The Effects of High Tempering Parameters on the Relative Elongation and Yield Strength of 42CrMo Steel as the Turbine Shaft

Presented are the results of mechanical tensile tests of longitudinal (segmental) samples cut from the midsection of claddings spent as VVER-1000 FA during one- and six-year campaigns and subject to thermal tests in helium at 480 °С during 468 full days. An average burnup of these fuel rods achieved ~ 20 and ~ 70 (MW·day)/kg U, respectively. The tests followed the examinations for cladding mechanical properties performed using the tests results for ring samples cut from the specified fuel rods. These fuel rods were tested in the experiments to determine impact of long-term thermal tests that model dry storage conditions on mechanical properties of Zr E110 claddings. Based on mechanical tests results at room temperature and at 380 °С there was determined as follows: ultimate strength sв, yield strength s0,2 and total relative elongation d0 of claddings length-wise on the fuel rod segments at the fuel column midsection. The obtained characteristics were compared to corresponding values for initial (unirradiated) cladding tubes and mechanical test results of the ring samples in the transverse direction. Long-term thermal tests have led to partial return to initial (before operation) values sв, s0,2 and d0 of radiation-hardened claddings; this return was more prominent in the longitudinal direction than in the transverse one. A radiation hardening decrease was accompanied with an increase in total relative elongation values in both cladding directions. Anisotropy of yield strength has changed as well. These changes can be explained by partial annealing of radiation defects, which are obstacles to dislocation movements during cladding strain. The morphology of above radiation defects is different in various sliding planes in texturized grains of cladding material.

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STUDY OF THE EFFECT OF TiB2 PARTICLES ON THE STRUCTURE, DEFORMATION BEHAVIOR, AND PROPERTIES OF THE ALUMINUM ALLOY 1550

Vestnik Tomskogo gosudarstvennogo universiteta Matematika i mekhanika ◽

10.17223/19988621/67/10 ◽

2020 ◽

pp. 102-116

Author(s):

Aleksandr B. VOROZHTSOV ◽

◽

Vladimir V. PLATOV ◽

Aleksandr A. KOZULIN ◽

Anton P. KHRUSTALEV ◽

...

Keyword(s):

Tensile Strength ◽

Ultimate Tensile Strength ◽

Yield Strength ◽

Relative Elongation ◽

Rolling Direction ◽

Strength Properties ◽

Rolled Sheet ◽

Master Alloys ◽

Cast Alloys ◽

Tib2 Particles

In this work, the special master alloys containing aluminum and TiB2 powder with bimodal particle size distribution in three mixture compositions are prepared. The master alloys are infused into the melts using an external ultrasound source. The castings with particles had smaller grain sizes than the initial castings without particles. It is found that the hardness, yield strength, and ultimate tensile strength reach higher values with an increase in the relative elongation of the cast alloys with added particles. A warm rolling mode is employed for the studied alloys to obtain sheet blanks. It is shown that the staged shrinkage of the billets up to deformation of 80 % with periodic heating up to 300 °C allows one to obtain defect-free sheet products. The structure of the rolled sheet-alloys is characterized by the plate-shaped grains elongated along the rolling direction with pockets of submicron-sized grains in between. The strength properties of the studied rolled alloys exceeded those of the cast alloys. In the case of the rolled alloys, an increase in the yield strength, ultimate tensile strength, and ductility is revealed for the alloys with particles as compared to the ones with no particles added.

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Effect of the Lattice Parameter on Brittle Fracture of Metals at Low Temperatures

Materials Science Forum ◽

10.4028/www.scientific.net/msf.989.290 ◽

2020 ◽

Vol 989 ◽

pp. 290-295

Author(s):

Alexander A. Khlybov ◽

Yury G. Kabaldin ◽

Maksim S. Anosov

Keyword(s):

Brittle Fracture ◽

Yield Strength ◽

Low Temperatures ◽

Mechanical Characteristics ◽

Relative Elongation ◽

Lattice Parameter ◽

Strength Increase ◽

Metallic Materials

The paper presents the results of tests of metallic materials at low temperatures. It is shown that with the decreasing of temperature, the mechanical characteristics of materials change significantly: strength limits, yield strength increase, and relative elongation decrease. It is shown that the temperature of the brittle-viscous transition depends on the lattice parameter of the materials. The higher the lattice parameter is, the lower is the temperature of the brittle-viscous transition. It is shown that the lattice parameter can be used to estimate the temperature of the brittle-viscous transition

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Effect of Alloying Elements on the Structure Peculiarities and Mechanical Properties of High-Strength Magnetic Fe-Cr-Co Based Alloys

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.168-169.388 ◽

2010 ◽

Vol 168-169 ◽

pp. 388-391

Author(s):

V.V. Serikov ◽

N.M. Kleinerman ◽

A.V. Vershinin ◽

E.V. Beloserov ◽

N.V. Mushnikov ◽

...

