Effect of vacuum heat treatment on tensile strength and fracture performance of cold-sprayed Cu-4Cr-2Nb coatings

Yu, Mei; Li, Wenya; Zhang, Chao; Liao, Hanlin

doi:10.1016/j.apsusc.2011.01.076

Cited by 15 publications

(3 citation statements)

References 14 publications

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“…However, previous investigation showed that the mechanical properties of as-sprayed coating were poor during the cold spray process due to the existence of residual stress and work hardening effect (Ref 15). The general way to further enhanced the mechanical properties of the CS deposits is via post heat treatment which was reported in some literatures (Ref [15][16][17][18]. In this study, a further investigation was performed to study the microstructure and mechanical properties of Al coating sprayed at relatively low impact velocity.…”

Section: Introductionmentioning

confidence: 99%

Strengthening Mechanism of Additively Manufactured Cold Spray Al Deposits under Low Deposition Efficiency

Lupoi

2021

Thermal Spray 2021: Proceedings From the International Thermal Spray Conference

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In this study, a novel strategy to manufacture high strength cold-sprayed Al coating by using powder with wide size distribution is proposed. The microstructure and mechanical properties of deposited coating sprayed at three typical impact velocities before and after heat treatment are investigated. Furthermore, the deposition and strengthening mechanisms of the coating sprayed at various impact velocities are clarified. The results show that the coating with higher density and mechanical properties can be successfully fabricated by cold spray at comparatively low particle impact velocity. The mechanical properties were enhanced with the contribution of heat treatment process. It is the in-process tamping effect induced by larger powder that results in the severe plastic deformation thus leads to densification and excellent mechanical properties of the cold-sprayed Al coating.

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Section: Introductionmentioning

confidence: 99%

Strengthening Mechanism of Additively Manufactured Cold Spray Al Deposits under Low Deposition Efficiency

Lupoi

2021

Thermal Spray 2021: Proceedings From the International Thermal Spray Conference

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show abstract

“…There are many chemical, petrochemical, and pharmaceutical applications as well, such as evaporation, condensation, freeze-drying, distillation, deodorization, degassing, absorption, and impregnation. Applications also include vacuum coating, 1 vacuum packing, 2,3 vacuum heat treatment, 4,5 vacuum brazing, 6,7 and vacuum cooling for food storage. 8,9 In 2003, Jet Propulsion Laboratory (JPL) of NASA built a vacuum-sealed chamber, Micro-arcsecond Metrology Testbed (MAM), for the Space Interferometry Mission (SIM).…”

Section: Introductionmentioning

confidence: 99%

Design and implementation of automatic control for a condensation-induced depressurization system

Zhang

Zhu

et al. 2018

Proceedings of the Institution of Mechanical Engineers, Part I:

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This study develops a control system to automate the operation of a condensation-induced depressurization technology, which is used to achieve sub-atmospheric pressure in an open-flow system on ground. The continuous depressurization is maintained via an integrated series of chambers inside which vacuum is regenerated by condensing and refilling of saturated steam. The low pressure generated inside the chambers is then used to alternatively extract the air out of a flow system for maintaining its sub-atmospheric pressure. The thermodynamic cycle in such a vacuum chamber consists of three sub-processes: air purging to ambient by steam refilling, depressurization by steam condensation, and air-extraction from a flow application. As one chamber undergoing these consecutive processes, another chamber operates in a coordinated different phase to seamlessly maintain a continuous air-extraction operation. This new system provides a quiet and efficient way of using low-grade energy to generate hypobaric environment for needed applications. A cascade arrangement of a proposed multiple-chamber operation is also illustrated. A control system is designed and implemented to realize the automatic and coordinated operation in a dual-chamber, laboratory-scaled system. Exemplified results on process characteristics such as chamber depressurization and air purging are also provided.

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“…[27] The researches of Cu-Cr-Nb alloys mainly focus on the alloys with high Cr and Nb content prepared by powder metallurgy, and the alloying element content is higher than 4.0 at%, thus causing the decrease of electrical conductivity. [16,21,[28][29][30] For micro-alloying Cu-Cr-Nb alloys prepared by smelting method, the precipitation of Laves Cr 2 Nb phase is also found, and the Cr 2 Nb particle sizes are in the range of 30 nm-1 μm. [3,25,31] However, there are few reports on the preparation of microalloying Cu-Cr-Nb alloys by rapid solidification and direct aging treatment.…”

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confidence: 99%

Evolution of the Microstructures and Properties of Cu‐xCr‐0.4Nb Alloys

et al. 2021

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The microstructures and properties of Cu‐xCr‐0.4Nb alloys were investigated by changing Cr composition and cooling mode. The as‐cast microstructures and fracture morphologies were observed by SEM. The morphology and size of the precipitated phase were observed by TEM. The hardness, electrical conductivity, and tensile strength of the resulting alloys were also tested. For Cu‐xCr‐0.4Nb alloys cooled in furnace, Cr2Nb particles were formed near the eutectic regions, and destroy the continuity of the eutectic regions. The Cu–Cr–Nb alloys casted in copper mold can significantly increase the solid solubility of solute elements. The microstructures are finer cellular crystals without the segregation of Cr2Nb particle. It makes the microstructures more homogeneous and greatly improves the hardness. After aging, Cr and Cr2Nb particles with the scale of 5 ≈ 10 nm were precipitated in the copper matrix. The hardness, conductivity and tensile strength can reach to 142HB, 90.52% International Annealed Copper Standard (IACS) and 427 MPa, respectively. In addition, after the alloy being softened, the Cr2Nb particles were found near the Cr particles by TEM, which inhibited the high‐temperature coarsening of precipitated Cr phase. The softening temperature of Cu‐1.0Cr‐0.4Nb alloy reaches 600 °C.

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Effect of vacuum heat treatment on tensile strength and fracture performance of cold-sprayed Cu-4Cr-2Nb coatings

Cited by 15 publications

References 14 publications

Strengthening Mechanism of Additively Manufactured Cold Spray Al Deposits under Low Deposition Efficiency

Strengthening Mechanism of Additively Manufactured Cold Spray Al Deposits under Low Deposition Efficiency

Design and implementation of automatic control for a condensation-induced depressurization system

Evolution of the Microstructures and Properties of Cu‐xCr‐0.4Nb Alloys

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