Modeling the anisotropy of hot plastic deformation of two-phase titanium alloys with a colony microstructure

The influence of various factors on the efficiency of microstructure refinement in two-phase titanium alloys with respect to a well-known Ti-6Al-4V alloy was discussed. The kinetics of microstructure evolution in titanium alloys with a lamellar type α/β microstructure during large plastic deformation depends mainly on temperature and strain rate, type of the initial microstructure, thickness of the α lamellae, path of deformation and chemical composition. Each parameter should be controlled to provide the most efficient microstructure refinement during conventional metalforming methods.

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The Role of Martensitic Transformation in Thermomechanical Development of Microstructure and Plasticity of Two-Phase Ti-6Al-4V Titanium Alloy

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.687.3 ◽

2016 ◽

Vol 687 ◽

pp. 3-10 ◽

Cited By ~ 1

Author(s):

Maciej Motyka ◽

Jan Sieniawski ◽

Waldemar Ziaja

Keyword(s):

Plastic Deformation ◽

Titanium Alloy ◽

Martensitic Transformation ◽

Titanium Alloys ◽

Thermomechanical Processing ◽

Solution Treatment ◽

Phase Morphology ◽

Two Phase ◽

Α Phase ◽

Hot Plasticity

Phase constituent morphology in microstructure of two-phase α+β titanium alloys is determined by conditions of thermomechanical processing consisting of sequential heat treatment and plastic deformation operations. Results of previous research indicate that particularly solution treatment preceding plastic deformation significantly changes α-phase morphology and determines hot plasticity of titanium alloys. In the paper thermomechanical processing composed of β solution treatment and following hot forging of Ti-6Al-4V titanium alloy was analysed. Development of martensite plates during heating up and hot deformation was evaluated. Microscopic examinations revealed that elongated and deformed α-phase grains were fragmented and transformed into globular ones. Significant influence of martensitic transformation on elongation coefficient of α-phase grains after plastic deformation was confirmed. Based on results of elevated temperature tensile tests it was established that α-phase morphology in examined two-phase α+β titanium alloy, developed in the thermomechanical processing, can enhance their hot plasticity – especially in the range of low strain rates.

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Formation of Nanocrystalline Structure in Two-Phase Titanium Alloys by Warm Severe Plastic Deformation

Ultrafine Grained Materials II ◽

10.1002/9781118804537.ch14 ◽

2013 ◽

pp. 113-122 ◽

Cited By ~ 2

Author(s):

G.A. Salishchev ◽

M.A. Murzinova ◽

S.V. Zherebtsov ◽

R.M. Galeyev ◽

O.R. Valiakhmetov

Keyword(s):

Plastic Deformation ◽

Severe Plastic Deformation ◽

Titanium Alloys ◽

Nanocrystalline Structure ◽

Two Phase

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The Effect of α-Phase Grains Morphology in Initial Microstructure on Superplasticity of Two-Phase Titanium Alloys

Materials Science Forum ◽

10.4028/www.scientific.net/msf.838-839.143 ◽

2016 ◽

Vol 838-839 ◽

pp. 143-149 ◽

Cited By ~ 1

Author(s):

Maciej Motyka ◽

Jan Sieniawski

Keyword(s):

Plastic Deformation ◽

Titanium Alloys ◽

Superplastic Deformation ◽

Thermomechanical Processing ◽

Ti6al4v Alloy ◽

Two Phase ◽

Fine Grained ◽

Β Phase ◽

Α Phase ◽

Heating Up

It is generally accepted that fine-grained and equiaxed microstructure enables superplastic deformation of two-phase titanium alloys. Appropriate microstructure is usually developed in the thermomechanical processing with careful selection of the parameters of plastic deformation and heat treatment. Based on results of own research in this area increased superplasticity was found in Ti6Al4V alloy having microstructure containing highly deformed and elongated α-grains – considerably different from equiaxed ones. It was found that during heating up and first stage of superplastic deformation fragmentation of elongated α-phase grains occurred, followed by formation and growth of globular grains of that phase. Particular role of quenching of the Ti6Al4V alloy from the stable β-phase temperature range in thermomechanical processing was identified. It leads to increase of elongation coefficient of α-phase grains after plastic deformation but also restrains nucleation of the precipitates of secondary α-phase in further stages of thermomechanical processing. It was established that developed phase morphology of the alloy determined its hot plasticity – especially in the range of low strain rates typical for superplastic deformation.

