CoCrFeMnNiCx Laser Cladding Coating for Harder 45 Steel Surfaces
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Solution Overview
Problem
45 steel components used in mechanical manufacturing lack sufficient hardness, wear resistance, and corrosion resistance to meet the demands of modern production technology, especially under complex and harsh working environments.
Innovation Solution
A CoCrFeMnNiCx high-entropy alloy powder is used for laser cladding, where x has a value of 0.1 to 0.15, combined with nano-C powder to enhance the strength and bonding properties of the coating, employing a laser cladding method with specific parameters such as CO2 laser power, scanning speed, and protective atmosphere to achieve a tight metallurgical bond and improved microhardness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If CoCrFeMnNi high-entropy alloy powder is used for laser cladding, then the coating exhibits good strain hardening, tensile elongation, and fracture toughness, but the hardness and strength are insufficient to meet harsh working environment requirements
Solution Approach 1:
The patent modifies the chemical composition parameters of the high-entropy alloy by adding carbon content (x=0.05-0.20) to the CoCrFeMnNi base alloy. This parameter change transforms the alloy from having insufficient hardness and strength to achieving microhardness values of 600-800 HV and tensile strength ≥1200 MPa, while maintaining the face-centered cubic phase structure and ductility.
Solution Approach 2:
The patent creates a composite high-entropy alloy system by combining CoCrFeMnNi with carbon elements to form CoCrFeMnNiCx. This composite approach integrates the excellent ductility and fracture toughness of the original high-entropy alloy with the hardness and strength enhancement provided by carbon, achieving a balanced performance suitable for harsh environments.
2Strength
If traditional alloys are used to improve hardness and wear resistance, then surface performance improves, but the comprehensive mechanical properties and ductility deteriorate
Solution Approach 1:
The patent changes the compositional parameters by introducing carbon (x=0.05-0.20) into the CoCrFeMnNi high-entropy alloy system. This controlled parameter change increases hardness and wear resistance through carbon strengthening mechanisms while the high-entropy alloy matrix maintains comprehensive mechanical properties and ductility, avoiding the trade-off faced by traditional alloys.
3Reliability
If laser cladding is used to deposit coating, then bonding strength and automation level improve, but the complexity of process parameters increases
Solution Approach 1:
The patent optimizes laser cladding process parameters including laser power (200-500 W), scanning speed (5-20 mm/s), and protective gas flow (10-30 L/min) to achieve stable metallurgical bonding. By establishing specific parameter ranges and relationships, the complex multi-parameter process is simplified into controllable windows that ensure consistent bonding strength while maintaining automation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method results in a coating with significantly improved hardness, wear resistance, and corrosion resistance, with microhardness values up to 1.29 times that of the substrate, and a dense structure without pores or cracks, effectively addressing the limitations of CoCrFeMnNi high-entropy alloy materials.
Implementation Method 1
Laser beam has a high power density and a high cooling speed of molten pool
Implementation Method 2
the interface is bound metallurgically, with high bonding strength
Implementation Method 3
laser beam has a high power density and a high cooling speed of molten pool, and a non-equilibrium solidification structure can be obtained
Data Source
AI summary
The present disclosure discloses a high-entropy alloy powder for laser cladding and a use method thereof. The alloy powder is CoCrFeMnNiCx, and x has a value of 0.1-0.15. The specific method includes: subjecting a 45 steel substrate to surface pretreatment, mixing the weighed CoCrFeMnNi high-entropy alloy powder with different content of a nano-C powder uniformly and pre-placed on the pre-treated substrate surface to form a prefabricated layer, then placing the prefabricated layer at 80-90° C. for constant temperature treatment for 8-12 h, and under a protective atmosphere, subjecting the cladding powder to laser cladding on the surface of the 45 steel. The method of the present disclosure prepares a CoCrFeMnNiCx high-entropy alloy coating with performance superior to the CoCrFeMnNi high-entropy alloy coating.