Keyword(s):

Mechanical Properties ◽

Phase Separation ◽

Yield Strength ◽

Relative Elongation ◽

High Strength ◽

Alloying Elements ◽

Effect Of Alloying

Structure and mechanical properties of high-strength alloys on the basis of the Fe-Cr-Co system with W, Ga, Cu and Al additives have been investigated by the Mossbauer technique. It is shown that the magnitude of yield strength is independent of the dopants, whereas the relative elongation is controlled by the process of phase separation in the alloys which is dependent on additions.

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Using of stainless steels in transport

AUTOBUSY – Technika Eksploatacja Systemy Transportowe ◽

10.24136/atest.2018.128 ◽

2018 ◽

Vol 19 (6) ◽

pp. 536-539

Author(s):

Marcin Kułakowski ◽

Krzysztof Rokosz

Keyword(s):

Corrosion Resistance ◽

Yield Strength ◽

Stainless Steels ◽

Hot Rolling ◽

Relative Elongation ◽

Basic Information ◽

Corrosion Properties ◽

Alloy Steels ◽

Mechanical And Corrosion Properties

The article discusses transport applications of most popular stainless steels. The basic information about the production of alloy steels, hot rolling, mechanical and corrosion properties in that paper, are presented. In addition, the plots of yield strength, relative elongation, hardness and corrosion resistance (PREN) for selected stainless steels were shown.

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Influence of Texture on Mechanical Properties of Titanium Alloy Tubes

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.844.182 ◽

2020 ◽

Vol 844 ◽

pp. 182-187

Author(s):

Vira Vakhrusheva ◽

Nataliia Hruzin ◽

Ihor Tiutieriev ◽

Oleksandr Malysh

Keyword(s):

Mechanical Properties ◽

Titanium Alloy ◽

Yield Strength ◽

Ultimate Strength ◽

Relative Elongation ◽

Strain Ratio ◽

Radial Component ◽

Tube Production ◽

Tube Material ◽

Optimal Values

Mechanical properties and texture of tube material formed in the process of tube production were studied. Texture in tubes was estimated by contractile strain ratio (CSR) according to requirements of the standard for tubes. Mechanical properties depend on CSR. Optimal values of mechanical properties were determined: ultimate strength, yield strength and relative elongation which provide CSR values within 1.3...3.5. The texture was evaluated in the process of tube manufacture. An increase in radial component of the texture leads to an increase in CSR. At high CSR values up to 3-3.5, tubes often do not withstand process tests for flattening and bending. Correction of CSR values is required. It was shown that an increase in ductility of tubes increases the value of CSR.

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A β Ti–20Nb–10Ta–5Zr Alloy with the Surface Structured on the Micro- and Nanoscale

Doklady Physics ◽

10.1134/s1028335821010079 ◽

2021 ◽

Vol 66 (1) ◽

pp. 14-16

Author(s):

M. A. Sevostyanov ◽

A. S. Baikin ◽

M. A. Kaplan ◽

A. G. Kolmakov ◽

S. V. Gudkov ◽

...

Keyword(s):

Tensile Strength ◽

Yield Strength ◽

Crystal Lattice ◽

Elemental Composition ◽

Single Phase ◽

Relative Elongation ◽

Alloy Surface ◽

Space Group ◽

Cubic System ◽

Type Crystal

Abstract This alloy is shown to be homogeneous (Ti 65%, Nb 20%, Ta 10%, Zr 5%). A change in the elemental composition is observed only in the layer close to the surface with a thickness of about 100 nm. The alloy surface is depleted in titanium (∼20%) and enriched in tantalum (∼20%). There is also a large amount of oxides on the surface (∼50%). The alloy is single-phase with a β-Ti-type crystal lattice (cubic system, space group Im3m). The alloy has yield strength of about 550 MPa and a tensile strength of about 700 MPa. The Young’s modulus is about 50 GPa. The relative elongation of the alloy is about 1.4%. On a microscale, folds and longitudinal comb-like structures up to 0.5 μm in height are found on the surface of wires and plates made of the Ti–20Nb–10Ta–5Zr alloy. When analyzing nanotopology, it is found that, even between comb-like structures or at their tops, there are irregularities up to 100–150 nm in height.

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