Mechanisms of Plastic Deformation during Laser Heat Treatment of ARMCO Pure Iron

Варавка, В. Н.; Kudryakov, O. V.; Morozkin, Igor S.

doi:10.4028/p-sin6n9

Cited by 3 publications

(1 citation statement)

References 16 publications

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“…The next group of methods is intended for direct determination of heat resistance, taking into account the probability of LR of welded joints, and allows obtaining the most objective quantitative data on the performance of structures at high temperatures. A common method for assessing the tendency of welded joints to local failure is the CKTI method [12], which involves testing cylindrical specimens for long-term pure bending at operating temperatures and various strain rates, typically between 10 and 0.01%/h (Fig. 3).…”

Section: Methodsmentioning

confidence: 99%

Experimental methods for assessing the propensity of welded joints to local fault

Poletaev

Shchepkin²

2023

E3S Web of Conf.

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The problem of increasing the resistance of welded joints of power equipment against local destruction in the conditions of non-stationary mode of high-temperature operation is relevant. In the studies performed, the analysis of the causes and nature of LR was carried out from the standpoint of classical physics of high-temperature deformation and intergrain destruction by the creep mechanism. Most of the test methods developed simulate just such loading conditions. However, the most objective assessment of the susceptibility of the welded joints to LR can be given by the method of testing welded joints under conditions of high-temperature low-frequency low-cycle loading.

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Section: Methodsmentioning

confidence: 99%

Experimental methods for assessing the propensity of welded joints to local fault

Poletaev

Shchepkin²

2023

E3S Web of Conf.

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Micromechanics of small deformations in metal alloys under laser irradiation

Kudryakov¹,

Варавка²,

Nescoromniy³

et al. 2023

Proceeding of the 7th International Conference of Science, Technology, and Interdisciplinary Research (Ic-Star 2021)

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Micromechanics of small deformations in metal alloys under laser irra diation

Matyunin

Kudryakov

Варавка

et al. 2022

Zavod. lab., Diagn. mater.

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Development of the nanomaterial science heightened the interest in studying the deformation mechanism accompanied by grain boundary sliding (GBS). However, the experimental study of GBS processes in micro- and nanovolumes of metallic materials faces difficulties attributed to high localization of strains and requires the use of modern methods and tools of high-resolution electron microscopy. Therefore, the available literature data refer mainly to theoretical and model studies in this area. Treatment of metal alloys with concentrated energy flows, for example, laser irradiation, can impart characteristic features to the grain boundary slip. In this regard, we performed the experimental study of the microplastic deformation of Armco iron with a single-phase ferrite structure under pulsed laser processing. To exclude the effect of phase transformations on the deformation process, only the heat-affected zone (HAZ) was studied. The temperature in HAZ was below the temperature of the first critical point and did not exceed 700°C, which made it possible to consider the total deformation an equivalent of the GBS deformation. The microstructure studies by the methods of optical and scanning electron microscopy revealed that in conditions of ultrafast heating and cooling during laser processing of metal, deformation occurred with the participation of the GBS mechanism. The characteristic features of GBS, i.e., the presence of stepped bound aries and accommodation zones, as well as the appearance of high-angle grain boundaries were observed. A technique is proposed for measuring the strain value through the GBS mechanism under an assumption that the strain vector components for cubic lattices are statistically equal. A statistical analysis of the measurements of the orthogonal component of the strain vector using the secant method was performed, which provided determination of the relative strain values by GBS mechanism in Armco iron within a range of 1.2-5.9%.

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Mechanisms of Plastic Deformation during Laser Heat Treatment of ARMCO Pure Iron

Cited by 3 publications

References 16 publications

Experimental methods for assessing the propensity of welded joints to local fault

Experimental methods for assessing the propensity of welded joints to local fault

Micromechanics of small deformations in metal alloys under laser irradiation

Micromechanics of small deformations in metal alloys under laser irra diation

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Mechanisms of Plastic Deformation during Laser Heat Treatment of ARMCO Pure Iron

Cited by 3 publications

References 16 publications

Experimental methods for assessing the propensity of welded joints to local fault

Experimental methods for assessing the propensity of welded joints to local fault

Micromechanics of small deformations in metal alloys under laser irradiation

Micromechanics of small deformations in metal alloys under laser irra­ diation

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Micromechanics of small deformations in metal alloys under laser irra diation