Low-Density Steel Powder for Additive Manufacturing
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Solution Overview
Problem
Existing steel powders used in powder technology face challenges in achieving low density, non-magnetism, resistance to nickel allergies, and reduced self-ignition and explosion tendencies, while maintaining mechanical strength and corrosion resistance.
Innovation Solution
A steel powder composition with specific weight percentages of C, Mn, Al, Cr, Si, Ti, and optional elements, produced through gas atomization, with a balanced alloying content to minimize the explosion factor and ensure austenitic properties, is developed. This composition includes a method of atomizing a steel melt, extracting particles with a median diameter less than 100 μm, and using air classification to reduce self-ignition risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If aluminium is added to reduce steel density, then density decreases, but the steel becomes more prone to self-ignition and explosion
Solution Approach 1:
The patent applies parameter changes by precisely controlling the aluminium content within 5.0-10.0 wt.% and balancing it with other alloying elements (Mn: 14.0-30.0%, Cr: 3.0-10.0%, Ti: 0.05-1.0%) to achieve the desired density reduction while maintaining explosion safety. This quantitative parameter optimization resolves the contradiction between density reduction and explosion risk.
Solution Approach 2:
The patent creates a composite alloy system combining multiple elements (Fe, Mn, Al, Cr, Si, Ti, C) where each element serves multiple functions. The synergistic interaction between aluminium (density reduction) and manganese (austenite stabilization, explosion risk mitigation) creates a composite material that simultaneously achieves low density and reduced self-ignition tendency.
2Object-affected harmful factors
If manganese is used to stabilize austenite and replace nickel, then nickel content is reduced eliminating allergic reactions, but the steel may become magnetic due to ferrite phase formation
Solution Approach 1:
The patent uses parameter changes by optimizing the manganese content (14.0-30.0 wt.%) and carbon content (0.05-2.0 wt.%) to maintain austenite phase stability. The specific composition ranges ensure sufficient nickel replacement while preventing excessive ferrite formation that would cause magnetism, thus resolving the contradiction between allergy safety and phase stability.
Solution Approach 2:
The patent applies local quality by creating an austenitic microstructure with specific local composition characteristics. The controlled distribution of alloying elements (particularly Mn and C) at the microstructural level ensures austenite stabilization without triggering unwanted phase transformations, maintaining both non-magnetic properties and allergy safety.
3Manufacturing precision
If fine powder fractions are extracted for powder technology applications, then manufacturing precision is improved, but the risk of self-ignition and explosion increases
Solution Approach 1:
The patent applies parameter changes by controlling the median particle diameter within specific ranges (5-50 μm or 10-100 μm) and balancing this with the chemical composition (Al: 5.0-10.0%, Ti: 0.05-1.0%). This dual parameter control achieves the desired manufacturing precision while mitigating the increased explosion risk associated with fine particles through compositional optimization.
Solution Approach 2:
The patent converts the harmful effect of fine particle size (increased explosion risk) into a benefit by optimizing the chemical composition to reduce overall reactivity. The controlled aluminium and titanium content, combined with specific manganese levels, transforms the inherently dangerous fine powder into a safe material that maintains both fine particle characteristics and low explosion risk.
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 resulting steel powder exhibits reduced self-ignition and explosion risks, maintains mechanical strength and corrosion resistance, is non-magnetic, and does not cause nickel allergies, with a density below 7.20 g/cm3 and an explosion factor less than 3.0 MJ/kg*μm−0.5, suitable for various manufacturing methods like metal injection molding and additive manufacturing.
Implementation Method 1
providing a powder by atomising the steel melt
Implementation Method 2
using air classification to reduce self-ignition risks
Data Source
AI summary
A steel powder is provided. The steel powder has a composition of, in wt. %, C 0.05-2.0, Mn 14.0-30.0, Al 5.0-10.0, Cr 3.0-10.0, Si 0.1-2.0, Ti 0.05-0.5, and, as optionals, Ni 0.0-0.2, N 0.0-1.0, O 0.0-0.50, with a balance of Fe and unavoidable impurities. A method of producing the powder is also provided.