Microstructural banding in thermally and mechanically processed titanium 6242

  • 36 Pages
  • 4.92 MB
  • English
Titanium alloys -- Metallography., Titanium forgings., Titanium alloys -- Thermal properties., Titanium alloys -- Mechanical proper
Statementby Utkarsh Kansal.
The Physical Object
Pagination36 leaves, bound ;
ID Numbers
Open LibraryOL15208305M

Description Microstructural banding in thermally and mechanically processed titanium 6242 PDF

Microstructural banding in thermally and mechanically processed titanium Public Deposited. and slow cooled to ambient temperature. Macroscopic and microstructural banding is observed in some forged and solution annealed coupons, that consists of regions of elongated primary alpha.

Classically, banding in TiSi has been Cited by: 3. Ti-6Al-2Sn-4Zr-2MoSi coupons were shaped by repeated cycles of heating (to °) and hammer or press forging followed by a solution anneal that varied from to °. The coupons were originally extracted from billets forged below the beta transus ( °) and slow cooled to ambient temperatures.

Macroscopic and microstructural banding is observed in some forged and solution Cited by: 3. Microstructural banding in thermally and mechanically processed titanium Kansal, U.; Kassner, M. E.; Hiatt, D. R.; Bristow, B. Abstract. Ti-6Al-2Sn-4Zr-2MoSi coupons were shaped by repeated cycles of heating (to °) and hammer or press forging followed by a solution anneal that varied from to °.

Cited by: 3. MICROSTRUCTURAL BANDING IN THERMALLY AND MECHANICALLY PROCESSED TITANIUM INTRODUCTION Titanium alloys are widely used in different technical applications because of their light weight, high temperature strength and favorable corrosion properties.

In gas turbine engines, compressor blades are made of TiSi andare capable of operating at. HAZ banding in titanium AM was first reported by Kobryn and Semiatin [] to be caused by re-heating of the substrate material to close to the β transus temperature (T β).In a more detailed subsequent study by Kelly and Kampe [32,33], on Ti6Al4V samples produced by an LMD system, the microstructure variation across each HAZ band was described in terms of coarsening of the α lamellar Cited by: SLM is a complex thermal process during which fabricated components are subject to a range of thermal phenomena, including directional heat extraction, repeated melting and rapid solidification [5.

The focus of the paper is the comparison of different modeling strategies of a numerical analysis for the LFW process of Ti-6Al- 4V titanium alloy, for which the thermal aspect strongly influences. The clinical success of modern medical implants depends on the integration with the bone to resist functional loading [].Their mechanical properties depend on the manufacturing process or thermal and mechanical treatments, processes that can change the microstructure [].The stainless steels (iron-based alloys), Co and Ti alloys are very useful for medical implants.

TiAl alloys can be thermal-mechanically processed to 4 types of microstructures: equiaxed (near γ), duplex, nearly lamellar, and fully lamellar. Microstructural variables like equiaxed γ volume fraction and grain size, α 2 /γ colony size and orientation, and α 2 /γ lamellae width all have a significant influence on mechanical properties.

The microstructural evolution is a strong function of various FSW process parameters that influence the thermal cycle. The recrystallized grain size is typically in the range of 1–10 µm. By carefully controlling the process parameters and/or tool size, it is possible to obtain bulk nanocrystalline materials.

Bansal, M.E. Kassner, D.R. Hiatt, and B.M. Bristow, Microstructural Banding in Thermally and Mechanically Processed TitaniumJ. Perform., Vol 1. Because process annealing treat-ments usually are less closely co-n trolled than solution treating and aging, more property variability or “scatter” will occur in annealed alloys.

Nevertheless, many titanium alloys are placed in service in the annealed condition. Phase stability:In beta and alpha-beta titanium alloys, thermal insta. Introduction.

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Thermal interface grooving (TIG) is an important microstructural evolution phenomenon in the field of material synthesis and processing, such as the directional solidification of pure cu (Maeda et al., ) and the multi-crystalline silicon (Hu et al., ), the growth of thin nickel(Ni) films (Amram et al., ) and the breakdown of titanium alloy with lamellar colony.

Banding in Steel “Banded microstructure, or banding, is the microstructural condition manifested by alternating bands of quite different microstructures aligned parallel to the rolling direction of [hot rolled] steel products.” [3, p. ] In many cases these bands consist of ferrite and pearlite, but this is not always the case.

The present study focuses on the effect of microstructural gradients on the fatigue crack growth resistance of Ti-6Al-4V and Ti titanium alloys.

Sharp microstructural gradients from fine. The processing maps at different strains were established for the fine- and coarse-grained alloys.

