Metallurgy – Steelmaking & Casting: Impact of Inclusion on Mechanical Properties
Thursday, 29 October 2020 • 9–10:30 a.m. EDT
New Experimental Apparatus to Investigate Hot Tearing Behavior in Steel
Yanru Lu, Missouri University of Science and Technology
Hot tearing is a complex thermomechanical phenomenon occurring in the semi-solid region. Strain in this region can induce cracking and localized alloying element segregation. An apparatus for investigating hot tearing was developed utilizing a servo motor-controlled cylinder to apply a pre-determined amount of strain to the solidifying shell. A special mold was developed using filling and solidification modeling to ensure that dendrite growth was perpendicular to applied strain. A computer-automated system was utilized to control the strain and strain rate and measure the force and displacement. Solidification experiments utilizing AISI 1020 steel validated the apparatus capabilities and optimized testing parameters.
The Influence of Ti, Nb and V on the Hot Ductility of As-Cast Microalloyed Steels
Madhuri Varadarajan, Missouri University of Science and Technology
Microalloying with Ti, Nb and V, both individually and in combination, is a common method for producing steels with high strength and toughness. However, interaction with other elements and impurities can lead to cracking during continuous casting and rolling. The hot ductility of commercially cast V, Nb and Nb-V-Ti steels has been investigated using two experimental methods: tensile testing utilizing a servo-hydraulic load frame with a resistance furnace and thermomechanical testing using rapid joule heating. The temperature-dependent ductility of these steels is compared for both test methods. Factors that influence the ductility of these steels are discussed.
Judy Li, ArcelorMittal Indiana Harbor
AIST’s Metallurgy – Steelmaking and Casting Technology Committee