Late News Poster Session: Iron and Steel (Ferrous Alloys)
Program Organizers: MS&T Administration, MS&T PCC
Tuesday 4:45 PM
October 19, 2021
Room: Exhibit Hall B
Location: Greater Columbus Convention Center
P3-26: Introducing Heusler Fe2SiTi Intermetallic as a New Strengthening Precipitate for High Strength Low Alloy Steels: Rafael Rodriguez De Vecchis1; Xin Wang1; Soumya Sridar1; Zhangwei Wang2; Wei Xiong1; 1University of Pittsburgh; 2Max-Planck-Institut für Eisenforschung GmbH
High strength low alloy (HSLA) steels are candidate steels for automobile and naval applications due to an outstanding synergy of weldability, toughness, and strength resulting from the combination of low carbon content and co-precipitation of Cu and M2C. However, in the continuous search for stronger, lighter, and low-alloying steels, precipitation strengthening of Heusler compounds has proven promising but has been so far left unexplored in the context of HSLA steels. Hence, in this work, a composition close to the HSLA-100 steel was designed through a CALPHAD-based ICME (CALPHAD: Calculation of Phase Diagrams, ICME: Integrated Computational Materials Engineering) framework with Fe2SiTi Heusler intermetallic for precipitation strengthening effects. The phase stability and precipitation kinetics were systematically studied via phase transformation modeling and experiments. The latter report a 717 HV peak aging hardness as the result of record-high ~8 vol.% of nano-sized Fe2SiTi precipitate formed concomitantly with Cu clusters.
Poster
P3-27: Understanding the Load Response Behavior of Martensite, Bainite and Accompanied Retained Austenite in a High Carbon Bearing Steel: Mohanchand Paladugu1; Daniel Foster2; Enrique Jimenez-melero2; Lee M. Rothleutner1; R. Scott Hyde1; 1The Timken Company World Headquarters (WHQ), North Canton, OH 44720, USA; 2Materials Performance Centre, Department of Materials, The University of Manchester, UK
In this study, 52100 steel is subjected to different through hardening heat treatments that result in Martensite and/or Bainite as the major strengthening phase. Each heat treatment resulted in a major strengthening phase and accompanied retained austenite. The heat treated steels were subjected to tensile loading and simultaneously characterized by synchrotron X-Ray diffraction (SXRD). The SXRD results suggest that microstructural stability under mechanical load for a given heat treatment depends on characteristics of the resulted major strengthening phase including associated atomic lattice distortion and its volume fraction in the steel. The XRD results and associated load bearing micro mechanisms will be discussed.