Mechanism of hot ductility loss in C–Mn steels based on nonequilibrium grain boundary segregation of impurities

Zheng, Zongwen; Yu, Hongying; Liu, Zhenjun; Xu, Tao; Misra, R.D.K.

doi:10.1557/jmr.2015.93

Cited by 4 publications

(5 citation statements)

References 39 publications

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“…Another explanation for the changes in the results for the RA was given by Kang et al [14] and Zheng et al [17], which correlate it to the segregation of S at austenite grain boundaries. The more sulfur, the worse the ductility will be.…”

Section: Methodsmentioning

confidence: 92%

“…Increasing the holding time at a determined temperature prior to the tensile test has resulted previously in different conclusions [13][14][15][16][17][18]. In Figure 4, it was seen that until 300 s of holding time there was no significant change in the ductility curve of the material tested.…”

Section: Methodsmentioning

confidence: 98%

“…One of the reasons for the changes seen in previous studies with different holding times was the presence of a greater amount of certain alloying elements, such as Nb, V or Ti, that form other precipitates detrimental to ductility [13,15,17,22].…”

Section: Methodsmentioning

confidence: 99%

“…This is because of the formation of more MnS, decreasing the concentration of S at grain boundaries. Zheng et al [17] concluded that if the holding time is longer than the critical time of maximum grain boundary segregation, the hot ductility can be improved. The critical time depends on the temperature, but for temperatures lower than 950 • C, it was observed to be longer than 300 s for C-Mn steels, and little change was reported for holding times lower than 300 s.…”

Section: Methodsmentioning

confidence: 99%

“…Zheng et al [17] carried out different analyses for the hot ductility of C-Mn steels, also testing various holding times at the tensile test temperature of 950 • C and strain rate of 22 s −1 . The reduction of area measured for each condition showed that there was no significant difference for low holding times (lower than 500 s).…”

Section: Introductionmentioning

confidence: 99%

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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: Methodsmentioning

confidence: 92%