Influence of inclusion characteristics on the formability and toughness properties of a hot-rolled deep-drawing quality steel

Journal Article · Sat Feb 01 04:00:00 EST 1997 · Journal of Materials Engineering and Performance

DOI:https://doi.org/10.1007/s11665-997-0028-x· OSTI ID:455204

Paul, S K; Ray, A ^[1]

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1. Steel Authority of India Ltd., Ranchi (India)

In industrial practice, variations in the steelmaking process may cause significant change in inclusion characteristics. During hot rolling of flat steel products, manganese sulfides, which are plastic at elevated temperatures, are elongated in the rolling direction. These elongated inclusions affect the formability properties, such as ductility, strain hardening exponent, average plastic strain ratio, critical strain represented by the forming limit diagram, and Charpy V-notch (CVN) impact energy as well as fracture behavior. The inclusion characteristics and microstructural features of three commercially produced hot-rolled deep-drawing quality steels were evaluated and their effects on formability and impact properties were investigated. All three heats were made in a basic oxygen furnace. Two heats were teemed into ingots while the other heat was argon purged and continuous cast. These heats were then processed into 3.10 mm thick strips with identical processing parameters. Manganese sulfide stringers were found to reduce the transverse ductility, whereas yield and tensile strengths remained virtually the same in all directions. The formability parameters were not significantly affected by small variations in inclusion characteristics. However, CVN impact energy and impact transition temperature data were observed to improve with steel cleanliness. The sulfide stringers were also found to adversely affect the impact energy, transition temperature, and fracture behavior in the transverse direction.

• Sponsoring Organization: USDOE
• OSTI ID: 455204
• Journal Information: Journal of Materials Engineering and Performance, Journal Name: Journal of Materials Engineering and Performance Journal Issue: 1 Vol. 6; ISSN 1059-9495; ISSN JMEPEG
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CHARPY TEST
DUCTILITY
EXPERIMENTAL DATA
IMPACT STRENGTH
INCLUSIONS
MATERIALS WORKING
MECHANICAL PROPERTIES
ROLLING
STEELS
STRAIN HARDENING
TENSILE PROPERTIES
YIELD STRENGTH