Effect of cooling recrystallization annealing treatment on properties of an initial aged deformed GH4169 superalloy

2021 ◽  
pp. 142232
Author(s):  
Ming-Song Chen ◽  
Quan Chen ◽  
Yu-Min Lou ◽  
Y.C. Lin ◽  
Hong-Bin Li ◽  
...  
Keyword(s):  
Annealing Treatment ◽  
Recrystallization Annealing ◽  
Gh4169 Superalloy

Fabrication and mechanical properties of ultrafine structured dissimilar laminated metal composite sheets (LMCS)

2015 ◽  
Vol 22 (1) ◽  
pp. 71-79 ◽  
Author(s):  
Zejun Chen ◽  
Quanzhong Chen ◽  
Qing Liu ◽  
Zheng Zhou ◽  
Guojun Wang
Keyword(s):  
Mechanical Properties ◽  
Annealing Treatment ◽  
Grain Structure ◽  
Ultrafine Grain ◽  
Recrystallization Annealing ◽  
Metal Composite ◽  
Treatment Technology ◽  
Cold Rolled ◽  
Ultrafine Grain Structure

AbstractThe ultrafine grain structure is very difficult to fabricate by severe plastic deformation (SPD) for metals with poor formability. In this paper, a fabrication technology of ultrafine structured dissimilar laminated metal composite sheets (LMCS) was developed for poor plastic metals which have low elongation by hot accumulative roll bonding (ARB) in conjunction with cold rolling. The hot ARBed 1100/7075 LMCS was cold rolled at room temperature after recrystallization annealing treatment. An ultrafine structured dissimilar LMCS was obtained without undergoing severe cold rolled deformation. The mechanical properties were enhanced and optimized by using heat treatment technology. The accelerated refining mechanism of grain was revealed by microstructure characterization of the composite sheet. The enhanced strength was mainly derived from the fine layers, refined grains, increased dislocation accumulation, and abundant dispersoids. The results of the research are helpful in improving the mechanical properties of dissimilar LMCS and optimizing the preparation technology.

Orientation Evolution and Nucleation Mechanism of UFG-Copper Prepared by SD-AARB with Heat Treatment

2010 ◽  
Vol 33 ◽  
pp. 163-167 ◽  
Author(s):  
Jun Li Wang ◽  
Qing Nan Shi
Keyword(s):  
Heat Treatment ◽  
Pure Copper ◽  
Reduction Rate ◽  
Cube Texture ◽  
Annealing Treatment ◽  
Rolling Process ◽  
High Energy ◽  
Recrystallization Annealing ◽  
Deformation Method ◽  
Copper Strip

Ultra-Fine-Grained (UFG) copper strip was prepared by severe deformation method of asymmetrical accumulative rolling bond (SD-AARB) with heat treatment, in which the reduction rate of 1.08 was employed with 50% rolling reduction by six passes(4.8 true strains). The heat treatment was conducted at annealing temperature of 220°C for 5~55 minutes. EBSD and X-ray diffraction were employed to follow the features of texture and orientations. The texture formulation mechanism of deformed copper recrystallized nucleation was studied. The results show that the deformation textures developed in the copper strip by SD-AARB are very similar to those by common the cold rolling process, which is {112}<111>. After the annealing treatment, the strength of the main texture components in the oxygen-free pure copper is decreased along with the extension of recrystallization annealing time, which is C,R,S and B/G texture components. For high energy release rate, grains of all kinds of orientations have the chance of nucleation and growing up, which is different to traditional recrystallized cube texture.

scholarly journals Effects of Double-Stage Annealing Parameters on Tensile Mechanical Properties of Initial Aging Deformed GH4169 Superalloy

Materials ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4339
Author(s):  
Guanqiang Wang ◽  
Mingsong Chen ◽  
Yongcheng Lin ◽  
Yumin Lou ◽  
Hongbin Li ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
High Temperature ◽  
Fracture Mode ◽  
Room Temperature ◽  
Shear Fracture ◽  
Annealing Treatment ◽  
Tensile Tests ◽  
Uniaxial Tensile ◽  
Water Cooling ◽  
Gh4169 Superalloy

