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Search Publications by: Steven P. Mates (Fed)

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Displaying 1 - 25 of 119

Effect of austenite fraction and stability on strength-hardening-ductility in additively manufactured 17-4 PH stainless steel containing nitrogen

June 30, 2023
Author(s)
Saadi Habib, Steven P. Mates, Fan Zhang, Mark R. Stoudt, James Zuback, Olaf Borkiewicz
Additively-manufactured (AM) 17-4 precipitation-hardening (PH) martensitic stainless steel (SS) built from nitrogen-atomized powder often retains a large volume fraction of austenite. The retained austenite lowers the yield strength compared to both

Dynamic Plasticity Model for Rapidly Heated 1045 Steel Up to 1000 degC

August 27, 2021
Author(s)
Steven Mates, Shengyen Li
The National Institute of Standards and Technology (NIST) developed an experimental technique to measure the dynamic flow stress of metals under rapid heating to study their time-dependent plastic response when heating times are short enough to interrupt

Considering the influence of heating rate, complex hardening and dynamic strain agingin AISI 1045 machining: experiments and simulations

July 16, 2021
Author(s)
Friedrich Bleicher, Christian Baumann, Stephan Krall, Steven P. Mates, Sibylle Herzig, Tim Alder, Norman Herzig
In the modelling of machining operations, constitutive models must consider the material behavior subject to high plastic strains, high strain rates, high temperatures and high heating rates. A new material model for AISI 1045, which captures time

Intercritical annealing to achieve a positive strain rate sensitivity of mechanical properties and suppression of plastic instabilities in multi-phase medium-Mn steels

October 29, 2020
Author(s)
Jake Benzing, William E. Luecke, Steven Mates, Dirk Ponge, Dierk Raabe, James Wittig
The present work investigates the room temperature tensile properties of a cold-rolled Fe-12Mn- 3Al-0.05C (% by mass) steel designed to have a multi-phase microstructure and positive strain rate sensitivities. An increase in intercritical annealing time

Dynamic Compression Strength of Ceramics: What was Learned from an Interlaboratory Round Robin Exercise

September 4, 2020
Author(s)
Jeffrey Swab, Wayne Chen, James Hogan, Hangjie Liao, Calvin Lo, Steven Mates, Christopher Meredith, John Pittari, Richard Rhorer, George Quinn
The dynamic compressive strength of a commercial alumina was determined by five participants using the Split-Hopkinson pressure bar (SHPB) method with a dumbbell-shaped specimen. Each participant used their own SHPB test apparatus and imaging set-up to

Dynamic Compression Tests of Alumina Dumbbells Using a Spherical Joint

December 19, 2019
Author(s)
Richard Rhorer, George D. Quinn, Steven Mates
The dynamic compressive strength of ceramic armor materials is difficult to obtain experimentally due to the sensitivity of fracture strength to even small bending stresses. In this work we introduce a spherical joint into a compression Kolsky bar to

Rate effects on transformation kinetics in a metastable austenitic stainless steel

November 15, 2017
Author(s)
Rakan Alturk, William E. Luecke, Steven Mates, A Araujo, K. S. Raghavan, Fadi Abu-Farha
In this study, the effects of strain rate on the mechanical properties and the strain-induced austenite-to-martensite transformation in 201 austenitic stainless steel (SS201) were investigated. This grade was selected as a low-cost stainless steel with