The Effect of Long-Term Heating on Thermal Stability of Ultra-Fine Grained Titanium Alloy VT8M-1 Processed by Rotary Swaging

2021 ◽  
Vol 1016 ◽  
pp. 1398-1403
Author(s):  
Andrey Stotskiy ◽  
Tatyana Vitalyevna Yakovleva ◽  
Grigory Dyakonov ◽  
Alexander V. Polyakov ◽  
Irina Semenova
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Ti Alloy ◽  
Fine Grained ◽  
Rotary Swaging ◽  
Ultrafine Grained ◽  
High Level ◽  
Thermal Stability Of

The paper focuses on the analysis of microstructure and mechanical properties of the Ti alloy VT8М-1 (Ti-5.3Al-4.0Mo-1.2Zr-1.3Sn-0.2Si) in an ultrafine-grained (UFG) state subjected to a long-term annealing at a service temperature of (≤ 450°С). A rotary swaging (RS) was used to process an UFG state in the material. The precipitation of disperse silicides of S2 was observed after the deformation by RS. It has been shown that the UFG alloy retained its high level of thermal stability and enhanced mechanical properties after long-term annealing up to 500 hours. The role of disperse silicides in both strengthening and stability of mechanical properties in the alloy after long-term annealing is discussed.

scholarly journals Thermal Stability of Titanium Alloy VT8M-1 with Ultrafine-Grained Structure

2020 ◽  
Vol 321 ◽  
pp. 11026
Author(s):  
A.G. Stotskiy ◽  
A.V. Polyakov ◽  
G.S. Dyakonov ◽  
I.P. Semenova
Keyword(s):  
Thermal Stability ◽  
Coarse Grained ◽  
Structural Elements ◽  
Electronic Microscopy ◽  
Rotary Swaging ◽  
Long Duration ◽  
Ultrafine Grained ◽  
Equiaxed Grains ◽  
Thermal Stability Of

The paper considers the effect of a long-duration heating at a service temperature of 450oC on VT8M-1 with a coarse-grained (CG) and ultrafine-grained (UFG) microstructure. A duplex ultrafine-grained microstructure, composed of equiaxed grains of primary α-phase and an ultrafine constituent of α- and β-phases, was processed by thermal treatment and further rotary swaging. This type of a microstructure demonstrates a best combination of strength and ductility at room temperature in comparison with the CG structure. A thermal stability of an UFG state was studied at 450°C for 50, 100, 200, 300, 400, and 500 hours. The evolution of the alloy microstructure against the duration of heating was considered by transmission electronic microscopy (TEM), scanning electronic microscopy (SEM). No increase in the alloy structural elements and strength decrease resulting from a long-term annealing (up to 500 hours) at T=450°C have been observed. This proves a high thermal stability of the UFG structure and mechanical properties of VT8M-1 processed via rotary swaging.

Thermal Stability of the Structure and Mechanical Properties of Fine-Grained Aluminum Conductor Alloys Al–Mg–Zr–Sc(Yb)

2020 ◽  
Vol 2020 (9) ◽  
pp. 987-998
Author(s):  
V. N. Chuvil’deev ◽  
A. V. Nokhrin ◽  
Ya. S. Shadrina ◽  
A. V. Piskunov ◽  
V. I. Kopylov ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Fine Grained ◽  
Thermal Stability Of

Dynamic Mechanical Properties and Thermal Stability of PTT/POE/OMMT Nanocomposites

2011 ◽  
Vol 366 ◽  
pp. 306-309
Author(s):  
Ming Tao Run ◽  
Na Li ◽  
Bing Tao Xing ◽  
Meng Yao ◽  
Wen Zhou
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Dynamic Mechanical Properties ◽  
Thermal Gravimetric ◽  
Dynamic Mechanical ◽  
Thermal Gravimetric Analyzer ◽  
Transmission Electron ◽  
Reinforcing Agent ◽  
Thermal Stability Of

The dynamic mechanical properties, phase morphology and thermal stability of the poly(trimethylene terephthalate)/maleinized poly(octene-ethylene)/organo-montmorillonite nanocomposites (PTT/POE/OMMT) were investigated by using the thermodynamic mechanical analyzer (DMA), transmission electron microscopy (TEM) and thermal gravimetric analyzer (TGA), respectively. The results suggest that the modulus of elasticity of the PTT/POE/OMMT nanocomposite increases, and the glass transition temperature first slightly decreases and then increases with increasing OMMT content because that the TPP plays the role of plasticizer and OMMT plays the role of reinforcing agent. OMMT disperse evenly in the polymer matrix with most of the strip-like sheet morphology. The addition of the OMMT does not apparently affect the thermal stability of the PTT/POE/OMMT nanocomposite.

Long Term Thermal Stability of Several Gas Turbine Alloys

2005 ◽  
Author(s):  
L. M. Pike ◽  
S. K. Srivastava
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Gas Turbine ◽  
Operating Costs ◽  
Turbine Engines ◽  
Gas Turbine Engines ◽  
Haynes 230 ◽  
One Year ◽  
Thermal Stability Of

Ever increasing demands for lower gas turbine operating costs have led to the need for longer lasting components. This in turn, requires the availability of alloys which are reliable to such long lifetimes. In the mill produced condition, most alloys have desirable microstructures and mechanical properties. However, after exposure to the harsh temperatures found in gas turbine engines, the microstructures of most alloys will begin to change. The effects on the mechanical properties of such microstructural changes can range from mild deterioration to significant degradation. In this paper, the effects of thermal exposures at temperatures from 1200 to 1600°F for durations up to one year on the mechanical properties of three wrought gas turbine alloys will be reported. The alloys will include HAYNES® 188 alloy (Co-Ni-Cr-W), HAYNES 230® alloy (Ni-Cr-W), and HAYNES HR-120® alloy (Fe-Ni-Cr-Nb-N).

Effect of Phosphorus on Mechanical Properties and Thermal Stability of Fine-grained GH761 Alloy

2011 ◽  
Vol 27 (6) ◽  
pp. 539-545 ◽  
Author(s):  
Shulin Yang ◽  
Wenru Sun ◽  
Jianxi Wang ◽  
Zhimei Ge ◽  
Shouren Guo ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Fine Grained ◽  
Thermal Stability Of

scholarly journals Role of different lignin systems in polymers: mechanical properties and thermal stability

2020 ◽  
Vol 22 (4) ◽  
pp. 10-16
Author(s):  
Gvlmira Hasan ◽  
Dilhumar Musajan ◽  
Gong-bo Hou ◽  
Mingyu He ◽  
Ying Li ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Differential Scanning Calorimetry ◽  
Thermal Properties ◽  
Induction Time ◽  
Crystallization Rate ◽  
Scanning Calorimetry ◽  
Oxidation Induction Time ◽  
Thermal Stability Of

AbstractLignin was used to study the mechanical properties and thermal stability of polymers. The lignin was blended with three kinds of polymers, and the addition of lignin was 0.5 wt%. Under the condition of thermal oxidation, the thermal stability of lignin/polymer samples varies with the structure of lignin. The effects of lignin on the mechanical properties and thermal stability of the polymers were investigated by oxidation induction time (OIT), rheological properties, mechanical properties and differential scanning calorimetry (DSC). The results show that the effect of lignin on the thermal properties of polymer samples is 2~3°C. It can be inferred that lignin can effectively improve the interaction between polymer molecular chain segments, and improve the crystallization rate and rigidity to a certain extent, so it can be seen that lignin has good compatibility and thermal stability.

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