Microstructure and phase transformation of nickel-titanium shape memory alloy fabricated by directed energy deposition with in-situ heat treatment [PDF]
, 2022 Additive manufacturing has been vastly applied to fabricate various structures of nickel-titanium (NiTi) shape memory alloys due to its flexibility to create complex structures with minimal defects. However, the microstructure heterogeneity and secondary phase formation are two main problems that impede the further application of NiTi alloys.
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Yield strength insensitivity in a dual-phase high entropy alloy after prolonged high temperature annealing [PDF]
, 2021 Recent studies of FeMnCoCr-based high entropy alloys have demonstrated uncommon deformation behaviors such as transformation-induced plasticity, which were largely believed to be restricted to select families of steels. Coupled with the potential for entropy stabilization of high symmetry phases at high temperatures, this system represents a promising ...
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The effect of heat treatments and coatings on the outgassing rate of stainless steel chambers [PDF]
J. Vac. Sci. Technol. A 32 , 021604 (2014) ;, 2013 The outgassing rates of three nominally identical 304L stainless steel vacuum chambers were measured to determine the effect of chamber coatings and heat treatments. One chamber was coated with titanium nitride (TiN) and one with amorphous silicon (a-Si) immediately following fabrication.
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Effect of heat treatment on mechanical dissipation in Ta$_2$O$_5$ coatings [PDF]
Class.Quant.Grav.27:225020,2010, 2010 Thermal noise arising from mechanical dissipation in dielectric reflective coatings is expected to critically limit the sensitivity of precision measurement systems such as high-resolution optical spectroscopy, optical frequency standards and future generations of interferometric gravitational wave detectors.
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A new high-throughput method using additive manufacturing for alloy design and heat treatment optimization [PDF]
Materialia 13 (2020) 100835, 2020 Many alloys made by Additive Manufacturing (AM) require careful design of post-heat treatment as an indispensable step of microstructure engineering to further enhance the performance. We developed a high-throughput approach by fabricating a long-bar sample heat-treated under a monitored gradient temperature zone for phase transformation study to ...
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The effect of heating rate and soaking time on microstructure of an advanced high strength steel [PDF]
, 2019 This work focuses on the effect of soaking time on the microstructure during ultrafast heat treatment of a 50% cold rolled low carbon steel with initial ferritic-pearlitic microstructure. Dilatometry analysis was used to estimate the effect of heating rate on the phase transformation temperatures and to select an appropriate inter-critical temperature ...
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Effect of In-vitro Heat Stress Challenge on the function of Blood Mononuclear Cells from Dairy Cattle ranked as High, Average and Low Immune Responders [PDF]
BMC Vet Res 17, 233 (2021), 2021 The warming climate is causing livestock to experience heat stress at an increasing frequency. Holstein cows are particularly susceptible to heat stress because of their high metabolic rate. Heat stress negatively affects immune function, particularly with respect to the cell-mediated immune response, which leads to increased susceptibility to disease.
arxiv
Influence of heat treatment excursion on critical current and residual resistivity ratio of ITER Nb3Sn strands [PDF]
, 2017 Heat treatment is critically important to the performance of Nb3Sn superconducting strands. For very large Nb3Sn magnet coils, such as the International Thermonuclear Experimental Reactor (ITER) Central Solenoid (CS) coils, heat treatment carries risk of temperature and time excursion, which may result in performance degradation.
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Segment-Based Wall Treatment Model for Heat Transfer Rate in Smoothed Particle Hydrodynamics [PDF]
arXiv, 2023 In this study, a smoothed particle hydrodynamics (SPH) model that applies a segment-based boundary treatment is used to simulate natural convection. In a natural convection simulated using an SPH model, the wall boundary treatment is a major issue because accurate heat transfer from boundaries should be calculated.
arxiv
Nonequilibrium heat capacity [PDF]
Physical Review E 88, 062135 (2013), 2013 Development of steady state thermodynamics and statistical mechanics depends crucially on our ability to develop notions of equilibrium thermodynamics for nonequilibrium steady states (NESS). The present paper considers the development of heat capacity.
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