Hot Ductility and Deformation Behavior of C-Mn/Nb-Microalloyed Steel Related to Cracking During Continuous Casting

Lanjewar, Harishchandra; Tripathi, P.; Singhai, Mrigandra; Patra, P.K.

doi:10.1007/s11665-014-1151-0

Cited by 9 publications

(7 citation statements)

References 18 publications

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“…The UTS results were higher for the lower temperatures and the opposite was registered for the maximal elongation; higher for higher temperatures. This result was as expected [15,[23][24][25].…”

Section: Methodssupporting

confidence: 90%

Holding Time Influence on the Hot Ductility Behavior of a Continuously Cast Low Alloy Steel

Gontijo

Hoflehner

Ilie

et al. 2020

Metals

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Cracking during the continuous casting process is undesirable and continuous work is being carried out to find further improvements and understand the mechanisms that lead to failure. Investigations on the hot ductility behavior of a continuously cast low alloyed steel using different holding times before straining were done in the present work. Samples were heated to melting temperature in a vacuum atmosphere and then cooled to one of the three test temperatures chosen: 750, 850, and 900 °C. When the desired temperature was reached, the sample was isothermally held for either 10, 90, 300, or 3600 s before the tensile test started, with a strain rate of 10−3 s−1. The reduction of area was measured, SEM images of the fractured surfaces were taken plus LOM images for the analysis of the microstructure. The results show that there was no significant change in the ductility at any of the temperatures until 300 s, with a change in behavior at 3600 s. This was further confirmed with the images and precipitation kinetics simulations. The results are described and compared.

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Section: Methodssupporting

confidence: 90%

Holding Time Influence on the Hot Ductility Behavior of a Continuously Cast Low Alloy Steel

Gontijo

Hoflehner

Ilie

et al. 2020

Metals

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“…When this type of AlN precipitates appears, a large stress would be formed on the grain boundary during the production process, which would result in cracking defects. [ 40,41 ] Therefore, the AlN precipitates on the grain boundary are harmful and have a high possibility of inducing crack initiation.…”

Section: Experimental and Model Resultsmentioning

confidence: 99%

“…When this type AlN precipitates appears, a large stress would be formed on the grain boundary during the production process, which would result in cracking defects. [40,41] Therefore, the AlN precipitates on AlN mainly precipitated on the grain boundary, and it was difficult to find AlN in the grain interior. According to thermodynamic research, [22,42] three precipitation modes of AlN in steel have been reported: uniform precipitation, dislocation precipitation, and grain boundary precipitation.…”

Section: Characteristics Of the Aln Precipitatesmentioning

confidence: 99%

Effects of the Cooling Rate and Recovery Temperature on the Growth of AlN Precipitates in Gear Steel

Shen

Cheng

Hou

et al. 2022

steel research int.

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During the continuous casting and rolling process of gear steel, AlN precipitation often causes surface cracks on the cast slab. Rapid cooling of the slab surface is a new concept to inhibit AlN and improve the cracking resistance, but it requires further investigation for practical application. Here, the effects of the cooling rate and recovery temperature on AlN growth behavior in gear steel are investigated by designing five cooling conditions. A mathematical model to describe the growth characteristics is constructed based on Ostwald ripening theory. The experimental results show that the cooling rate significantly influences the size and quantity of AlN. When the cooling rate increases from 3.0 to 5.0 °C s−1, the average diameter of AlN decreases from 133.6 to 75.8 nm and the number density of AlN decreases from 6.8 × 105 to 2.1 × 105 cm−2. The calculated results show that AlN has maximum size, which significantly decreases with decreasing temperature. When AlN reaches the maximum size, it stops growing. AlN growth during the cooling process mainly occurs above 800 °C. Therefore, a high cooling rate and a recovery temperature lower than 800 °C are key to inhibiting AlN precipitation and improving the cracking resistance.

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“…In region 1, ductility does not depend The reasons for this phenomenon are due to a number of mechanisms, the implementation of which depends on the temperature interval. The authors of [55][56][57] distinguished three regions of ductility troughs in steels. Region 1 is at high temperatures, typically 20-50 • C below the mean solidus temperature [56].…”

Section: Main Mechanisms Of Ductility Decrease At a High Temperaturementioning

confidence: 99%

“…The authors of reviews [45,56,57] noted that ductility failure in the temperature range of 1000-1150 • C may be associated with a delay in dynamic recrystallization, especially in microalloyed steels. It is well known that microalloying elements, especially niobium, can delay recrystallization [5,61].…”

Section: Main Mechanisms Of Ductility Decrease At a High Temperaturementioning

confidence: 99%

Hot Ductility, Homogeneity of the Composition, Structure, and Properties of High-Strength Microalloyed Steels: A Critical Review

Зайцев

Arutyunyan

Koldaev

2023

Metals

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High-strength micro-alloyed steels are widely used in various branches of technology and industry due to the simultaneous combination of high indicators of strength, ductility, fatigue, corrosion resistance, and other service properties. This is achieved due to the reasonable choice of the optimal chemical composition and parameters of temperature deformation treatment of steel that provide a synergistic effect on the dispersed microstructure and characteristics of excess phase precipitates, which control the achievement of these difficult-to-combine properties of rolled products. Additionally, the improvement of the level and stability of these properties, as well as the prevention of the occurrence of defects, is largely determined by the indicators of the homogeneity of the composition, structure by volume and manufacturability of the metal, and primarily hot ductility, which are controlled by the presence of precipitation of excess phases, including micro-alloying elements. In accordance with the circumstances noted, in the present review, a generalization, systematization, and analysis of the results of the studies are conducted on the effect of phase precipitates on the hot ductility and homogeneity of composition and structure, depending on the chemical composition and parameters of the temperature-deformation treatment of steel.

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Hot Ductility and Deformation Behavior of C-Mn/Nb-Microalloyed Steel Related to Cracking During Continuous Casting

Cited by 9 publications

References 18 publications

Holding Time Influence on the Hot Ductility Behavior of a Continuously Cast Low Alloy Steel

Holding Time Influence on the Hot Ductility Behavior of a Continuously Cast Low Alloy Steel

Effects of the Cooling Rate and Recovery Temperature on the Growth of AlN Precipitates in Gear Steel

Hot Ductility, Homogeneity of the Composition, Structure, and Properties of High-Strength Microalloyed Steels: A Critical Review

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