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2020 Vol. 63, No. 16
Published: 2020-08-15
FEATURE
FORUM
C0NTENTS
COVER STORY
APPROACHING SCIENCE
SPECIAL TOPIC
 
       FEATURE
14 Cracking Analysis of Powder Metallurgy Ti2AlNb Component During Heat Treatment
XU Lei,WU Jie,CUI Xiaoxiao,GUO Ruipeng,YANG Rui
DOI: 10.16080/j.issn1671-833x.2020.16.014
One cracking Ti2AlNb powder metallurgy near net shape forming component after solution heat treatment is analyzed in this paper. Slight capsule gas leakage during hot isostatic pressing (HIPing) has been investigated, the results show that the high-temperature and high-pressure argon during the hot isostatic pressing is introduced into the capsule. Argon will not be dissolved or be absorbed within titanium alloy and the argon existed in the form of uncombined element in titanium alloys causing pore defects which are harmful for the mechanical properties of the material. These pores are expanded to form temperature induced pores (TIP pores) during heat treatment, and this usually results in damage to the mechanical properties of the material, which may also cause cracking of the material. Ti2AlNb alloys belong to brittle materials, which are sensitive to notches. Once cracks are formed, they propagate rapidly and then cause cracking.
2020 Vol. 63 (16): 14-20 [Abstract] ( 247 ) HTMLNew PDF (16370 KB)  ( 101 )
       COVER STORY
22 Research Progress on Mechanism and Application of Vibration Assisted Plastic Forming
ZHANG Haidong, DENG Lei, WANG Xinyun, JIN Junsong
DOI: 10.16080/j.issn1671-833x.2020.16.022
Vibration assisted plastic forming, which can help to reduce the forming load, improve the formability of metallic materials and refine the surface quality of formed parts compared with traditional processes, is an advanced process with broad application prospects and has made great progress in recent years. Vibration assisted plastic forming effects and related mechanism are introduced, constitutive modeling and numerical simulation of vibration assisted forming are summarized. In addition, vibration assisted plastic forming processes as well as the apparatus of ultrasonic vibration and low-frequency vibration are reviewed. Finally, the problems and development trends in vibration assisted plastic forming mechanism and application are discussed.
2020 Vol. 63 (16): 22-31 [Abstract] ( 253 ) HTMLNew PDF (3208 KB)  ( 815 )
       FORUM
34 Influence of Diameter Growth Speed on Microstructural Evolution During Radial-Axial Ring Rolling of IN718 Alloy
TANG Xuefeng,WANG Baoyu,WANG Xinyun
DOI: 10.16080/j.issn1671-833x.2020.16.034
Mixed crystal and local coarse grain often appeared during radial-axial ring rolling of IN718 alloy, which impeded the satisfaction to the stern service requirement of aircraft engine. This article derived the mathematic model of steady rolling condition and the synergistic radial-axial feeding of ring rolling process based on the constant ring growth speed, and established a multi-physical finite element model of radial-axial ring rolling with adaptive roller control. A unified constitutive model of IN718 alloy based on internal state variables including dislocation density, recrystallization fraction and grain size was employed to investigate the effect of diameter growth speed on the microstructural evolution of radial-axial ring rolling of IN718 alloy by finite element simulation. The results showed that under the steady rolling condition, higher average temperature could be obtained by using higher diameter growth speed, which facilitated the nucleation and growth of the recrystallized grains. Moreover, the rolling time was decreased with the increasing diameter growth speed, the fraction of recrystallization was then decreased since there was insufficient time for growth of dynamic recrystallized grains. As a result, the total fraction of recrystallization was increased at early stage and then was decreased with the increase of diameter growth speed after the diameter growth speed exceeds 4.0mm/s.
