In this study,in situ heating synchrotron X-ray diffraction was carried out to study the phase evolution in a typicalγ′phase precipitation strengthened Ni-based superalloy,Waspaloy,from 29 to 1050°C.Theγ′,γ,M_(23)C_(6)and M C phases,including their lattice parameters,misfits,dissolution behavior and thermal expansion coefficients,were mainly investigated.Theγ′phase and M_(23)C_(6)carbides appeared obvious dissolution during heating and re-precipitated when the temperature dropped to room temperature.Combining with the microscopy results,we can indicate that the dissolution of M_(23)C_(6)leads to the growth of grain andγ′phase cannot be completely dissolved for the short holding time above the solution temperature.Besides,the coefficients of thermal expansions of all the phases are calculated and fitted as polynomials.

关 键 词：SUPERALLOY WASPALOY Lattice misfit Coefficients of thermal expansion X-ray diffraction Synchrotron radiation 

分 类 号：TG132.3[一般工业技术—材料科学与工程]