A5009876056- Microstructure and Mechanical Properties of Steels
- Metal Alloys Wear and Properties
- Hydrogen embrittlement and corrosion behaviors in metals
- Metallurgy and Material Forming
- Welding Techniques and Residual Stresses
- High-Velocity Impact and Material Behavior
- Fatigue and fracture mechanics
- High-pressure geophysics and materials
- Thermal and Kinetic Analysis
- Aluminum Alloy Microstructure Properties
- High Entropy Alloys Studies
- Adhesion, Friction, and Surface Interactions
- Microstructure and mechanical properties
- Brake Systems and Friction Analysis
- Electromagnetic Effects on Materials
- High-Temperature Coating Behaviors
- Energetic Materials and Combustion
- Advanced Materials Characterization Techniques
- Electromagnetic Launch and Propulsion Technology
- Additive Manufacturing Materials and Processes
- Mechanical stress and fatigue analysis
- High Temperature Alloys and Creep
Los Alamos National Laboratory
2020-2024
Colorado School of Mines
2019-2022
Steels are ubiquitous due to their affordability and the landscape of useful properties that can be generated for engineering applications. But further expand performance envelope, one must able understand control microstructure development by alloying processing. Here we use multiscale, advanced characterization better structural chemical evolution AISI 4340 steel after quenching tempering (Q&T), including role quench rate short-time, isothermal below 573 K (300 °C), with an emphasis on...
Tempering reactions are critical to microstructure and property control in martensitic steels. Here, retained austenite decomposition cementite precipitation monitored using Mössbauer spectroscopy 4340 300-M steel under conventional rapid tempering conditions. times compared at a constant tempered hardness by increasing temperatures associated with short time conditions achieve equivalent matrix softening that of longer times. Time-temperature combinations provide generated microstructures...
Tempered martensite embrittlement (TME) is investigated in two medium carbon, high strength steels, 4340 (low silicon) and 300-M (high silicon), via rapid (1, 10, or 100 s) conventional (3600 tempering. Rapid tempering of diminishes the depth TME toughness trough, where improvements impact correspond to suppression retained austenite decomposition. In 300-M, decomposition suppressed an even greater extent by While improves overall after tempering, severity remains consistent across...
The goal of this work is to investigate the effect varying phase fractions on overall spall strength and damage behavior a material. Specifically, two plain carbon, ferrite–pearlite steels (1045 A283) were subjected recovery experiments pearlite fraction total damage. A283 (20% pearlite) alloy exhibited higher Hugoniot elastic limit compared with 1045 (60% pearlite). Discontinuous continuous yielding behaviors observed at quasi-static dynamic rates for 1045, respectively. was connected...
The dynamic spall properties of an additively manufactured (AM), CoCrFeMnNi high-entropy alloy (HEA) were investigated as a function processing defects. Laser Powder Bed Fusion (LPBF) was used to manufacture HEA samples that subsequently subjected shock loading through plate impact experiments. Seven different combinations laser power and scan speeds explored, ranging from 180-280 W 925-1350 mm/s, respectively. All considered within the bounds lack-of-fusion keyholing defects based on...
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Inert simulant materials, or “mocks”, are often used as surrogates for plastic-bonded explosives (PBX) in non-detonative tests order to mitigate hazards. Mocks should reproduce many properties of the explosive possible, including structural behavior a variety thermal and mechanical environments. Recently, molecular crystal idoxuridine (IDOX) has been identified an ideal mock main component polymer-matrix composite PBX 9501, performed favorably under quasistatic loading conditions. Here,...
Interfacial friction is a key aspect to understanding and modelling dynamic processes in which materials interact. However, complex phenomenon that depends on multitude of factors, including sliding velocity. Understanding how behavior changes as function rate thus crucial for accurately simulating processes. Recent literature has shown the split-Hopkinson pressure bar can be adapted measurements associated with high rates. The present work introduces an insert designed transferrable between...