Influence of long-term ageing on the microstructure and mechanical properties of T24 steel

Zieliński, A.; Golański, G.; Sroka, M.

doi:10.1016/j.msea.2016.11.087

Cited by 42 publications

(32 citation statements)

References 46 publications

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“…It shows high creep strength (R Z/100000/700 = 85 MPa). The HR6W alloy creep strength is summarised in Table 2. In the assessment of the life time of steels and alloys working under creep conditions, the main source of information is still creep tests in spite of the fact that their disadvantage is significant time to obtain test results [5][6][7][8][9][10]. To reduce the duration of testing and assessment of the life time, the so-called abridged creep tests with duration from a few dozen to max 10 to 15 thousand hours are used in practice [11].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Creep Strength of Heterogeneous Welded Joint in HR6W Alloy and Sanicro 25 Steel

Zieliński¹,

Dobrzański²,

Purzyńska³

et al. 2017

Archives of Metallurgy and Materials

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This article presents the results of investigations on HR6W alloy and Sanicro 25 steel and the dissimilar welded joint made of them. The characteristic images of microstructure of the investigated materials in the as-received condition and following the creep test, observed with a scanning electron microscope (SEM), are shown. The X-ray analysis of phase composition of the existing precipitates was carried out. The method for evaluation of creep strength based on abridged creep tests carried out at a temperature higher than the design one is presented. The obtained results do not deviate from the values of creep strength determined in longterm creep tests. The maximum difference in creep strength of the investigated materials is ±20%, which is in compliance with the acceptable scatter band. The methodology presented can be used for verification of creep strength (life time) of the material of finished components to be operated under creep conditions.

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Section: Introductionmentioning

confidence: 99%

Evaluation of Creep Strength of Heterogeneous Welded Joint in HR6W Alloy and Sanicro 25 Steel

Zieliński¹,

Dobrzański²,

Purzyńska³

et al. 2017

Archives of Metallurgy and Materials

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“…EDS results of analysed intermetallic compounds revealed a high concentration of Al, Sr and Mg though Mg may come from the matrix. The observed intermetallic compounds have most probably resulted from the grain refinements addition in the form of Mg 17 Sr 2 , Mg 2 Sr or Al 4 Sr phase as suggested in [23][24][25], however, it must be noted that melting temperatures of proposed phases are 606°C, 680°C and 1040°C, respectively. Moreover, according to the Mg-Sr binary system [22] and suggestions in [23], the Mg 2 Sr phase is observed Mg alloys with a higher concentration of Sr (more than 1.5%).…”

Section: Resultsmentioning

confidence: 87%

“…Magnesium alloys have newly been adopted to make portable electric devices because these alloys are light, exhibit high electrical and thermal conductivities, and can be recycled [3]. They have also been used in automotive and aerospace applications due to their attractive attributes containing low density, high specific strength and a superior stiffness-to-weight ratio comparing to the other construction materials [4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Thermal Assessment of Modified Ultra-Light Magnesium-Lithium Alloys

Król

Mikuszewski

Kuc

et al. 2017

Archives of Metallurgy and Materials

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The paper presents the results of the influence of commercial TiBor and AlSr10 master alloys on the refine the grains size, hardness and crystallisation process based on the thermal-derivation analysis of light cast magnesium-lithium-aluminium alloys. The effects of TiBor and AlSr10 content on the characteristic parameters of the crystallisation process of Mg-Li-Al alloys were investigated by thermal-derivative analysis (TDA). Microstructural evaluations were identified by light microscope, X-ray diffraction, scanning electron microscopy, and energy dispersive X-ray spectroscopy.The results showed that the addition of TiBor master alloy reduced the grain size of Mg-9Li-1.5Al cast alloy from 900 μm to 500 μm, while the addition of AlSr10 master alloy reduced the grain size of investigated cast alloy from 900 μm to 480 μm. Moreover, an addition of TiBor and AlSr10 simultaneously reduced the grain size from 900 μm to 430 μm.Results from the thermal-derivative analysis showed that the addition of grain refinement causes a decrease in nucleation temperature and solidus temperature.

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“…As part of the diagnostics, not only the basic material of the operated component but also the material of welded joints is subject to evaluation [15]. It is necessary to evaluate the condition of the material of welded joints to determine the component's ability to carry the required operating loads during its further service.…”

Section: Materials For Investigationsmentioning

confidence: 99%

Assessment of the Residual Life of Steam Pipeline Material beyond the Computational Working Time

Sroka

Zieliński

Dziuba-Kałuża

et al. 2017

Metals

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This paper presents the evaluation of durability for the material of repair welded joints made from (13HMF) 14MoV6-3 steel after long-term service, and from material in the as-received condition and after long-term service. Microstructure examinations using a scanning electron microscope, hardness measurements and creep tests of the basic material and welded joints of these steels were carried out. These tests enabled the time of further safe service of the examined repair welded joints to be determined in relation to the residual life of the materials. The evaluation of residual life and disposable life, and thus the estimation and determination of the time of safe service, is of great importance for the operation of components beyond the design service life. The obtained test results are part of the materials' characteristics developed by the Institute for Ferrous Metallurgy for steels and welded joints made from these steels to work under creep conditions.

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Influence of long-term ageing on the microstructure and mechanical properties of T24 steel

Cited by 42 publications

References 46 publications

Evaluation of Creep Strength of Heterogeneous Welded Joint in HR6W Alloy and Sanicro 25 Steel

Evaluation of Creep Strength of Heterogeneous Welded Joint in HR6W Alloy and Sanicro 25 Steel

Thermal Assessment of Modified Ultra-Light Magnesium-Lithium Alloys

Assessment of the Residual Life of Steam Pipeline Material beyond the Computational Working Time

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