Thermal Stability of Ti-6Al-4V Alloy with Carbon Content

2015 ◽  
Vol 226 ◽  
pp. 23-28
Author(s):  
Agnieszka Szkliniarz
Keyword(s):  
Carbon Content ◽  
Operating Temperature ◽  
Solution Treatment ◽  
Aging Treatment ◽  
Hardness Test ◽  
Two Phase ◽  
Microstructure Stability ◽  
The Stability ◽  
Thermal Stability Of

In the paper, the effect of long-term annealing (to 500 h) on the microstructure and hardness of two-phase titanium alloy which represent group of α+β (Ti-6Al-4V) with 0.7 wt. % carbon content was present. The stability of microstructure after long-term annealing was conducted to alloys in hardening state (after solution treatment and aging). Annealing was carried out at a temperature above the operating temperature of commercial titanium alloys without carbon content. The analysis of changes in the microstructure at research range of annealing time indicates its stability, which was confirmed by hardness test of investigated alloys. For comparison to Ti-6Al-4V-0.7C alloy, the microstructure stability research at 420oC was conducted for classical alloy contain no carbon. This alloy was previously subject solution and aging treatment under the same conditions as tested alloy.

scholarly journals Corrosion Resistance of INCONEL Alloy 617 in Simulated Gas Turbine Environments

1992 ◽  
Author(s):  
P. Ganesan ◽  
G. D. Smith ◽  
D. H. Yates
Keyword(s):  
Gas Turbine ◽  
Cyclic Oxidation ◽  
Operating Temperature ◽  
High Temperature Strength ◽  
Alloy 617 ◽  
Turbine Engine ◽  
Nickel Chromium ◽  
The Stability ◽  
Thermal Stability Of

It is known that the efficiency of a gas turbine engine can be improved substantially by increasing the operating temperature. However, increasing the temperature puts a tremendous demand on the performance of materials of construction such as the combustion chamber, transition ducts etc. The material has to be resistant to long-term isothermal and cyclic oxidation conditions. In addition, the thermal stability of the alloy is of utmost importance. INCONEL® alloy 617 is a solid solution, nickel - chromium - cobalt - molybdenum alloy with an exceptional combination of high-temperature strength and oxidation and carburization resistance. In this paper, the performance of alloy 617 in isothermal and cyclic oxidation, carburization and burner rig oxidation/sulfidation environments will be presented. In addition some mechanical properties data will be included to show the stability of the alloy after exposure to high temperatures for extended periods of time. For comparison the data obtained on such alloys as INCO® alloy HX and Haynes® alloys 188 and 230 will also be reported.

Effect of Heat Treatment on the Microstructural Characteristics of IN738 Turbine Blade

2011 ◽  
Vol 695 ◽  
pp. 405-408 ◽  
Author(s):  
Ho Seob Yun ◽  
Joon Sik Park ◽  
Seong Uk An ◽  
Jeong Min Kim
Keyword(s):  
Solid Solution ◽  
Size Distribution ◽  
Solution Treatment ◽  
Aging Treatment ◽  
Hardness Test ◽  
Treatment Temperature ◽  
Solution Treatment Temperature ◽  
Gamma Prime ◽  
Average Size ◽  
Single Size

It was observed that both primary and secondary gamma prime precipitates were more significantly influenced by the solid solution treatment temperature as compared to the following cooling rate. Single and duplex size precipitate distribution with different average size could be obtained through the appropriate solid solution and aging treatment. Micro-hardness test result indicated that single size distribution of gamma prime precipitates provides higher hardness than duplex size distribution.

The Thermal Stability of a Single-Grain Mg-Zn-Y Icosahedral Quasicrystal

2000 ◽  
Vol 643 ◽  
Author(s):  
Z.P. Luo ◽  
Y.L. Tang ◽  
D.J. Miller ◽  
M.J. Kramer ◽  
I.R. Fisher ◽  
...  
Keyword(s):  
Golden Ratio ◽  
Lattice Parameter ◽  
Icosahedral Quasicrystal ◽  
Face Centered Cubic ◽  
Single Grain ◽  
Face Centered ◽  
The Stability ◽  
Mg Content ◽  
Thermal Stability Of

AbstractThe stability of the Mg-Zn-Y icosahedral quasicrystal (IQC) has been studied by long-term annealing of a single grain IQC in quartz tubes. Decomposition of the IQC was observed after annealing at high temperatures (T≥773 K) sealed in Ar. During the decomposition process, the quasilattice parameter aR was found to decrease, associated with a decrease in Mg content of the IQC phase as confirmed by quantitative x-ray energy dispersive spectroscopy analyses. In addition, a new cubic approximant has been found in the annealed samples. This cubic approximant has a face-centered cubic (fcc) structure with lattice parameter of a = 1.276 nm, which is about (1/τ) times smaller than that of the fcc W'-(MgZnY) with a = 2.05 nm reported previously (where τ is the golden ratio).

