FRACTURE MECHANISM OF 09G2S LOW-ALLOY STEEL WELDED SAMPLE SUBJECTED TO HEAT TREATMENT AND EQUAL CHANNEL ANGULAR PRESSING DURING IMPACT BENDING

2020 ◽  
Vol 2020 (8) ◽  
pp. 28-32
Author(s):  
Afanasiy Ivanov ◽  
Ekaterina Aleksandrova
Keyword(s):  
Alloy Steel ◽  
Equal Channel Angular Pressing ◽  
Fracture Mechanism ◽  
Low Alloy Steel ◽  
Welded Steel ◽  
09G2s Steel ◽  
Angular Pressing ◽  
Impact Area ◽  
Impact Bending ◽  
Micro Dimples

The aim of the work: the investigation of a fracture mechanism in 09G2S low-alloy steel welded sample with K-shaped grooving on a thermal impact area (TIA) after equal channel angular pressing (ECAP) and tempering + ECAP. There are carried out impact bending tests of 09G2S steel welded samples in which Menage incision is carried in the TIA. Micro-fractograms are presented and the analysis of a fracture mechanism in Menage samples of 09G2S steel with welded joints subjected to impact bending at the temperature of 233ºK is carried out. It is shown that the fracture of welded samples subjected to tempering and the ECAP in the TIA is ductile and characterized with the presence of a dimple micro-relief as well as basic metal fracture. In its turn, 09G2S welded steel strengthened by means of the ECAP as a result of impact bending at the temperature of 233ºK is fractured quasi-brittle in the TIA. At the same time there are observed facets of quasi-microchip, micro-cracks and micro-dimples. A mixed fracture is also characteristic expressed in the interchange of brittle and ductile areas.

scholarly journals COMBINING OF MATERIAL STRAIN PROCESSING METHODS

2019 ◽  
Vol 2019 (10) ◽  
pp. 19-24
Author(s):  
Афанасий Иванов ◽  
Afanasiy Ivanov
Keyword(s):  
Uniaxial Tension ◽  
Alloy Steel ◽  
The State ◽  
Strength Increase ◽  
Low Alloy Steel ◽  
Combined Method ◽  
Stress Strain ◽  
Steel 09G2s ◽  
Angular Pressing ◽  
Destruction Mechanism

The purpose of the work consists in the investigation of stress-strain properties and destruction mechanism of low-alloy steel 09G2S subjected to extrusion and uniformly channel angular pressing (UCAP). The combined method of Strain processing consists in the successive use of extrusion methods and UCAP. There is shown an example of low-alloy steel 09G2S strengthening with the use of extrusion and UCAP. There are presented data on stress-strain properties and destruction mechanism of steel 09G2S samples at uniaxial tension at the state of delivery and after strengthening. Strength increase and steel plasticity decrease is shown. On the basis of the results of fractal graphics analysis a viscous character of steel 09G2S destruction at the state of delivery and after extrusion and UCAP is defined.

Tensile properties and fracture mechanism of Al–Mg alloy subjected to equal channel angular pressing

2007 ◽  
Vol 459 (1-2) ◽  
pp. 137-144 ◽  
Author(s):  
D.R. Fang ◽  
Q.Q. Duan ◽  
N.Q. Zhao ◽  
J.J. Li ◽  
S.D. Wu ◽  
...  
Keyword(s):  
Tensile Properties ◽  
Equal Channel Angular Pressing ◽  
Fracture Mechanism ◽  
Mg Alloy ◽  
Angular Pressing

Fracture Mechanism of Thermomechanically Processed Low-Carbon Steel

2015 ◽  
Vol 788 ◽  
pp. 182-186
Author(s):  
Nurguyana D. Petrova ◽  
Afanasiy M. Ivanov
Keyword(s):  
Carbon Steel ◽  
Impact Toughness ◽  
Equal Channel Angular Pressing ◽  
Fracture Mechanism ◽  
Combined Treatment ◽  
Low Carbon Steel ◽  
Low Carbon ◽  
Power Intensity ◽  
Angular Pressing ◽  
Low Temperature Impact Toughness

The article deals with the fracture mechanism of thermomechanically processed low-carbon steel tested at low temperatures The low temperature impact toughness of the low-carbon Fe360 steel was defined in the initial (as delivered) state and after its combined treatment: quenching and equal channel angular pressing (ECAP) as well as quenching, equal channel angular pressing, and annealing. It was stated that the combination of quenching and the equal channel angular pressing provided higher strength and led to increased resistance to brittle fracture. Post-deformation annealing, due to high ductility of the material, allows for higher values of impact toughness and power intensity of fracture.

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