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The effect of plastic deformation on martensite decomposition process in Ti-6Al-4V alloy

MATEC Web of Conferences ◽

10.1051/matecconf/202032112034 ◽

2020 ◽

Vol 321 ◽

pp. 12034

Author(s):

Maciej Motyka ◽

Waldemar Ziaja ◽

Anna Baran-Sadleja ◽

Karol Slemp

Keyword(s):

Plastic Deformation ◽

Titanium Alloys ◽

Scientific Literature ◽

Thermal Analyses ◽

Compressive Load ◽

Two Phase ◽

Temperature Range ◽

Α Phase ◽

Heat Treated ◽

Kinetics Of

Microstructure and mechanical properties of heat treated martensitic two-phase α+β titanium alloys are in major perspective determined by results of martensite decomposition during tempering. The process of martensitic α’(α”) phase decomposition in titanium alloys, although utilized in industry for years, has not been sufficiently characterized in the scientific literature. Especially aspects of plastically deformed martensite decomposition is poorly described. Preliminary research results of water quenched Ti-6Al-4V alloy, subsequently cold deformed in compression and tempered at the temperature range of 600-900ºC for 1 and 2 h indicated that α’(α”) martensite undergoes strain hardening and deformed martensite laths exhibit tendency towards fragmentation and spheroidization during tempering at 900ºC. In the present paper, also α’(α”) martensite decomposition under compressive load applied at the temperature range of 600-900ºC is considered too. Based on light and scanning electron microscopy observations, thermal analyses and XRD measurements, the effect of plastic deformation on kinetics of martensite decomposition and morphology of α phase formed in the process is analysed.

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Hot Plastic Deformation of Titanium Alloys Reflected on Process Maps

Russian Metallurgy (Metally) ◽

10.1134/s0036029520130030 ◽

2020 ◽

Vol 2020 (13) ◽

pp. 1575-1578

Author(s):

V. I. Alekseev ◽

B. K. Barakhtin ◽

G. A. Panova

Keyword(s):

Plastic Deformation ◽

Titanium Alloys ◽

Hot Plastic Deformation ◽

Process Maps

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Microstructural Characterization Of Quenched And Plastically Deformed Two-Phase α+β Titanium Alloys

Archives of Metallurgy and Materials ◽

10.1515/amm-2015-0345 ◽

2015 ◽

Vol 60 (3) ◽

pp. 2033-2038 ◽

Cited By ~ 2

Author(s):

M. Motyka ◽

J. Sieniawski ◽

W. Ziaja ◽

G. Mrówka-Nowotnik

Keyword(s):

Heat Treatment ◽

Plastic Deformation ◽

Titanium Alloys ◽

Thermomechanical Processing ◽

Microstructural Characterization ◽

Two Phase ◽

Deformation Degree ◽

Plastic Deformation Process ◽

Deformation Processes

Abstract Development of microstructure in two-phase α+β titanium alloys is realized by thermomechanical processing – sequence of heat treatment and plastic working operations. Analysis of achieved results indicates that hot plastic deformation – depending on deformation degree – causes significant elongation of α phase grains. Following heat treatment and plastic deformation processes lead to their fragmentation and spheroidization. Characterization of microstructure morphology changes during thermomechanical processing of quenched Ti-6Al-4V and Ti-6Al-2Mo-2Cr alloys is presented in the paper. The effect of martensitic phase α’(α”) on microstructure development in plastic deformation process was confirmed.

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Modification of Mechanical Properties of High-Strength Titanium Alloys VT23 and VT23M Due to Impact-Oscillatory Loading

Metals ◽

10.3390/met9010080 ◽

2019 ◽

Vol 9 (1) ◽

pp. 80 ◽

Cited By ~ 5

Author(s):

Mykola Chausov ◽

Janette Brezinová ◽

Andrii Pylypenko ◽

Pavlo Maruschak ◽

Liudmyla Titova ◽

...

Keyword(s):

Mechanical Properties ◽

Titanium Alloys ◽

High Strength ◽

The Self ◽

Self Organization ◽

Two Phase ◽

Rolled Metal ◽

Technological Method ◽

Equilibrium Processes ◽

Production Conditions

A simple technological method is proposed and tested experimentally, which allows for the improvement of mechanical properties in sheet two-phase high-strength titanium alloys VT23 and VT23M on the finished product (rolled metal), due to impact-oscillatory loading. Under impact-oscillatory loading and dynamic non-equilibrium processes (DNP) are realized in titanium alloys, leading to the self-organization of the structure. As a result, the mechanical properties of titanium alloys vary significantly with subsequent loading after the realization of DNP. In this study, the test modes are found, which can be used in the production conditions.

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