Hardening of welded joints in titanium alloys, produced by electron-beam welding

Khorev, M. A.

doi:10.1007/bf00741896

Cited by 3 publications

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“…In this regard, the welded titanium pairs were aged at 500 and 550 °C for 8 hours without preliminary quenching, followed by cooling in air. Typical aging schedules were taken for thermal hardening titanium alloys [17][18]. Research methods include microdurometry, optical microscopy and X-ray diffraction analysis.…”

Section: Methodsmentioning

confidence: 99%

Aging of the OT4-VT23, VT6-VT23, VT19-VT23 Titanium Welded Pairs

Илларионов

Koemets

Гриб

2021

DDF

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The structure, the phase composition and microhardness over the section of welded joints aged at 500 and 550 °C have been studied by means of structural and microdurometric analyzes. The welded joints of OT4-VT23, VT6-VT23 and VT19-VT23 titanium alloys pairs were obtained by the argon-arc welding with a nonconsumable tungsten electrode. It has been established that the aging at 500 °C for 8 hours promotes the decomposition of metastable phases (b, a”) which formed after welding in the welded joint of VT19-VT23 titanium alloys pair. The decomposition process leads to strengthening of the main zones of the welded joint (except for the parent metal of VT23 alloy) and provides a favorable smooth change of microhardness in the joint during the transition from one alloy to another. The aging at 500 and 550 °C during 8 hours of the welded joints of OT4-VT23, VT6-VT23 titanium alloys pairs also led to the development of the decomposition of metastable phases (b, a”, a’) in the weld and heat affected zones of the alloys being joined, but did not provide the required monotonic change in microhardness over the cross section of the joint.

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Section: Methodsmentioning

confidence: 99%

Aging of the OT4-VT23, VT6-VT23, VT19-VT23 Titanium Welded Pairs

Илларионов

Koemets

Гриб

2021

DDF

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“…Alloy (a+b)-Ti-3Al-1.3Mo-2.7V-0.8Cr-0.6Fe, containing b-stabilisers in the amount equal to 6% of molybdenum, with the temperature of complete polymorphous transformation T p = 880°C, density 4600 kg/m 3 , has the following mechanical properties after quenching from (T p -50) °C + ageing (550°C, 10 h): s B pm = 1128 MPa ( pm = 65°), s B pm /g = 25 km, s B w = 1118 MPa ( w = 55°), s B w /g = 24.7 km. 4. Alloy (a+b)-Ti-6Al-1.3Mo-2.7V-0.8 Cr-0.6 Fe, containing b-stabilising elements as in the alloy No.…”

Section: Examination Of the Effect Of Complex Alloying On The Mechanimentioning

confidence: 99%

“…In this article, the results are presented of investigations with the evaluation of the mechanical and technological properties, the strength of the alloys, and also the economic aspects of the investigated tasks [3][4][5][6][7] .…”

Section: Requirements Imposed On Titanium Alloysmentioning

confidence: 99%

Complex alloying and heat treatment of titanium alloys

Khorev

2008

Welding International

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To cite this article: A.I. Khorev (2008) Complex alloying and heat treatment of titanium alloys, Welding International, 22:6, 364-368, IntroductionThe currently available structural titanium alloys and filler materials ensure high reliability of welded structures.In future, advanced aircraft systems will be produced from titanium alloys with the strength level of 1100 MPa and the specific strengths of s B /g > 24 km, with considerably higher efficiency in comparison with aluminium alloys and steels. The welded structures will prevail in this area because they are characterised by higher technological properties in manufacture and by higher values of the coefficient of utilisation of the metal. Therefore, the level of the mechanical properties of the welded joints is the main factor which determines the prospects of using structural titanium alloys 1-3 . Requirements imposed on titanium alloysThe following requirements are imposed on the currently available titanium alloys:-the tensile strength of semifinished products (sheets, plates, forgings, stamped products, etc) should not be lower than 1100 MPa;-the tensile strength of the welded joint s B w > 0.9 s B pm (s B w > 990 MPa); -the specific strength should be s B /g > 24 km (the commercial unit reflecting the length of the filament capable of holding its mass without fracture); -relatively low cost because of the cost of materials is one of the main components of the cost of the component as a whole;-universal nature in the manufacture of all types of semifinished products and production of all types (welded, brazed and monolithic) structure; -sufficient resources in the country and the possibility of large-scale production;-good weldability and technological efficiency in welding;-technological plasticity and the possibility of producing components of the required shape by hot, isothermal or cold stamping followed by heat treatment in dies or special devices;-high technological properties in heat treatment (energy requirement, labour content, complexity of the process); -high technological efficiency in machining of components.Specific strength is the main characteristic which determines the weight efficiency and a decrease in the weight of the structures.To obtain the required weight efficiency of the welded structure, two directions may be followed:-increase of the strength of the parent material at s B w / s B pm = 0.9; -increase of the value s B w / s B pm ; -at a specific strength of 24 km, the specific strength of the welded joint should be in the range 0.9-24 km, which corresponds to 21.6 km.If the ratio of the strength values of the welded joint and the parent metal is increased from 0.9 to 0.95 by improving welding, the given task may be solved at a specific strength of the parent material of 21.6/ 0.95 = 22.73 km. The strength of the ternary metal can be achieved in VT23 (VT23M) alloys in the annealed condition and the weight efficiency, required by the designer, can be reached.Special attention should be given by the designers and technologists to ...

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Structure And Properties Of Heat-resistant Pseudo-α-titanium Alloy Of Ti-al–sn–zn–mo–v– Si System And Its Welded Joints

Grigorenko¹,

Belous²,

Taranova³

et al. 2019

Sovrem. elektrometall.

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Исследованы структура жаропрочного псевдо-α-титанового сплава и особенности формирования структуры сварных соединений, полученных электронно-лучевой сваркой с разной фокусировкой луча. Слиток опытного титанового сплава выплавляли способом электронно-лучевой тигельной плавки с электромагнитным перемешиванием. Такой способ позволяет получать гомогенный расплав и после его охлаждения однородные по химическому составу слитки. Изучены влияние параметров луча на форму и структуру металла шва, а также стойкость к образованию трещин в титановом жаропрочном сплаве. Определены механические свойства соединений при разных режимах электронно-лучевой сварки исследуемого сплава. Библиогр. 11, табл. 2, рис. 8.

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Hardening of welded joints in titanium alloys, produced by electron-beam welding

Cited by 3 publications

References 0 publications

Aging of the OT4-VT23, VT6-VT23, VT19-VT23 Titanium Welded Pairs

Aging of the OT4-VT23, VT6-VT23, VT19-VT23 Titanium Welded Pairs

Complex alloying and heat treatment of titanium alloys

Structure And Properties Of Heat-resistant Pseudo-α-titanium Alloy Of Ti-al–sn–zn–mo–v– Si System And Its Welded Joints

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