2020 Vol. 63 (16): 34-44 [Abstract] ( 193 ) HTMLNew PDF (23947 KB)  ( 103 )
45 Study on Formation Mechanism of Casting Defects in Directionally Solidified Blades of DZ22B Superalloy
LI Zhenfeng,HU Bing,ZHONG Wenhui,OUYANG Xuemei,LI Fei,WANG Xinming,LEI Sixiong,ZHOU Jian,YIN Fucheng
DOI: 10.16080/j.issn1671-833x.2020.16.045
The characteristics and the reason of its formation of casting defects in different areas of directional solidified turbine blades of DZ22B nickel base superalloy were investigated by means of SEM and EDS. The results show that the crack defects are mainly distributed in the middle and upper parts of the blade body, and its formation mechanism is mainly due to the excessive eutectic structure of the blade during the solidification process. While the loose defects are distributed in the blade body and the edge plate, and are generated in the dendrite near the eutectic structure. The small gap between dendrites and insufficient filling and the CO gas generated by the reaction not released in time are the two main reasons for the formation of looseness.
2020 Vol. 63 (16): 45-49/58 [Abstract] ( 223 ) HTMLNew PDF (2461 KB)  ( 587 )
49 Research Progress of Rapid Solidification Phase Field Simulation in Additive Manufacturing
QIU Yi,WANG Junsheng
DOI: 10.16080/j.issn1671-833x.2020.16.050
The property of materials is largely controlled by its microstructure, and the ideal microstructure can be realized by optimizing the forming process. Additive manufacturing is a typical non-equilibrium solidification process, which is also an emerging near-net-shape manufacturing technology. In the non-equilibrium solidification process, dendrite growth is difficult to directly observe, and phase field simulation can effectively predict the dynamic evolution of crystal structure with process change. This paper summarizes the application of phase field simulation in additive manufacturing and points out its development trend, which can provide a reference for the phase field simulation research in the rapid solidification of additive manufacturing.
2020 Vol. 63 (16): 49-57 [Abstract] ( 170 ) HTMLNew PDF (14594 KB)  ( 116 )
59 Hot Isostatic Pressing of Large Thin-Wall Cylindrical Structure of Inconel 718 Ring
WU Jie, XU Lei, CUI Xiaoxiao, CUI Yuyou, SUN Wenru, YANG Rui
DOI: 10.16080/j.issn1671-833x.2020.16.059
Pre-alloyed Inconel 718 powder was prepared by electrode induction melting gas atomization (EIGA) and then characterized. Powder metallurgy (PM) Inconel 718 alloys was prepared through a typical hot isostatic pressing (HIPing) route and its mechanical properties were tested. The mechanical properties were close to that of forgings. The numerical simulation of hot isostatic pressing of Inconel 718 ring was carried out by using the finite element method. Combined with the capsule design, the whole near net shape of PM Inconel 718 complex structure parts was realized.
2020 Vol. 63 (16): 59-64 [Abstract] ( 235 ) HTMLNew PDF (10225 KB)  ( 118 )
       APPROACHING SCIENCE
66 Break International Technology Blockade, Serve for Great National Strategy
2020 Vol. 63 (16): 66-67 [Abstract] ( 151 ) HTMLNew PDF (382 KB)  ( 267 )
       SPECIAL TOPIC
68 Numerical Calculation and Analysis of Friction Ignition Characteristics of Aero-Engine Titanium Alloy at Micro-Scale
MI Guangbao, LIANG Xianye, LI Peijie,CAO Jingxia, HUANG Xu
DOI: 10.16080/j.issn1671-833x.2020.16.068
The abnormal friction between the vane and the casing is the main heat source of titanium fire in the aero-engine. In this paper, micro-protrusion / micro-debris of aero-engine titanium alloy friction ignition process is taken as the research object, a micro-scale ignition model considering friction heat source is established, and the influence rules of particle size, friction coefficient, oxygen concentration and flow velocity are calculated and analyzed, and compared with the classic model. The results show that the critical ignition temperature and delay time continue to decrease with decreasing particle size, increase with decreasing friction coefficient, decrease with increasing oxygen concentration, and increase with increasing flow velocity; When the particle size is 82.5μm, the critical ignition temperature of the classic model and friction model are 825K and 677K, respectively, and the ignition delay time is 0.035s and 0.032s respectively; when the friction coefficient decreases by 0.2, the critical ignition temperature increases by about 20K, the ignition delay time increase by about 10s; when the oxygen concentration reached 50%, the ignition temperatures of the classic model and friction model are 826K and 782K, respectively; when the flow velocity is 310m/s, the critical temperatures of the classic model and friction model are 966K and 964K, respectively, the ignition delay time is 0.54s and 0.43s respectively.