The optimal processing parameter for hot processing was attained to be °C/10 −3 s −1 for fine-grained alloys and °C/10 −3 s −1 for coarse-grained alloys, respectively. Full article. the workpiece material used, whereas the machining of titanium alloys is a thermal dominant process and a critical temperature of C can be considered as a tool life criterion [ 36 ].

Purpose of this paper was to investigate the phenomenon of microstructural banding in three titanium alloys: Ti-6Al-4V, TiV-2Fe-3Al and Ti-3Al-8V-6Cr-4Mo-4Zr. Design/methodology/approach: The microstructure of the investigated materials in as-delivered condition was characterized.

Moreover, at the aluminum side the thermal-mechanically affected zone (TMAZ) and the heat affected zone (HAZ) appeared like in the traditional FSW-joints. But, at the titanium side, a recrystallization band with a width of 6–10 μm and a layer with fibrous structures are found at the joint interface.

1. Introduction. Ti–6Al–2Sn–4Zr–2Mo (Ti) is a near-α titanium alloy designed in the late s for high-temperature service [].Ti is of interest to the aerospace industry for providing superior mechanical performance to Ti–6Al–4V at elevated temperatures [].Aluminum is an active α-stabilizing element in Ti, while Tin often works with aluminum for solution.

Abstract. The effect of microstructural anisotropy on the mechanical behavior of a hot rolled Ti-6Al-4V alloy has been investigated.

Quasi-static and dynamic experiments in compression and tension were conducted on specimens with their deformation axis aligned along the rolling (RD), transverse (TD), and through thickness (TT) directions.

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processing is effective in improving the mechanical response of pure titanium. In the author's past study, in-situ formed titanium oxide (TiO2) dispersion strengthening and grain refining were applied to improve the mechanical properties of pure titanium.

The obtained material had the mean grain size of μm and oxygen content of ppm. Lütjering's 75 research works with 1, citations and 2, reads, including: The effect of notch plasticity on the behaviour of fatigue cracks emanating from edge-notches in high-strength β. The microstructure of a-p titanium alloys such as TI-6Al-4V can be significantly varied by alloying elements, processing parameters and heat treatment conditions.

Mechanical properties are sensitive to such microstructural variations [3]. Solution heat treating and aging (STA) is applied in a-p titanium alloys to obtain high strength which. In this work, friction stir lap welding (FSLW) and ultrasonic-assisted friction stir lap welding (UAFSLW) was applied to 6-mm-thick T6 alloy sheets using three welding tools with the same process parameters.

The joint formation, microstructural characteristics, and mechanical properties of the resulting lap joints were then investigated. In monolithic aluminum alloys, changes in the processing conditions (e.g., hot and warm working, cold working, rolling, etc.) significantly affect the mechanically induced residual stresses, while quenching and heat treatment produce thermal residual stresses and the precipitation of second phases which possess lattice parameters different than.

Microstructure is the very small scale structure of a material, defined as the structure of a prepared surface of material as revealed by an optical microscope above 25× magnification. The microstructure of a material (such as metals, polymers, ceramics or composites) can strongly influence physical properties such as strength, toughness, ductility, hardness, corrosion resistance, high/low.

Two-phase titanium alloys constitute very important group of structural materials used in aerospace applications [].Microstructure of these alloys can be varied significantly in the processes of plastic working and heat treatment allowing for fitting their mechanical properties including fatigue behaviour to the specific requirements [].The main types of microstructure are (1) lamellar.

The Influence of Hot Working Process on Mechanical Properties of Ti~3Al-Ti Dual Alloy Welded by Electron Beam Welding in Vacuum On the Mechanical Behavior and Microstructural Evolution of a TiAl Alloy under Quasistatic and Dynamic Compression Friction and Wear Performance of a Thermal Oxidation Treated Titanium Aluminide.

Xia, J. / Li. This paper is aimed at identifying key microstructural parameters that play important roles in the failure initiation of polycrystalline Ti subjected to creep and dwell loading. A finite element model, incorporating rate dependent elastocrystal plasticity, is developed for analyzing evolving variables in material microstructure.

Pilot-scale plate rolling experiments and laboratory thermomechanical processing experiments were carried out to understand the mechanism of microstructural banding in low-carbon microalloyed steels.

The microstructural banding originates with large elongated austenite grains, which are present at the roughing stage of rolling.

The large austenite grains develop when conditions favour abnormal.Tanrikulu, Ahmet Alptug, "Microstructure and Mechanical Properties of Additive Manufacturing Titanium Alloys After Thermal Processing" (). Dissertations and Theses.wrought titanium in the PIM-formed specimens, but that maximum elongation was less than expected.

Chemical and microstructural analyses indicate that this process does not add oxygen to the material, suggesting that the use of higher purity powder and further process optimization should lead to significant improvements in ductility. D