This study takes large size samples after hot-upsetting as research objects and aims to investigate the optimization double-stage annealing parameters for improving the mechanical properties of hot-upsetting samples. The double-stage annealing treatments and uniaxial tensile tests for hot-upsetting GH4169 superalloy were finished firstly. Then, the fracture mode was also studied. The results show that the strength of hot-upsetting GH4169 superalloy can be improved by the double-stage annealing treatment, but the effect of annealing parameters on the elongation of GH4169 alloy at high temperature and room temperature is not significant. The fracture mode of annealed samples at high-temperature and room-temperature tensile tests is a mixture of shear fracture and quasi-cleavage fracture while that of hot-upsetting sample is a shear fracture. The macroscopic expressions for the two fracture modes belong to ductile fracture. Moreover, it is also found that the improvement of strength by the double-stage annealing treatment is greater than the single-stage annealing treatment. This is because the homogeneity of grains plays an important role in the improvement of strength for GH4169 superalloy when the average grain size is similar. Based on a comprehensive consideration, the optimal annealing route is determined as 900 °C × 9–12 h(water cooling) + 980 °C × 60 min(water cooling).

Fabrication of Mg Alloy Single Crystals Containing Rare Earth Elements and their Mechanical Behavior

2014 ◽  
Vol 783-786 ◽  
pp. 380-383
Author(s):  
Jung Ho Moon ◽  
Tae Kwon Ha
Keyword(s):  
Single Crystal ◽  
Single Crystals ◽  
Annealing Treatment ◽  
Hardness Measurement ◽  
Mg Alloy ◽  
Recrystallization Annealing ◽  
Recrystallization Behavior ◽  
Compression Tests ◽  
X Ray Diffraction ◽  
Microstructure Observation

Single crystals of Magnesium alloys such as Mg-1Zn-0.5Y, Mg-0.1Y, and Mg-0.1Ce alloys were fabricated in this study by employing the modified Bridgman method. To determine the exact orientation of crystals, pole figure measurement using X-ray diffraction was carried out on each single crystal. Hardness and compression tests were conducted followed by subsequent recrystallization annealing. Recrystallization behavior of Mg alloy single crystals has also been investigated. Fabricated single crystals were deformed in compression mode by 30% reduction. Annealing treatment has been conducted on these samples at temperatures of 300°C for various times from 1 to 20 mins. The microstructure observation and hardness measurement conducted on the recrystallized specimens revealed that static recrystallization of ternary alloy single crystal was very slow, while recrystallization behavior of binary alloy single crystals appeared to be very fast.

Morphological transformations in solution-cast Styrene-Butadiene-Styrene (SBS) triblock copolymer thin films

1995 ◽  
Vol 53 ◽  
pp. 184-185
Author(s):  
Ginam Kim ◽  
W. Marsillo ◽  
M. Libera
Keyword(s):  
Thin Films ◽  
Triblock Copolymer ◽  
Annealing Treatment ◽  
Minor Component ◽  
Solvent Evaporation ◽  
Single Crystal Substrate ◽  
Transparent Films ◽  
Crystal Substrate ◽  
Solution Cast ◽  
Morphological Transformations

The fact that block copolymers can assume a range of morphologies depending upon such variables as relative block length and molecular weight is now well known. In the case of poly(styrene)[PS]-poly(butadiene)[PB]-poly(styrene) (SBS) triblock copolymer, the morphologies range from spheres (roughly ~20% minor component), to cylinders (roughly 20%~35% minor component), to lamellae (roughly equal component fractions) Most recently, there has been increasing interest in transformations between morphologies by thermal annealing. This paper describes initial results studying the effect of solvent evaporation rate and post-casting annealing treatment on the morphology of SBS thin films.TEM specimens were prepared by solution casting electron transparent films. 50 μl of 0.1 wt% SBS (30% styrene, Mw=14,000, Scientific Polymer Products, Inc.) dissolved in toluene was deposited on a polished NaCl single crystal substrate placed in a small dish. After solvent evaporation the film was cut into small squares, floated from the salt in water, and each square was collected on a Cu grid.

