Effects of Non-metallic Inclusions on Hot Ductility of High Manganese TWIP Steels Containing Different Aluminum Contents
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TRODUCTION
TWIN-INDUCED plasticity (TWIP) steels containing high content of manganese are being developed for automotive industry. These steels provide a great potential in applications for structural components in the automotive industry due to their excellent tensile strength-ductility combination properties and high energy absorption capacity.[1,2] The tensile strength and elongation of TWIP steels are 600 to 1100 MPa and 60 to 95 pct, respectively.[3–5] Hot ductility has been extensively studied for low C-Mn and C-Mn microalloyed steels to avoid the problem of transverse cracking.[6–12] The hot ductility of stainless steels has been studied for the same reason.[13–17] Similarly, the hot ductility of the high manganese steels is an important factor that may affect
YU-NAN WANG and RUI-ZHI WANG, Researchers, and JIAN YANG, Professor, are with the Steelmaking Research Department, Research Institute, Baosteel Group Corporation, Shanghai 201900, P.R. China. Contact e-mail: [email protected] XIU-LING XIN, Master, and LONG-YUN XU, Doctoral Candidate, are with the School of Metallurgy and Environment, Central South University, Changsha, 410083, P.R. China. Manuscript submitted September 22, 2015. METALLURGICAL AND MATERIALS TRANSACTIONS B
the steel slab surface cracking in the continuous casting process and subsequent hot rolling stages.[2] Kang et al.[18–20] have investigated the hot ductility of various TWIP steels and the influence of different compositions on it. Mejı´ a et al.[21,22] have studied the effects of microalloying elements and the solidification route on the hot ductility of high manganese TWIP steels. The aluminum addition into high manganese TWIP steels can reduce the specific weight, increase the stacking fault energy (SFE), and suppress delayed fracture in press-formed parts effectively.[23–31] However, aluminum additions into steels have always created transverse cracking problems owing to the precipitation of AlN at the austenite grain boundaries, weakening the boundary region and giving rise to intergranular failure.[9,32] Nachtrab and Chou[6] have investigated the effect of aluminum on the hot ductility of a carbon-manganese steel. The hot ductility of P containing TRIP type steels with aluminum levels from 0.03 to 0.87 mass pct has been determined by Su et al.,[33] whereas the hot ductility of TRIP steels with aluminum levels from 0.01 to 1.98 mass pct has been examined by Mintz et al.[34] The effects of aluminum and AlN on the hot ductility of TWIP steels have also been investigated.[2,35,36] Hamada and Karjalainen[2] have investigated the effects of aluminum, carbon, manganese, and silicon on the hot ductility behavior of high manganese TWIP steels. Kang
et al.[35,36] have examined the hot ductility of TWIP steels with the contents of aluminum either less than 0.05 or 1.5 mass pct. However, the effects of characteristics of inclusions in high manganese TWIP steels on the hot ductility have not been investigated. This paper aims to investigate the effects of inclusions on the hot ductility of high
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