Evolution of Austenite Grain Structure and Microalloying Element Precipitation During Heating of Steel of Strength Class K65 (X80) for Rolling

Ringinen, D. A.; Chastukhin, A. V.; Khadeev, G. E.; Éfron, L. I.; Il’inskii, V. I.

doi:10.1007/s11015-014-9835-0

Cited by 11 publications

(9 citation statements)

References 2 publications

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“…Thus, a study of specimens in a TEM entirely agrees with results of previous studies in a scanning electron microscope [7]: temperature and soaking time in a furnace determine the morphology and distribution of microalloying element particles within the volume of metal.…”

supporting

confidence: 87%

“…This phenomenon is known as secondary recrystallization (SR) [8,9]. Retention of austenite inhomogeneity, even after repeated hot deformation, has also been demonstrated in [7]. Finally, this inhomogeneity leads to a reduction is stability and overall level of ductile properties within sheet.…”

mentioning

confidence: 99%

“…As has been established in [7], in choosing heating temperature and slab soaking duration in a furnace it is extremely important to consider the possibility of developing abnormal growth of individual grains within metal, leading to formation of a varying grain size structure before the start of rough rolling. This phenomenon is known as secondary recrystallization (SR) [8,9].…”

mentioning

confidence: 99%

“…This makes it possible to suggest an effect of steel chemical composition on the temperature for the start of abnormal grain growth, particularly the content of carbon, nitrogen and microalloying elements (MAE). This effect is expressed as a change in temperature for niobium carbonitride dissolution, determining the temperature for the start of SR [7,10]. In this case, the start of abnormal grain growth may differ considerably for steels of different chemical composition.…”

mentioning

confidence: 99%

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Formation of Austenitic Structure During Heating Slabs of Pipe Steels Microalloyed with Niobium*

Chastukhin¹,

Ringinen²,

Khadeev³

et al. 2015

Metallurgist

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The effect of heating temperature and holding duration for slabs in a furnace soaking zone on the structure of microalloyed steel austenite with a different strength category is studied. It is revealed that after heating and soaking in all cases there is possible formation of one of three types of austenitic structure: fi negrained, varying grain size, and coarse-grained. The reason for forming different types of structure is irregular growth of individual grains as a result of dissolution of fi ne niobium carbonitride particles. It is shown that the start of irregular grain growth depends on steel heating temperature, soaking time, and chemical composition. An effective method is proposed for calculating slab heating temperature and time in a furnace soaking zone providing maximum dissolution of niobium carbonitride inclusions without forming an inhomogeneous structure before the start of the rough rolling stage.Each controlled rolling (CR) production stage fulfi ls and specifi c role in metal structure formation, and thus affects fi nal product structure-sensitive properties. For microalloyed high-strength pipe steels slab heating is an important CR stage, since it determines to a signifi cant extent solid solution composition and austenitic structure uniformity, on which depend such rolled product properties as low-temperature impact strength, and proportion of ductile component in a fracture [1][2][3].The slab heating regime for rolling on one hand is determined by equipment production limitations [4][5][6], and on the other by a requirement for providing a desired austenite condition before hot rolling. As has been established in [7], in choosing heating temperature and slab soaking duration in a furnace it is extremely important to consider the possibility of developing abnormal growth of individual grains within metal, leading to formation of a varying grain size structure before the start of rough rolling. This phenomenon is known as secondary recrystallization (SR) [8,9]. Retention of austenite inhomogeneity, even after repeated hot deformation, has also been demonstrated in [7]. Finally, this inhomogeneity leads to a reduction is stability and overall level of ductile properties within sheet. Subsequent analysis of carbonitride phase particles in test specimens using a scanning electron microscope has made it possible to reveal the reason for abnormal growth of individual austenite grains, i.e., delay of normal growth by fi ne particles of niobium carbonitride distributed within the structure. Dissolution of inclusions leads to a reduction in the force delaying boundary migration, and rapid individual grain growth. This makes it possible to suggest an effect of steel chemical composition on the temperature for the start of abnormal grain growth, particularly the content of carbon, nitrogen and microalloying elements (MAE). This effect is expressed as a change in temperature

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confidence: 87%

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confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Formation of Austenitic Structure During Heating Slabs of Pipe Steels Microalloyed with Niobium*

Chastukhin¹,

Ringinen²,

Khadeev³

et al. 2015

Metallurgist

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“…[17][18][19] Additionally, the finely dispersed carbon-nitride particles of Ti and Nb can effectively inhibit the growth of austenite grains in the coarse-grained heat-affected zone during the subsequent cooling process. [20,21] During austenite cooling process in the coarse grain region, bainitic ferrite nucleates and grows at austenite grain boundaries. Carbon atoms in the bainite ferrite diffuse into the austenite, making the carbon rich austenite more stable and forming M/A components at lower temperatures.…”

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confidence: 99%

Effect of Microstructure on Mechanical Properties of X65MS Welded Pipe Joint

Zhang,

Wei,

Wang

et al. 2024

steel research int.

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The mechanical properties of welded joints have a crucial impact on the safety of pipelines. This article focuses on examining the correlation between the microstructure and mechanical properties of welded joints of X65MS pipeline steel for sour service. The results indicate that the welding thermal cycle forms the microstructure consisting of acicular ferrite, granular bainite, and polygonal ferrite. The hardness across the joint ranges from 210 and 270 HV, peaking within the welded zone and decreasing towards the base metal (BM). At −40 °C, the welded zone shows the lowest impact energy of 53 J, while heat‐affected zones exhibit superior impact toughness exceeding 270 J with the highest impact energy of 326 J. This can be attributed to the exceptionally fine‐grained microstructure, a small quantity of small‐sized martensite‐austenite (M/A) constituents in the heat affected zone. As for the low toughness of the weld, the main factors can be attributed to the presence of large‐sized elongated M/A constituents and inclusions.

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Development of Technological Methods of Additional Grain Refinement for Production of Cold Resistant Nb-Bearing Plate Steel with SMYS 450-485 MPA and Thickness Up to 40 MM

Matrosov¹,

Golovin²,

Ringinen³

et al. 2015

HSLA Steels 2015, Microalloying 2015 &Amp; Offshore Engineering Steels 2015

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Evolution of Austenite Grain Structure and Microalloying Element Precipitation During Heating of Steel of Strength Class K65 (X80) for Rolling

Cited by 11 publications

References 2 publications

Formation of Austenitic Structure During Heating Slabs of Pipe Steels Microalloyed with Niobium*

Formation of Austenitic Structure During Heating Slabs of Pipe Steels Microalloyed with Niobium*

Effect of Microstructure on Mechanical Properties of X65MS Welded Pipe Joint

Development of Technological Methods of Additional Grain Refinement for Production of Cold Resistant Nb-Bearing Plate Steel with SMYS 450-485 MPA and Thickness Up to 40 MM

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