SANS study on the stability of oxide nanoparticles in long-term thermally aged 9Cr-ODS steel

2021 ◽  
Author(s):  
Peng-Lin Gao ◽  
Jian Gong ◽  
Qiang Tian ◽  
Gung-Ai Sun ◽  
Hai-Yang Yan ◽  
...  
Keyword(s):  
Oxide Dispersion Strengthened ◽  
Oxide Nanoparticles ◽  
Electron Backscattered Diffraction ◽  
Excellent Thermal Stability ◽  
Ods Steel ◽  
Transmission Electron ◽  
Hardness Tests ◽  
The Stability ◽  
Thermal Stability Of

Abstract A 9Cr-oxide dispersion strengthened (ODS) steel was thermally aged at 873 K for up to 5000 hours. The size distribution and chemical composition of the dispersed oxide nanoparticles were analyzed by small angle neutron scattering (SANS) method under magnetic field. Combined with transmission electron microscopy (TEM), Vickers micro-hardness tests and electron backscattered diffraction (EBSD) measurements, all the results showed that the thermal treatment had little or no effect on the size distributions and volume fractions of the oxide nanoparticles in the ferromagnetic matrix, which suggested excellent thermal stability of the 9Cr-ODS steel.

Effects of Light Soaking Conditions on Thin Film Silicon:Hydrogen Alloy Solar Cells

1986 ◽  
Vol 70 ◽  
Author(s):  
D. R. Willett ◽  
D. P. Tanner ◽  
G. Mchenry
Keyword(s):  
Thin Film ◽  
Solar Cells ◽  
Light Intensity ◽  
Environmental Conditions ◽  
Operating Temperature ◽  
Measurable Effect ◽  
The Stability ◽  
Long Term Performance ◽  
Term Performance

ABSTRACTVariation of environmental conditions during light soaking of thin film silicon:hydrogen alloy (TFS) solar cells can have measurable effect on durability. Such sensitivity must be considered in optimizing processes for maximizing long-term performance. This paper will describe the effects of operating temperature, light intensity, operating bias, and duration of light soaking on the stability of TFS p-i-n solar cells.

scholarly journals Application of Adaptive Evolution to Improve the Stability of Bacteriophages during Storage

Viruses ◽  
2020 ◽  
Vol 12 (4) ◽  
pp. 423
Author(s):  
Kelvin K. Kering ◽  
Xiaoxu Zhang ◽  
Raphael Nyaruaba ◽  
Junping Yu ◽  
Hongping Wei
Keyword(s):  
Heat Treatment ◽  
Adaptive Evolution ◽  
Antibacterial Agents ◽  
Critical Factor ◽  
Wild Type ◽  
The Stability ◽  
Tubular Proteins ◽  
Thermal Stability Of ◽  
General Method

Phage stability is important for the successful application of bacteriophages as alternative antibacterial agents. Considering that temperature is a critical factor in phage stability, this study aimed to explore the possibility of improving long-term phage stability through adaptive evolution to elevated temperature. Evolution of three wild-type ancestral phages (Myoviridae phage Wc4 and Podoviridae phages CX5 and P-PSG-11) was induced by subjecting the phages to heat treatment at 60 °C for five cycles. The adapted phages showed better stability than the wild-type ancestral phages when subjected to heat treatment at 60 °C for 1 h and after 60 days of storage at 37 °C. However, the adapted phages could not withstand thermal treatment at 70 °C for 1 h. The infectivity and the lytic properties of the phages were not changed by the evolution process. Whole-genome sequencing revealed that single substitutions in the tail tubular proteins were the only changes observed in the genomes of the adapted phages. This study demonstrates that adaptive evolution could be used as a general method for enhancing the thermal stability of phages without affecting their lytic activity. Sequencing results showed that bacteriophages may exist as a population with minor heterogeneous mutants, which might be important to understand the ecology of phages in different environments.

Effect of Heat Treatment on the Corrosion Resistance of Cast Mg-7.3Al Alloy

2010 ◽  
Vol 146-147 ◽  
pp. 585-588
Author(s):  
Su Qiu Jia ◽  
Guo Jun Liu ◽  
Qi Shuang Chen
Keyword(s):  
Heat Treatment ◽  
Corrosion Resistance ◽  
Magnesium Alloy ◽  
Solution Treatment ◽  
Aging Treatment ◽  
Microstructural Characterization ◽  
Main Role ◽  
Β Phase

