Stainless Steel Powder Composition for Additive Manufacturing
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Solution Overview
Problem
Current stainless steel alloy powders for additive manufacturing lack optimal properties for complex geometries, toughness, and resistance to defects like pores and corrosion, limiting their performance in additive manufacturing processes.
Innovation Solution
Development of stainless steel alloy powders with specific compositions, including 13.25% to 14.75% chromium, 4.5% to 5.5% nickel, 0.11% to 0.17% carbon, and additional elements like titanium, vanadium, tungsten, and molybdenum, which provide improved toughness, corrosion resistance, and the ability to accommodate defects through martensitic microstructure and ε-carbides, enhancing the material's strength and manufacturing capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional stainless steel alloy powders are used for additive manufacturing, then the manufacturing process can be performed, but the resulting components exhibit insufficient toughness and resistance to stress corrosion cracking
Solution Approach 1:
The patent modifies the chemical composition parameters of stainless steel alloy powder by precisely controlling the content of alloying elements (Ni: 4.5-5.5%, Cr: 13.25-14.75%, Cu: 0.50-1.00%, Mn: 0.50-1.00%, Mo: 0.40-0.60%, Ti: 0.01-0.05%, V: 0.01-0.05%, C: 0.13-0.17%). This compositional optimization resolves the contradiction by achieving both improved toughness and enhanced resistance to stress corrosion cracking through balanced alloying
Solution Approach 2:
The patent creates a composite microstructure within the stainless steel alloy by incorporating multiple alloying elements that form different phases and precipitates. The combination of Ni, Cr, Cu, Mn, Mo, Ti, and V creates a complex microstructure with martensitic matrix and precipitate strengthening, which simultaneously improves toughness and corrosion resistance
2Reliability
If conventional stainless steel alloy powders are used for additive manufacturing, then production can proceed, but the components exhibit poor fatigue performance and susceptibility to manufacturing defects
Solution Approach 1:
The patent optimizes chemical composition parameters to improve fatigue performance and defect tolerance. Specifically, the controlled addition of Ti (0.01-0.05%) and V (0.01-0.05%) creates fine precipitates that strengthen the matrix and inhibit crack propagation, while the balanced Cr (13.25-14.75%) and Ni (4.5-5.5%) content ensures corrosion resistance that prevents defect initiation
Solution Approach 2:
The patent converts potential harmful effects of alloying element interactions into beneficial microstructural features. The controlled composition allows formation of beneficial precipitates and phases during additive manufacturing that enhance fatigue performance and defect tolerance, transforming what could be microstructural imperfections into strengthening mechanisms
3Strength
If stainless steel alloy powders with optimized composition are used, then improved mechanical properties and corrosion resistance are achieved, but the complexity of alloy formulation increases
Solution Approach 1:
The patent manages alloy formulation complexity by establishing specific, narrow composition ranges for each element rather than using broad or undefined compositions. The precise parameter specifications (e.g., Ni: 4.5-5.5%, Cr: 13.25-14.75%) provide clear manufacturing targets that balance performance optimization with manufacturing feasibility, resolving the contradiction between improved mechanical properties and formulation complexity
Data Source
AI summary
Exemplary alloys may comprise, by weight percentage, 13.25% to 14.75% chromium; 4.5% to 5.5% nickel; 0.11% to 0.17% carbon; 0.01% to 0.31% titanium; and the balance of weight percent comprising iron and incidental elements and impurities. Exemplary methods may include conducting additive manufacturing with an atomized alloy powder to generate a manufactured article, where the atomized alloy powder may comprise, by weight percentage, 13.25% to 14.75% chromium; 4.5% to 5.5% nickel; 0.11% to 0.17% carbon; 0.01% to 0.31% titanium; and the balance of weight percent comprising iron and incidental elements and impurities.