Analysis of The Causes the Degradation of Part Steam Generator by Using Microscopy Methods

Kuśmierczak, Sylvia; Majzner, Tomas

doi:10.21062/ujep/x.2016/a/1213-2489/mt/16/5/995

Cited by 4 publications

(2 citation statements)

References 6 publications

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“…After the material has been plastically transformed, changes in the microstructure should be observed in the samples, depending on the degree of plastic deformation in the layer. As described by Puškár [14,15], the influence of the plastic deformation on the structure can be observed with a microscope only when the volume changes in the material are at least 10%.…”

Section: Roll Bending Processmentioning

confidence: 99%

Analysis of 1.4571 Chrome-Nickel Steel Properties after Cold Forming by Bending

Stančeková

Michalková

Sapieta

et al. 2019

MSF

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The paper deals with the problems of austenitic chrome-nickel steels and their behavior in plastic deformation processes. These steels cannot be hardened by thermal processes due to a stable austenitic structure, therefore the increase of strength is achieved only by cold forming. The deformation mechanisms of the slip or twinning are activated by the effect of the forming force in the steel. Mainly, there is formed deformation-induced martensite whose structure is different from the martensite created by the heat treatment. As the intensive hardening of austenitic chrome-nickel steels under the effect of plastic deformation is beneficial, it adversely affects the machining of these materials.

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Section: Roll Bending Processmentioning

confidence: 99%

Analysis of 1.4571 Chrome-Nickel Steel Properties after Cold Forming by Bending

Stančeková

Michalková

Sapieta

et al. 2019

MSF

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“…The detector receives and processes the electrons so as to obtain a sharp image of the sample surface. Rather than a traditional optical microscope its advantage is a large depth of focus and the ability to get more magnification [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Using of electron microscopy for tool wear evaluation

Náprstková¹,

Cais²,

Kraus³

et al. 2017

Engineering for Rural Development

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Abstract. Using of cutting inserts is currently a normal part of the manufacturing process. The article deals with the tool wear evaluation of selected inserts for turning by electron microscopy. Use of electron microscopy helps closer analysis of machining consequences for these plates, because the microscope images captured with the electron microscope have a greater depth of sharpness and can display the examined object with greater plasticity. It is another way to explore objects and extends the possibilities for obtaining large quantities of information. Electron microscopy is possible to be used for getting better information about toolwear after machining, for example, too. One of the possible usages during the research is in the area of toollife of cutting inserts, which is realized at the Faculty of Production Technology and Management of Jan Evangelista Purkyně University in Ústí nad Labem. As part of this research various analyzes were also carried out. Part of such research was to analyze the resulting tool wear of the used inserts after turning of selected material also by electron microscopy, specifically the SEM analysis. The SEM analysis can show more and more what in the surveyed area might happen in comparison with conventional microscopy. Images are sharper and more stereoscopic and some aspects are more noticeable. That is why SEM was used as a complementary analysis method throughout this research. As an experimental material hardened steel class 16 343 according to the CSN 41 0002 has been used. The experimental material was turned on the three-axis CNC lathe DOOSAN Lynx 220L with the control system FANUC.Keywords: tool wear, electron microscopy, tool life. IntroductionAt the Faculty of Production Technology and Management, which is part of the Jan Evangelista Purkyně University in Ústí nad Labem several research projects are carried out. One of them is research in the area of tool life of cutting inserts, because using of cutting inserts is currently a common part of the manufacturing process and it is very interesting for production companies. As part of this research various analyzes were also carried out. One of these was analysis of tool life of experimental inserts by the SEM analysis, which is available at FPTM JEPU [1][2][3].The SEM analysis was used to supplement the final examination of the insert tool wear after machining.The abbreviation SEM means a scanning electron microscope. This microscope is working with a narrow electron beam. To formation of images primary and secondary electrons are used backscattered from the sample surface. These electrons are formed by the interaction of atoms of the sample with electrons of the electron beam. The detector receives and processes the electrons so as to obtain a sharp image of the sample surface. Rather than a traditional optical microscope its advantage is a large depth of focus and the ability to get more magnification [4][5][6].The SEM analysis can show more and more what in the surveyed area might happen, in comparison with convent...

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Application Possibilities of Low-temperature Repairs by Welding for Creep-resistance Material GX12CrMoVNb9-1

Moravec¹,

Nováková²,

Sobotka³

2018

Manufacturing Technology

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Paper is focused on the area of the energy devices working under the higher temperatures and pressures. It deals with repair of new and operational-loaded components of steam and gas turbines (valve and turbine chamber, transmitters, vane carriers, flap-lockable valve bodies and so on). Generally, there occur different types of defects at production and operating of these parts. Many defects are caused by casting (shrinkage cavities, pores, cracks) and fatigue defects. Eventually, there can occur also production defects. Moreover, most of the defects in the mentioned parts generally take effect not until during the subsequent technological operations. However, in such phase of production, only welding technology can be used to repair the given part. That´s why as a goal of this paper there was to find such repair welding procedures which ensure the serviceability of mentioned devices in the standard mode indeed at application of the lower tempering temperatures in comparison to the commonly requirements for material GX12CrMoVNb9-1. Lower tempering temperatures have a strong influence on elimination the deformation as well as on the surface oxidation of the machined components.

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Analysis of The Causes the Degradation of Part Steam Generator by Using Microscopy Methods

Cited by 4 publications

References 6 publications

Analysis of 1.4571 Chrome-Nickel Steel Properties after Cold Forming by Bending

Analysis of 1.4571 Chrome-Nickel Steel Properties after Cold Forming by Bending

Using of electron microscopy for tool wear evaluation

Application Possibilities of Low-temperature Repairs by Welding for Creep-resistance Material GX12CrMoVNb9-1

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