Impact Strength of Low-Carbon Steel 09G2S Welded Joint Metal

Nikulin, S.; Rogachev, S. O.; Белов, В. А.; Комиссаров, А. А.; Turilina, V. Yu.; Shplis, N. V.; Nikolaev, Yu. A.

doi:10.1007/s11015-022-01286-2

Cited by 2 publications

(4 citation statements)

References 6 publications

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“…Thus, the base metal and the weld metal after high-temperature exposure had a comparable static yield strength and endurance limit, which is explained by their similar structure. At the same time, the previously obtained values of the impact toughness of the base metal and weld metal did not correlate with their structure [13], and this issue requires further in-depth study.…”

Section: Discussionmentioning

confidence: 78%

“…Quenching and subsequent tempering led to the formation of quasi-polygonal ferrite that was practically free from carbide precipitates as well as fine-grained decomposition products of lower bainite with a higher content of fine cementite, which is typical for low-carbon steels [29]. The size of the former austenite grain in the base metal and in the weld metal as delivered did not differ significantly and amounted to 27 and 32 µm, respectively [13]. Overheating with slow cooling in the furnace formed a normalized ferrite-pearlite structure with a much larger grain (Figure 2b,d), where the pearlite was located mainly along the boundaries and in triple junctions of ferrite grains.…”

Section: Microstructurementioning

confidence: 99%

“…The relative effect of overheating on the reduction in the yield strength of the base metal and the weld metal was comparable (about 20%). The room temperature impact toughness (KCV) was 355, 377, 144, and 143 J/cm 2 , respectively, for the materials in the following order: base metal, base metal after overheating, weld metal, and weld metal after overheating [13]. The microhardness profiles across the welded joint are shown in Figure 7.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

“…To calculate the minimum required margin of safety for a metal construction in emergency conditions, it is important to know the effects of extreme temperatures and force conditions on the mechanical properties of the material. Such data are available in the literature, but they mainly concern the static strength and impact strength [12,13]. At the same time, the most important property of a structural material is its fatigue strength.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Overheating on High-Cycle Fatigue Characteristics of the Base Metal and Weld Metal of Low-Carbon Steel Welded Joints

Nikulin,

Rogachev,

Prosvirnin

et al. 2023

Metals

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The results of a high-cycle fatigue testing of our samples were obtained, and a comparative assessment of the properties of the base metal and weld metal of 09G2S-type steel (13Mn6 according to the DIN17145-80 standard) before and after overheating (1200 °C, 3.7 h) was performed. The welded joints between the sheets of 09G2S steel were obtained through automatic argon arc welding. The fatigue tests were carried out under repeated tensile loading. The “maximum cycle stress—number of cycles to failure” fatigue curves of the samples were plotted. The fracture surfaces of the samples were studied, and the fatigue failure mechanisms were analyzed. It was shown that, during testing, all samples demonstrated cyclic hardening behavior. The samples of the base metal as delivered had the highest endurance limit, and the smallest endurance limit was found in the samples of the base metal and weld metal after overheating, the endurance limits of which were similar. The fracture mechanism of all samples was quasi-brittle with the presence of very thin fatigue micro-grooves. The final rupture of all samples had a ductile dimple type.

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Section: Discussionmentioning

confidence: 78%

Section: Microstructurementioning

confidence: 99%

Section: Mechanical Propertiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Influence of Overheating on High-Cycle Fatigue Characteristics of the Base Metal and Weld Metal of Low-Carbon Steel Welded Joints

Nikulin,

Rogachev,

Prosvirnin

et al. 2023

Metals

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Structure and properties of steels for manufacture of core catcher vessel of nuclear reactor

Nikulin

Рогачев

Белов

et al. 2023

Izv. vysš. učebn. zaved., Čern. metall.

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The Russian new nuclear reactors are provided with a special core catcher vessel device (cc-vessel) designed to minimize the consequences of a severe beyond design basis accident at a nuclear power plant, when the reactor pressure vessel collapses and the core melts. For manufacture of the cc-vessel structural elements, low-carbon unalloyed or low-alloyed steels are used. When a severe beyond design basis accident develops, the cc-vessel’s body is subjected to extreme temperature and force loads, which can lead to degradation of the structure, loss of strength and failure of the entire cc-vessel. To calculate the strength characteristics of the cc-vessel, which ensure its safe and reliable operation, the detailed data are required on the structure and mechanical properties of low-carbon steels at high temperatures and after extreme thermal actions simulating the development of a severe beyond design basis accident. The paper analyzes data on the structure and mechanical properties (tensile strength, crack resistance, toughness and cyclic strength) of a number of low-carbon steels under extreme temperature and force actions, including conditions simulating the development of a severe beyond design basis accident at a nuclear power plant, in order to select the material for the design of cc-vessel of nuclear reactor. New data on the structure, mechanical properties, and thermal diffusivity in a wide temperature range of a Cr – Mo steel (Russian Standard – 15KhM) as a candidate structural material for the manufacture of the cc-vessel body are presented. The low content of manganese and alloying with molybdenum and vanadium in 15KhM steel provides a finer grained structure and eliminates the steel’s tendency to temper brittleness.

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Impact Strength of Low-Carbon Steel 09G2S Welded Joint Metal

Cited by 2 publications

References 6 publications

Influence of Overheating on High-Cycle Fatigue Characteristics of the Base Metal and Weld Metal of Low-Carbon Steel Welded Joints

Influence of Overheating on High-Cycle Fatigue Characteristics of the Base Metal and Weld Metal of Low-Carbon Steel Welded Joints

Structure and properties of steels for manufacture of core catcher vessel of nuclear reactor

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