2020 Vol. 63 (16): 68-74/85 [Abstract] ( 209 ) HTMLNew PDF (2315 KB)  ( 314 )
74 Modeling and Control of Porosity Defects in Nickel-Based Single Crystal Superalloys: A Review
LIU Keli,WANG Junsheng, GUO Yueling,YANG Yanhong,ZHOU Yizhou,YANG Yuansheng
DOI: 10.16080/j.issn1671-833x.2020.16.075
Nickel-based single crystal superalloy is one of the key materials for turbine blades used for current aeroengines. The porosity defect has a significant influence on the reliability and durability of turbine blades. Conventional experimental analysis is often limited by qualitative rules. Recent developments of numerical simulation and threedimensional characterization techniques facilitate to reveal the formation and evolution mechanisms of porosity defects in Ni-based single crystal superalloys and precisely predict their geometrical features, distribution, and volume fraction. Here we review the research progress on the numerical simulation of porosity defects, and discuss the features of current porosity prediction models. To provide possible guidances for multiscale modeling of porosity formation in nickel-based single crystal superalloys, the potential barriers that prevent quantitative prediction and control of porosity defects from casting to final service are proposed.
2020 Vol. 63 (16): 74-84 [Abstract] ( 193 ) HTMLNew PDF (12467 KB)  ( 95 )
86 Simulation Analysis on High-Pressure Rotor Connection Assembly of One Aero-Engine
FENG Shuo,SUN Shanmin,ZHU Linbo,PEI Shiyuan,CHEN Jin,ZHOU Shuo4
DOI: 10.16080/j.issn1671-833x.2020.16.086
The high-pressure rotor is the core component of the turbofan engine, and its vibration problem is always prominent. It is very important and urgent to research the complex relationship between the assembly process data, the final technical state, and the vibration response for the high-pressure rotor. In this paper, a certain type of aero-engine highpressure combined rotor has been selected as the analysis object, and it is composed of a high-pressure compressor rotor and a high-pressure turbine rotor. The typical geometric characteristics and unbalanced parameters are used, and taking vibration response as the evaluation target, the comparative analysis of three high-pressure rotor connection and assembly methods have been conducted based on the stacking mechanism and dynamic modeling method. The influences of flat runout and unbalance on the vibration response have also been studied. The presented work provides the theoretical support for assembly process optimization to a certain extent, and hopes to supply some reference or inspiration for vibration trouble shooting of the aero-engine.
2020 Vol. 63 (16): 86-94 [Abstract] ( 254 ) HTMLNew PDF (7249 KB)  ( 112 )
95 Analysis and Elimination of High-Pressure Rotor Balancing Process Problems
SUN Guiqing,MA Feng,YU Zhiguo,YANG Fali,SONG Shulin
DOI: 10.16080/j.issn1671-833x.2020.16.095
Accurate rotor balancing is an important measure to reduce the fundamental frequency vibration of engine. For the large balance error in the high-pressure rotor of a certain engine, based on the analysis of the rotor structure and the individual balancing process, it is judged to be caused by low shape and position accuracy of the simulation rotor balance tooling through the comparison test and the position tolerance check in the simulation rotor balance. Therefore, the optimized combined balance process method is built, and the principle of high-pressure compressor blades adjustment and counterweight installation optimization are put forward. The application results show that the methods can meet the engine vibration requirement and effectively reduce the balance error of the high-pressure rotor, which is providing reference for the following application of high-pressure rotor combination balance for other engines.
2020 Vol. 63 (16): 95-101 [Abstract] ( 260 ) HTMLNew PDF (1626 KB)  ( 416 )
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