Phase Transformations and Microstructural Evolution: Ferrous Alloys II
Sponsored by: TMS Materials Processing and Manufacturing Division, TMS: Phase Transformations Committee
Program Organizers: Ashley Paz y Puente, University of Cincinnati; Mark Aindow, University of Connecticut; Sriswaroop Dasari, Idaho National Laboratory; Ramasis Goswami, Naval Research Laboratory; Megumi Kawasaki, Oregon State University; Eric Lass, University of Tennessee-Knoxville; Joshua Mueller, Michigan Technological University; Eric Payton, University of Cincinnati; Le Zhou, Marquette University

Monday 2:00 PM
March 20, 2023
Room: 25C
Location: SDCC

Session Chair: Megumi Kawasaki, Oregon State University


2:00 PM  
Study of the Martensitic Transformation by Deformation of Traction in the Steels AISI 304 Through Electrical Resistivity: Edgar Apaza Huallpa1; Hélio Goldenstein2; Esequiel Nicolas Collado Cardenas1; Elmer Antonio Mamani Calcina1; Juan Carlos Negron Lopez1; Lino Reynaldo Quispe Cardenas1; Alejandro Boris Marquez Guevara1; Erick Omar Tunqui Labra1; 1Universidad Nacional de San Agustin de Arequipa, Perú; 2Universidade de São Paulo
    Studies related to martensitic transformation have been increasing in recent years, for this case, tensile deformation (uniaxial tension) was experienced using AISI 304 stainless steel as a study material, the specimens were machined under the ASTM E8 / E8M standard. This phase change was measured by the four-point resistivity test consisting of the passage of electrical current through the alloyed metal and the voltage supplied by a source, this was analyzed by the voltage changes using a voltmeter. To corroborate this phase change, its microstructure was observed by metallographic analysis in specimens, without deformation and with tensile deformation, where you can see the presence of martensite after the test, so that a characterization method could be established to identify the martensite formed during the mechanical test.

2:20 PM  
Effect of High Temperatures on the Delamination Susceptibility of Chromium Carbide Overlays: Alejandro Alvarez1; Lingyun Wei1; Jonas Svantesson1; Jan-Erik Hedin1; Petter Eklof1; 1SSAB
    Weld overlays are often used by industry to improve the mechanical and/or corrosive properties of low alloy steel substrates. Chromium-carbide overlays are commonly used in the mining and agricultural industries to extend the service life of components subjected to abrasive and/or impact wear. This study intends to explain the solidification behavior across the transition zone of Cr-carbide overlays. Furthermore, this study explains the effect of exposure to high temperatures on solid-state precipitation, hardening, and delamination. LOM/SEM analysis of the overlays reveals austenitic solidification at the fusion boundary with interdendritic eutectic phase. EDS mapping shows the decomposition of austenite through solid-state precipitation of Cr-carbides at temperatures ranging from 700 to 900 C. Thermodynamic computational modeling suggests that such temperatures enable the nucleation/growth of Cr-carbides. Microhardness testing also displays an increase in hardness at the fusion boundary from 300 HV0.3 at 700 C to 465 HV0.3 at 900 C, resulting with delamination.

2:40 PM  
Monte Carlo Simulations for Synthetic Microstructure Generation of M23C6 Precipitation in 347H Stainless Steels: William Frazier1; Arun Sathanur1; Ram Devanathan1; Keerti Kappagantula1; 1Pacific Northwest National Laboratory
    A Monte Carlo simulation method capable of modeling the phase transformation behaviors of 347H stainless steels was developed for the purpose of producing synthetic microstructures that approximate its microstructural evolution under aging periods of up to 10,000 hours at temperatures between 550 °C and 750 °C. To accomplish this, experimental data from the literature was used to properly parameterize simulations and replicate the nucleation and growth kinetics of M23C6 particles within the alloy. These simulations were found to have considerable fidelity to previous efforts for model the precipitation of M23C6 in other 300 series stainless steel alloys when adjusted for aging temperature, duration, and carbon composition. Synthetic 347H microstructures were then generated that accounted the effects of aging temperature, duration, creep conditions, and the presence of boron within the microstructure. Current efforts to expand our modeling to incorporate additional precipitation behaviors are also discussed.

3:00 PM  Cancelled
Development of a Phase Field Model of Microstructural Evolution in Fe-C Steels during Induction Coupled Thermomagnetic Processing: Christopher Lovenduski1; Michael Tonks1; 1The University of Florida
    Induction coupled thermomagnetic processing (ITMP) is a novel heat treatment technology consisting of induction heating and the application of a high-strength static magnetic field during cooling. Experimental studies have shown this thermomagnetic treatment of steels to significantly alter microstructural evolution during austenite decomposition. Using a quantitative mesoscale phase field model developed in the Multiphysics Object-Oriented Simulation Environment (MOOSE) finite element framework, this project seeks to elucidate the mechanisms responsible for this altered microstructural evolution during ITMP. Magnetic field effects on kinetic, thermodynamic, and micromechanical properties are parameterized from experimental measurement and atomistic modeling by collaborators. With experimental characterization of ITMP steel samples by collaborators at the University of Florida and Oak Ridge National Laboratory, the phase field model is validated, and model uncertainty is quantified.