Changes in the microstructure of selected structural alloy steel grades identified after their simulated exposure to fire temperature

Pańcikiewicz, Krzysztof; Maślak, Mariusz; Pazdanowski, Michał; Stankiewicz, Marek; Zajdel, Paulina

doi:10.1016/j.cscm.2023.e01923

Cited by 6 publications

(18 citation statements)

References 26 publications

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“…In particular, it is not so much about the a posteriori observation of the complete lack of susceptibility to initiate brittle cracks in the tested material, but about the observed post-fire loss of the capability to effectively arrest the unrestrained growth of such cracks. This paper constitutes a continuation of previous works published earlier in [6][7][8].…”

Section: Introductionsupporting

confidence: 55%

“…The material used for the tests underwent normalization. Detailed metallographic examination showed that the structure of this steel contained elongated inclusions of manganese sulfides [8].…”

Section: Results Obtained On Samples Made Of S355j2+n Steelmentioning

confidence: 98%

“…Detailed results pertaining to the identification and qualitative interpretation of permanent changes observed by the authors of this paper in the microstructure of considered steel grades after action of simulated fire episodes following various development scenarios have been published and discussed in paper [8]. Therefore, these results will be called upon in the following deliberations only in the scope required for proper commenting of the results referring to the same steels, but obtained during the research of their post-fire impact strength, reported below.…”

Section: Microstructural Studies Of Impact Fracturesmentioning

confidence: 99%

“…Due to the limitations listed above the chemical composition of the samples tested in the experiment described here was determined independently, in a manner alternative to the classical EDS, and in our opinion yielding more reliable results. The optical emission spectrometer (OES) was applied for this purpose [8].…”

Section: Microstructural Studies Of Impact Fracturesmentioning

confidence: 99%

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Impact Fracture Surfaces as the Indicators of Structural Steel Post-Fire Susceptibility to Brittle Cracking

et al. 2023

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The results of experimental research on forecasting post-fire resistance to brittle failure of selected steel grades used in construction are presented and discussed in this paper. The conclusions are based on detailed analysis of fracture surfaces obtained in instrumented Charpy tests. It has been shown that the relationships formulated based on these tests agree well with conclusions drawn based on precise analysis of appropriate F–s curves. Furthermore, other relationships between lateral expansion LE and energy Wt required to break the sample constitute an additional verification in both qualitative and quantitative terms. These relationships are accompanied here by values of the SFA(n) parameter, which are different, depending on the character of the fracture. Steel grades differing in microstructure have been selected for the detailed analysis, including: S355J2+N—representative for materials of ferritic-pearlitic structure, and also stainless steels such as X20Cr13—of martensitic structure, X6CrNiTi18-10—of austenitic structure and X2CrNiMoN22-5-3 duplex steel—of austenitic-ferritic structure.

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Section: Introductionsupporting

confidence: 55%

Section: Results Obtained On Samples Made Of S355j2+n Steelmentioning

confidence: 98%

Section: Microstructural Studies Of Impact Fracturesmentioning

confidence: 99%

Section: Microstructural Studies Of Impact Fracturesmentioning

confidence: 99%

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Impact Fracture Surfaces as the Indicators of Structural Steel Post-Fire Susceptibility to Brittle Cracking

et al. 2023

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“…a great deal of research has been conducted by domestic and foreign scholars on the microstructural distribution of engineering steels [8]. in terms of the relationships between high-temperature service environments and material microstructure [9][10][11][12][13][14][15], Zeng et al studied the variation of microstructure in post-fire 4 mm-thick Q890 steel and found that the fire temperature affects the phase size and the constituent phases in the investigated material [13]. Wang et al investigated the influence of TMcp process on the microstructure and properties of 20 mm-thick Q460q steel, and found that both the volume fraction and grain size of ferrite are inversely proportional to the rolling temperature [14].…”

Section: Introductionmentioning

confidence: 99%

The Influence of Short-Term High Temperature Environment on the Non-Uniform Distribution of Ferrite Grain Size in 40 mm-thick Q345 Steel

Xu,

Gou,

et al. 2024

Archives of Metallurgy and Materials

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In order to reveal the non-uniform distribution of grain size in thick direction for engineering heavy plate, microstructure of 40 mm-thick Q345 steel was observed and measured under different short-term high temperature environments formed by fire. Moreover, the influence of the short-term high temperature environment was revealed on the distribution of ferrite grain size in the Q345 steel. Under different fire service environments, there was a log-normal distribution relationship between the distribution parameter Nf (number of ferrite grains) and df (average grain diameter), as well as ρAf (area fraction density) and df, at different positions along the thickness direction. However, the statistical results are greatly affected by the length of the statistical interval. When df is about 4 to 6 times the length of the statistical interval, the statistical accuracy is higher. By using nonlinear fitting method, multiple non-uniform distribution empirical models including Nf-df empirical formulas and ρAf-df empirical formulas were established at different positions along thick direction under various fire environments. Furthermore, the interrelationships between fire temperature T and Nf , T and ρAf , fire duration t and Nf , t and ρAf were revealed, respectively.

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Testing of Post‐fire Brittleness for Certain Standard Duplex and Lean Duplex Stainless Steel Grades

Maslak,

Pazdanowski,

Stankiewicz

et al. 2023

ce papers

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The results of post‐fire brittle cracking susceptibility tests conducted on samples made of selected duplex type stainless steel grades exhibiting austenitic‐ferritic structure, in particular on standard duplex X2CrNiMoN22‐5‐3 steel and on lean duplex X2CrMnNiN21‐5‐1 steel, are presented and widely discussed. General conclusions are based on the force‐displacement graphs obtained by the instrumented Charpy impact test. Prior to the test all samples have been subjected to simulated fire action following the steady‐state heating regime and then cooled down to room temperature. Two heating levels have been considered, namely 600°C and 800°C. The first of these levels has been considered as to low, while the second as sufficiently high, to induce in the considered steel structural changes of permanent character. For comparison, two groups of samples have been tested. Samples belonging to the first group have been heated for one hour (simulation of a short fire), while the ones belonging to the second group have been heated for ten hours (simulation of a long fire). In addition, two alternative cooling modes have been considered, i.e. slow cooling in the muffle furnace and rapid cooling in water mist. The toughness tests on samples made of both steel grades have been conducted at two different temperature values, that is at +20°C to simulate the continued service in summer conditions and at ‐20°C to simulate this future service in winter conditions.

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Changes in the microstructure of selected structural alloy steel grades identified after their simulated exposure to fire temperature

Cited by 6 publications

References 26 publications

Impact Fracture Surfaces as the Indicators of Structural Steel Post-Fire Susceptibility to Brittle Cracking

Impact Fracture Surfaces as the Indicators of Structural Steel Post-Fire Susceptibility to Brittle Cracking

The Influence of Short-Term High Temperature Environment on the Non-Uniform Distribution of Ferrite Grain Size in 40 mm-thick Q345 Steel

Testing of Post‐fire Brittleness for Certain Standard Duplex and Lean Duplex Stainless Steel Grades

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