Mg-7.3Al magnesium alloys were investigated in the paper. The paper presents microstructural characterization of Mg-7.3Al alloy after casting and heat treatment. The casting temperature was 740°C and heat treatment was performed at 420 °C for 24 h with aging at 180 °C for 8h,16h,24h. The microstructure of the casting alloy consists of α-Mg phase matrix with a primary β phase (Mg17Al12) at grain boundaries. After solution treatment β phases were soluted in α-Mg phase matrix . Aging treatment caused β phases precipitation. The corrosion resistance of magnesium alloy was determined in 3.5 % NaCl by immersion tests and polarization curves. The results shows that the corrosion resistance of magnesium alloy after solution treat is the best than that of the others heat treatment in polarization curve tests and the samples with aging for 16h and 24h presents higher corrosion resistance than those with solution and aging for 8h in immersion tests. Solution treatment plays a main role for corrosion resistance of Mg-7.3Al magnesium alloy in short term corrosion, but more continuous β phases in Mg-7.3Al alloy after ageing act as a barrier and play a main role in long term corrosion.

scholarly journals Mechanical Properties Enhancement of Al-Si-Cu-Fe Alloy Through Aging Treatment Variations

Metalurgi ◽  
2020 ◽  
Vol 35 (3) ◽  
pp. 105
Author(s):  
Moch Iqbal Zaelana Muttahar ◽  
Shinta Virdhian ◽  
Purbaja Adi Putra ◽  
Dagus Resmana Djuanda ◽  
Eva Afrilinda ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Solid Solution ◽  
Tensile Strength ◽  
Artificial Aging ◽  
Impact Resistance ◽  
Solution Treatment ◽  
Aging Treatment ◽  
Hardness Test ◽  
Single Stage ◽  
Solid Solution Treatment

Al-Si alloys are being widely used as main engine components replacing iron in several parts in the automotive industry. Some of its mechanical properties were a reference in its alloy utilization. In this research, the heat treatment carried out on the specimen included solid solution treatment and the artificial aging process for aluminium alloys. Test pieces were heated on the furnace with a solid solution treatment process at 540 ° C with holding time around 5 hours and quenched at 60 °C with water quenchant, followed by 3 different aging treatment which included single-stage aging, artificial aging with pre-aged, and double stage aging. Tests carried out by hardness test, tensile strength test, impact test, metallographic and Scanning Electron Microscopy-Energy Dispersive Spectroscopy (SEM-EDS) observations. The results of this research showed the differences in phase constituent and morphology microconstituents due to variations of aging. The difference of each treatment could be seen in the morphology of the precipitate that is dispersed, rounded and needle-like shaped, this phase can influence the mechanical properties of Al-Si-Cu alloys. The results of mechanical testing show the highest hardness was obtained by double stage aging treatment 161.27 HRB. The highest tensile strength occurs in specimens with a single-stage aging treatment of 202.56 MPa. The highest impact resistance occurred in samples with the pre-aging treatment of 18.6 J.

scholarly journals Effects of high mechanical treatment and long-term annealing on crystal structure and thermal stability of Ti2O3 nanocrystals

RSC Advances ◽  
2020 ◽  
Vol 10 (43) ◽  
pp. 25717-25720
Author(s):  
Albina A. Valeeva ◽  
Svetlana Z. Nazarova ◽  
Hartmuth Schröttner ◽  
Evgeny Yu. Gerasimov ◽  
Andrey A. Rempel
Keyword(s):  
Crystal Structure ◽  
Thermal Stability ◽  
Magnetic Susceptibility ◽  
Mechanical Treatment ◽  
High Energy ◽  
High Energy Milling ◽  
The Stability ◽  
Thermal Stability Of

The effect of high-energy milling and long-term annealing on the stability of Ti2O3 nanocrystals was studied using a magnetic susceptibility method.

Method-dependent variations in the stability of apolipoprotein B in a stabilized liquid reference material

1994 ◽  
Vol 40 (5) ◽  
pp. 716-722 ◽  
Author(s):  
J V Mei ◽  
M K Powell ◽  
L O Henderson ◽  
S J Smith ◽  
G R Cooper ◽  
...  
Keyword(s):  
Reference Material ◽  
Apolipoprotein B ◽  
Clinical Chemistry ◽  
Immunological Methods ◽  
Apo B ◽  
Human Apolipoprotein ◽  
The Stability ◽  
Measured Mass ◽  
Thermal Stability Of

Abstract Using accelerated Arrhenius-type short-term and long-term temporal studies, we evaluated the storage life of a stabilized, liquid-frozen reference material (SLRM) for human apolipoprotein B (apo B) developed by the International Federation of Clinical Chemistry. As measured by our candidate reference RIA, the concentrations of immunoreactive apo B in the SLRM showed pronounced degradation with exposure to increasing temperatures over time. The SLRM was stable for as long as 1 year when stored at - 70 degrees C, but its immunoreactive apo B declined by < 10% when stored at 4 degrees C for 10 months. Using radial immunodiffusion and an ELISA to assess the equivalency of measured mass for the accelerated thermal stability of the SLRM, we found a loss of immunoreactive apo B similar to that measured by RIA. Analyzing the same samples by liquid immunoprecipitation (nephelometry) resulted in the amount of apo B present being overestimated, especially in samples held for long periods. By using different immunological methods to evaluate this thermally aged SLRM, we demonstrated that its measured behavior varies depending on the method of quantitation.

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