The microstructure change of low-carbon electrical steels by residual aluminum

1989 ◽  
Vol 47 ◽  
pp. 286-287
Author(s):  
C.K. Hou ◽  
C.T. Hu ◽  
Sanboh Lee
Keyword(s):  
Annealing Treatment ◽  
Low Carbon ◽  
Electrical Steels ◽  
Vacuum Degassing ◽  
Spherical Inclusions ◽  
Residual Aluminum ◽  
Average Grain Size ◽  
The Matrix ◽  
Fine Size ◽  
To Come

The fully processed low-carbon electrical steels are generally fabricated through vacuum degassing to reduce the carbon level and to avoid the need for any further decarburization annealing treatment. This investigation was conducted on eighteen heats of such steels with aluminum content ranging from 0.001% to 0.011% which was believed to come from the addition of ferroalloys.The sizes of all the observed grains are less than 24 μm, and gradually decrease as the content of aluminum is increased from 0.001% to 0.007%. For steels with residual aluminum greater than 0. 007%, the average grain size becomes constant and is about 8.8 μm as shown in Fig. 1. When the aluminum is increased, the observed grains are changed from the uniformly coarse and equiaxial shape to the fine size in the region near surfaces and the elongated shape in the central region. SEM and EDAX analysis of large spherical inclusions in the matrix indicate that silicate is the majority compound when the aluminum propotion is less than 0.003%, then the content of aluminum in compound inclusion increases with that in steel.

Characterisation of planar crystal defects in Y2Fe17Cx (0.6 ≤ x ≤ 1.6) magnetic material by High Resolution Electron Microscopy

1990 ◽  
Vol 48 (4) ◽  
pp. 774-775
Author(s):  
W. Coene ◽  
F. Hakkens ◽  
T.H. Jacobs ◽  
K.H.J. Buschow
Keyword(s):  
Electron Microscopy ◽  
High Resolution ◽  
Permanent Magnets ◽  
Annealing Treatment ◽  
High Resolution Electron Microscopy ◽  
Crystal Defects ◽  
Ordered Structure ◽  
X Ray ◽  
Planar Crystal ◽  
Resolution Electron

Intermetallic compounds of the type RE2Fe17Cx (RE= rare earth element) are promising candidates for permanent magnets. In case of Y2Fe17Cx, the Curie temperature increases from 325 K for x =0 to 550 K for x = 1.6 . X ray and electron diffraction reveal a carbon - induced structural transformation in Y2Fe17Cx from the hexagonal Th2Ni17 - type (x < 0.6 ) to the rhombohedral Th2Zn17 - type ( x ≥ 0.6). Planar crystal defects introduce local sheets of different magnetic anisotropy as compared with the ordered structure, and therefore may have an important impact on the coercivivity mechanism .High resolution electron microscopy ( HREM ) on a Philips CM30 / Super Twin has been used to characterize planar crystal defects in rhombohedral Y2Fe17Cx ( x ≥ 0.6 ). The basal plane stacking sequences are imaged in the [100] - orientation, showing an ABC or ACB sequence of Y - atoms and Fe2 - dumbbells, for both coaxial twin variants, respectively . Compounds resulting from a 3 - week annealing treatment at high temperature ( Ta = 1000 - 1100°C ) contain a high density of planar defects.

TEM study of buried cobalt disilicide layers formed by ion implantation: Identification of cobalt monosilicide inclusions

1990 ◽  
Vol 48 (4) ◽  
pp. 576-577
Author(s):  
A. De Veirman ◽  
J. Van Landuyt ◽  
K.J. Reeson ◽  
R. Gwilliam ◽  
C. Jeynes ◽  
...  
Keyword(s):  
Ion Implantation ◽  
Annealing Treatment ◽  
Silicon On Insulator ◽  
High Dose ◽  
Nitrogen Flow ◽  
Cobalt Disilicide ◽  
Transmission Electron ◽  
Beam Heating ◽  
Co Concentration ◽  
Silicon On Insulator Technology

In analogy to the formation of SIMOX (Separation by IMplanted OXygen) material which is presently the most promising silicon-on-insulator technology, high-dose ion implantation of cobalt in silicon is used to synthesise buried CoSi2 layers. So far, for high-dose ion implantation of Co in Si, only formation of CoSi2 is reported. In this paper it will be shown that CoSi inclusions occur when the stoichiometric Co concentration is exceeded at the peak of the Co distribution. 350 keV Co+ ions are implanted into (001) Si wafers to doses of 2, 4 and 7×l017 per cm2. During the implantation the wafer is kept at ≈ 550°C, using beam heating. The subsequent annealing treatment was performed in a conventional nitrogen flow furnace at 1000°C for 5 to 30 minutes (FA) or in a dual graphite strip annealer where isochronal 5s anneals at temperatures between 800°C and 1200°C (RTA) were performed. The implanted samples have been studied by means of Rutherford Backscattering Spectroscopy (RBS) and cross-section Transmission Electron Microscopy (XTEM).

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