Nickel-Based Alloy Composition for Creep Strength and Crack Resistance
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Solution Overview
Problem
Existing nickel-based superalloys used in additive manufacturing processes face challenges in maintaining high creep resistance while minimizing microcracking, particularly in high-temperature applications.
Innovation Solution
A nickel-based alloy with increased hafnium content (1.8-2.2 wt%) and tailored elemental fractions, including tantalum, improves mechanical properties and reduces solidification cracking, suitable for additive manufacturing processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If nickel-based superalloys are used in additive manufacturing processes, then high creep resistance is achieved, but microcracking occurs during solidification
Solution Approach 1:
The patent modifies the chemical composition parameters of the nickel-based alloy by precisely controlling the content of hafnium (1.8-2.2 wt%), tantalum (1.9-2.1 wt%), and other elements. This parameter optimization changes the solidification behavior and microstructure development, enabling the alloy to achieve high creep resistance while minimizing microcracking during additive manufacturing processes.
Solution Approach 2:
The patent creates a composite alloy system combining nickel with multiple strengthening elements (hafnium, tantalum, cobalt, chromium, tungsten, aluminum, molybdenum). This multi-element composite composition synergistically improves creep resistance through phase formation and grain boundary strengthening, while the specific配比 reduces solidification cracking susceptibility.
2Reliability
If hafnium content is increased to reduce solidification cracking, then microcracking is minimized, but alloy complexity increases
Solution Approach 1:
The patent optimizes the hafnium content parameter to a specific range (1.8-2.2 wt%) rather than using excessive amounts. This controlled parameter change achieves effective solidification cracking resistance while avoiding unnecessary alloy complexity and cost increases associated with higher hafnium concentrations.
Solution Approach 2:
The patent applies local quality by strategically distributing multiple alloying elements in specific concentrations tailored to their individual functions: hafnium for crack resistance, tantalum for creep strength, and other elements for microstructure control. This localized optimization of properties achieves effective performance without uniform high-concentration mixing of all elements.
Data Source
AI summary
A nickel-based alloy which includes at least the following alloy elements in wt. %: cobalt (Co) 10.3-10.7, chromium (Cr) 9.8-10.2, tungsten (W) 9.3-9.7, aluminum (Al) 5.2-5.7, hafnium (Hf) 1.8-2.2, tantalum (Ta) 1.9-2.1, molybdenum (Mo) 0.4-0.6, the remainder being nickel and impurities.