Steel Powder Composition for Additive Manufacturing
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Solution Overview
Problem
Existing steel powders for additive manufacturing face challenges in achieving good printability and mechanical properties, such as strength, toughness, and isotropy, in components produced through these processes.
Innovation Solution
A steel powder with a specific composition of C 0.15-0.26, Si 0.5-1.5, Mn 0.5-1.0, Cr 0.5-1.5, Mo 0.1-0.4, V 0.05-0.15, and balanced Fe, with limited unavoidable impurities Ni, P, and S, is developed for use in additive manufacturing. This powder is suitable for processes like laser powder bed fusion and directed energy deposition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional steel powder composition is used in additive manufacturing, then the powder can be processed, but the mechanical properties (strength, toughness, isotropy) of the produced components are insufficient
Solution Approach 1:
The patent applies parameter changes by precisely controlling the chemical composition parameters of the steel powder. Specific ranges are defined for carbon (0.15-0.26%), silicon (0.5-1.5%), manganese (0.5-1.0%), chromium (0.5-1.5%), molybdenum (0.1-0.4%), and vanadium (0.05-0.15%), with strict limits on impurities like sulfur (≤0.005%) and phosphorus (≤0.03%). This systematic parameter optimization enables the powder to achieve both good printability and superior mechanical properties including yield strength ≥1000 MPa, tensile strength ≥1100 MPa, and impact toughness ≥85 J.
2Strength
If steel powder composition is optimized for strength, then mechanical properties improve, but printability deteriorates
Solution Approach 1:
The patent resolves this contradiction through comprehensive parameter optimization of the steel powder composition. The carbon content is controlled at 0.15-0.26% to balance strength and printability, silicon at 0.5-1.5% to enhance mechanical properties while maintaining sphericity, and manganese at 0.5-1.0% for toughness. Impurity elements like sulfur (≤0.005%) and phosphorus (≤0.03%) are strictly limited to ensure both printability and mechanical performance. This coordinated parameter control achieves yield strength ≥1000 MPa and tensile strength ≥1100 MPa while maintaining excellent printability.
Solution Approach 2:
The patent employs composite material principles by creating a multi-element steel alloy system that combines carbon, silicon, manganese, chromium, molybdenum, and vanadium in specific proportions. This composite composition synergistically enhances both printability and mechanical properties, achieving yield strength ≥1000 MPa and tensile strength ≥1100 MPa while maintaining good layer adhesion and surface quality during additive manufacturing.
3Strength
If high strength is achieved in additive manufactured components, then mechanical performance improves, but impact toughness decreases
Solution Approach 1:
The patent applies composite material principles by formulating a multi-element steel alloy containing carbon (0.15-0.26%), silicon (0.5-1.5%), manganese (0.5-1.0%), chromium (0.5-1.5%), molybdenum (0.1-0.4%), and vanadium (0.05-0.15%). This composite composition creates a balanced microstructure that achieves tensile strength ≥1100 MPa while maintaining impact toughness ≥85 J through synergistic interactions between alloying elements that promote both strength and ductility.
Solution Approach 2:
The patent uses parameter changes by optimizing the carbon content to 0.15-0.26%, which is sufficient for high strength but controlled to prevent excessive brittleness. Manganese is maintained at 0.5-1.0% to enhance toughness, and silicon at 0.5-1.5% to improve mechanical properties while maintaining ductility. This balanced parameter optimization achieves tensile strength ≥1100 MPa and impact toughness ≥85 J simultaneously.
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 steel powder achieves good printability and results in components with a yield strength of at least 1000 MPa, tensile strength of at least 1100 MPa, and impact toughness of at least 85 J at room temperature, demonstrating a high level of mechanical performance and isotropy in the as-built condition.
Implementation Method 1
A laser beam selectively melts the layer of powder
Implementation Method 2
the material feedstock, which may be either power or wire, is melted by a heat source and deposited in melted form onto a specified surface where it solidifies and thereby fuses with a previously formed layer
Data Source
AI summary
Described is a steel powder intended to be used in additive manufacturing, having a composition which includes in wt.-%:C 0.15-0.26,Si 0.5-1.5,Mn 0.5-1.0,Cr 0.5-1.5,Mo 0.1-0.4,V 0.05-0.15,balance Fe and unavoidable impurities;wherein the unavoidable impurities Ni, P and S are limited to:Ni equal to or less than 0.15,P max 0.03, andS max 0.005.