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Effect of Interdendritic Impurity Segregation on Hot Ductility Behavior of Low‐Carbon Steels
Author(s) -
Jeong Ji-Yeon,
Kim Byung-Tae,
Kwon Sang-Hum,
Kang Myeong-Hun,
Kim Dong-Gyu,
Heo Yoon-Uk,
Lee Jae-Sang,
Yim Chang-Hee
Publication year - 2020
Publication title -
steel research international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.603
H-Index - 49
eISSN - 1869-344X
pISSN - 1611-3683
DOI - 10.1002/srin.202000046
Subject(s) - materials science , ductility (earth science) , impurity , metallurgy , ultimate tensile strength , tensile testing , carbon fibers , hot rolled , carbon steel , composite material , corrosion , creep , chemistry , organic chemistry , composite number
Comparison of re‐heating tensile test (RHT) and re‐melting tensile test (RMT) reveals the effect of interdendritic impurity segregation on hot ductility in low‐carbon steels. Two low‐carbon steels with different amounts [wt%] of impurity elements (Steel A: P = 0.005, S = 0.001; Steel B: P = 0.01, S = 0.004) are tensile‐tested at temperatures 600–1000 °C after re‐heating to 1350 °C and re‐melting at 1570 °C. Steel A shows similar hot ductility behavior in the RHT and RMT, whereas the high‐impurity steel shows a significant decrease in hot ductility at 900 °C in the RMT compared with the RHT. Crack initiation at the interdendritic segregation region is suggested as an origin of the degradation of hot ductility in the high‐impurity steel. The effect of interdendritic impurity segregation on the hot ductility behavior of continuously cast steel is further discussed.