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Acta Metall Sin  2019, Vol. 55 Issue (8): 987-996    DOI: 10.11900/0412.1961.2019.00013
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Investigation of In Situ 1150 High Temperature Deformation Behavior and Fracture Mechanism of a Second Generation Single Crystal Superalloy
Jinyao MA1,Jin WANG1,Yunsong ZHAO3,Jian ZHANG3,Yuefei ZHANG1(),Jixue LI2,Ze ZHANG2
1. Institute of Microstructure and Property of Advanced Materials, Beijing University of Technology, Beijing 100124, China
2. School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China
3. Key Laboratory of Advanced High Temperature Structural Materials, AECC Beijing Institute of Aeronautical Materials, Beijing 100095, China
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Abstract  

Single-crystal superalloy is the key material of turbine blade and hot end parts in aerospace field. The second generation nickel-based single crystal superalloy has been widely used because of its low cost and excellent high temperature properties. At present, the research on microstructure of superalloys at high temperature mainly depends on SEM and TEM observation after heating and loading experiment. However, such kind of work lacks real-time characterization capabilities. Carrying out in situ experiments has an important significance for understanding the real time deformation behavior and microstructure evolution of superalloys. Therefore, the development of an in situ high temperature (above 1000 ℃) mechanical testing equipment for SEM faces huge challenges. In this work, high temperature tensile experiment at 1150 ℃ of a second generation single crystal nickel-based superalloy were carried out by means of a self-developed in situ heating tensile platform which can used in SEM. A high quality experimental data and serial SEM images were obtained in the course of tensile testing at 1150 ℃. The analysis of force-displacement curve shows that the yield strength and fracture strength of the specimen are 580 and 620 MPa, respectively. The sequential SEM images during this research confirm that there is no obvious shape and size change for γ and γ′ during the elastic deformation, and microstructure changing during plastic stage is mainly due to γ phase widening which is parallel to the stress axis. The results show that the original micro-voids of samples are the weakness in high temperature tensile test at 1150 ℃, the fracture direction is almost perpendicular to the stress axis, the crack propagated by passing the γ′ phase and through in the γ phase, and ultimately, temperature and stress induced adjacent holes connection leading to the sample fracture.

Key words:  nickel-based single crystal superalloy      in situ SEM      high temperature tensile      microstructure      crack     
Received:  16 January 2019     
ZTFLH:  TG132.3  
Fund: Supported by Foundation:National Key Scientific Instrument and Equipment Development Project(No.11327901)
Corresponding Authors:  Yuefei ZHANG     E-mail:  yfzhang@bjut.edu.cn

Cite this article: 

Jinyao MA,Jin WANG,Yunsong ZHAO,Jian ZHANG,Yuefei ZHANG,Jixue LI,Ze ZHANG. Investigation of In Situ 1150 High Temperature Deformation Behavior and Fracture Mechanism of a Second Generation Single Crystal Superalloy. Acta Metall Sin, 2019, 55(8): 987-996.

URL: 

https://www.ams.org.cn/EN/10.11900/0412.1961.2019.00013     OR     https://www.ams.org.cn/EN/Y2019/V55/I8/987

Fig.1  Dimension of in situ SEM heating tensile specimen (unit: mm)
Fig.2  Heating and tensile platform combined with SEM (a) and schematic of heating tensile stage (b)
Fig.3  Over field image of stretch gauge segment (a), composed of γ/γ' microstructure (b), micro pores and small amounts of eutectic structure and inclusion shedding caused holes (c), EDS surface distribution of the rectangular area in Fig.3b (d) (σ—relative standard deviation, w—mass fraction)
Fig.4  Temperature vs voltage curves at samples, force and displacement sensors (Inset shows the local magnification of curves)
Fig.5  Microstructure of nickel-based single crystal superalloy during heating process at 750 ℃ (a), 950 ℃ (b), 1050 ℃ (c), 1150 ℃ (d) and CCD images of in situ tensile stage (e~h) separately corresponding to Figs.5a~d
Fig.6  In situ tensile force-displacement curve of nickel-based single crystal superalloy sample at 1150 ℃
Fig.7  In situ observation of micro hole initiation and sample deformation process under different loading conditions
Fig.8  Evolution process of micro hole on sample surface during tensile yield stage at 1150 ℃ and 620 MPa
Fig.9  SEM images of microstructure at about 500 μm away from fracture surface (a) and near fracture location (b) of nickel-based single crystal superalloy
Fig.10  Crack propagation of nickel-based single crystal superalloy at 600 MPa (a), morphology at 580 MPa corresponding to region I (b), carbides in porous cavities in region II (c), morphology evolution of Fig.10a at 530 MPa (d), and crack propagation between micropores at 500 MPa at different magnification (e, f)
Fig.11  Fractograph of the specimen after high temperature tension at 1150 ℃ (a), regions A and B corresponding to crack source and crack propagation zone respectively, and boxes 1 and 2 in area B showing the microspores (b), and dimples and cleavage plane characteristics of areas I (c) and II (d) on cross section
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