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Metallic Solids

Metallic Solids

Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....

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High-Entropy Alloy Activating Laves-Phase Network for Multi-Component Metallic Coatings with High Hardness.

Ao Yan¹, Guoxing Chen¹, Huiqiang Ying¹

¹Herbert Gleiter Institute of Nanoscience, School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China.

Nanomaterials (Basel, Switzerland)

|June 26, 2024

Summary

Adding WMoTaNb refractory high-entropy alloy significantly enhances laser-cladded 316L stainless steel. This composite coating shows doubled microhardness and improved wear resistance, overcoming limitations of standard 316L steel.

Keywords:

Laves phase strengthening additive manufacturing high-entropy alloy

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Area of Science:

Materials Science
Surface Engineering
Metallurgy

Background:

Laser-cladding 316L stainless steel exhibits low hardness and poor wear resistance, limiting its industrial applications.
Developing strategies to improve the mechanical properties of 316L stainless steel coatings is crucial for broader use.

Purpose of the Study:

To enhance the hardness and wear resistance of laser-cladded 316L stainless steel.
To investigate the strengthening effect of WMoTaNb refractory high-entropy alloy as a reinforcement.

Main Methods:

Laser cladding of 316L stainless steel with WMoTaNb high-entropy alloy.
Microstructural characterization of the composite coating.
Evaluation of microhardness and wear resistance.

Main Results:

The composite coating consists of a BCC Fe-based solid solution, network Laves phase (Fe2X), and FCC (Ta, Nb)C phase.
The network Laves phase in the inter-dendrites significantly contributes to increased microhardness.
Microhardness nearly doubled compared to the base 316L coating, with improved wear resistance.

Conclusions:

WMoTaNb refractory high-entropy alloy effectively strengthens laser-cladded 316L stainless steel.
The enhanced microstructure provides superior hardness and wear performance.
This approach offers a viable method for fabricating high-performance 316L stainless steel coatings.