Effect of severe plastic deformation on creep behaviour and microstructure changes of P92 at 923 K

Processing by severe plastic deformation (SPD) may be defined as such metals forming procedure in which a very high strain is imposed on a bulk material. This paper investigates the effect of different equal channel angular pressing (ECAP) routes and number of ECAP passes on resulting microstructure, mechanical properties and creep behaviour of selected materials. The distinction between various ECAP routes (A, B and C) and the difference in number of ECAP passes applied may lead to variations both in the macroscopic distortions of the individual grains and in the capability to develop a reasonably homogeneous and equiaxed ultrafine-grained microstructure. Experimental materials were processed by ECAP at room temperature using a die with an internal angle of 90° between the two parts of the channel. The ECAP pressing was performed by different routes up to 12 ECAP passes. Tensile creep tests were conducted at temperatures 473 - 673 K and at different applied stresses on ECAP materials and, for comparison purposes, on their unpressed states. Microstructure of samples was characterized by scanning electron microscope (SEM) equipped with the electron backscatter diffraction (EBSD) unit. In conclusion, the ECAP processing route and number of applied ECAP passes could play an important role in creep behaviour and their effect may be different for particular materials. The highest differences in processing routes were revealed for materials especially at lower number of ECAP passes. However, a little apparent dependence of the creep properties was observed during subsequent pressing.

Download Full-text

STRUCTURE OF A NI3AL SINGLE CRYSTAL AFTER SEVERE PLASTIC DEFORMATION

Автометрия ◽

10.15372/aut20190204 ◽

2019 ◽

Keyword(s):

Plastic Deformation ◽

Severe Plastic Deformation ◽

Single Crystal

Download Full-text

Severe plastic deformation of Al-1%Cu Alloy processed by a Simple Cyclic Extrusion Compression technique

International Journal of Computational Physics Series ◽

10.29167/a1i1p77-90 ◽

2018 ◽

Vol 1 (1) ◽

pp. 77-90

Author(s):

Walaa Abdelaziem ◽

Atef Hamada ◽

Mohsen A. Hassan

Keyword(s):

Mechanical Properties ◽

Plastic Deformation ◽

Severe Plastic Deformation ◽

Deformation Behavior ◽

Cast Alloy ◽

Surface Hardness ◽

Grain Structure ◽

Compression Technique ◽

Cu Alloy ◽

Cyclic Extrusion Compression

Severe plastic deformation is an effective method for improving the mechanical properties of metallic alloys through promoting the grain structure. In the present work, simple cyclic extrusion compression technique (SCEC) has been developed for producing a fine structure of cast Al-1 wt. % Cu alloy and consequently enhancing the mechanical properties of the studied alloy. It was found that the grain structure was significantly reduced from 1500 µm to 100 µm after two passes of cyclic extrusion. The ultimate tensile strength and elongation to failure of the as-cast alloy were 110 MPa and 12 %, respectively. However, the corresponding mechanical properties of the two pass CEC deformed alloy are 275 MPa and 35%, respectively. These findings ensure that a significant improvement in the grain structure has been achieved. Also, cyclic extrusion deformation increased the surface hardness of the alloy by 49 % after two passes. FE-simulation model was adopted to simulate the deformation behavior of the material during the cyclic extrusion process using DEFORMTM-3D Ver11.0. The FE-results revealed that SCEC technique was able to impose severe plastic strains with the number of passes. The model was able to predict the damage, punch load, back pressure, and deformation behavior.

Download Full-text

Increasing the strength of technical titanium VT1-0 by severe plastic deformation

Проблемы машиностроения и надежности машин ◽

10.31857/s023571190002560-7 ◽

2018 ◽

pp. 54-60

Author(s):

V. Latysh ◽

◽

I. Burlakov ◽

D. Zabelian ◽

A. Alimov ◽

...

Keyword(s):

Plastic Deformation ◽

Severe Plastic Deformation

Download Full-text

TECHNOLOGIES FOR MANUFACTURING NANOSTRUCTURED SURFACES

Наука. Исследования. Практика: сборник избранных статей по материалам Международной научной конференции (Санкт-Петербург, Октябрь 2020) ◽

10.37539/srp293.2020.47.48.010 ◽

2020 ◽

Author(s):

Андрей Дмитриевич Бухтеев ◽

Виктория Буянтуевна Бальжиева ◽

Анна Романовна Тарасова ◽

Фидан Гасанова ◽

Светлана Викторовна Агасиева

Keyword(s):

Plastic Deformation ◽

Surface Modification ◽

Severe Plastic Deformation ◽

Pressing Pressure ◽

Pressure Treatment ◽

Structured Surfaces ◽

Nanostructured Surfaces ◽

Angular Pressing ◽

Multilayer Composites ◽

Compaction Of Powders

В данной статье рассматривается применение и технологии получения наноструктурированных поверхностей. Рассмотрены такие методы как компактирование порошков (изостатическое прессование, метод Гляйтера), интенсивная пластическая деформация (угловое кручение, равноканальное угловое прессование, обработка давлением многослойных композитов) и модификация поверхности (лазерная обработка, ионная бомбардировка). This article discusses the application and technology for obtaining nano-structured surfaces. Methods such as compaction of powders (isostatic pressing, Gleiter method), severe plastic deformation (angular torsion, equal-channel angular pressing, pressure treatment of multilayer composites) and surface modification (laser treatment, ion bombardment) are considered.

Download Full-text