Layered Entropy Alloy Resists Hydrogen Cracking
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Solution Overview
Problem
Hydrogen-induced cracking (HIC) poses a significant risk to metallic components in oil and gas operations, with existing high-strength alloys lacking sufficient resistance, leading to premature failures and costly repairs.
Innovation Solution
A layered metal alloy is developed with a core and skin structure, where the core has undergone plastic deformation and heat treatment, and the skin has a higher entropy, creating a microstructure that traps hydrogen and inhibits its diffusion, thereby suppressing crack initiation and propagation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If high strength metallic alloys are used, then mechanical strength is improved, but resistance to hydrogen induced cracking deteriorates
Solution Approach 1:
The patent applies local quality by creating a functionally graded alloy where composition and microstructure vary spatially. The alloy transitions from a high-entropy region with superior hydrogen resistance to a low-entropy region with high mechanical strength, allowing each region to optimize its local properties for the specific requirements of resisting hydrogen-induced cracking while maintaining overall structural integrity
Solution Approach 2:
The patent employs composite materials by combining multiple metallic elements (Ni, Co, Cr, Mn, Fe, Al, Ti, V) in specific proportions to create a functionally graded alloy. This composite structure with varying entropy regions provides both the hydrogen resistance properties of high-entropy alloys and the mechanical strength properties of conventional low-entropy alloys, resolving the contradiction between these two properties
2Ease of manufacture
If uniform alloy composition is used, then manufacturing simplicity is improved, but hydrogen diffusion resistance deteriorates
Solution Approach 1:
The patent implements local quality through a functionally graded composition where the alloy transitions from high-entropy to low-entropy regions. This spatial variation in composition creates corresponding variations in microstructure and hydrogen diffusion characteristics, with the high-entropy region providing superior hydrogen trapping and diffusion resistance, thereby addressing the hydrogen diffusion problem while maintaining manufacturing feasibility through controlled composition gradients
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 layered metal alloy effectively resists hydrogen-induced cracking without compromising bulk properties, enhancing the durability and reliability of metallic components in HIC-prone environments.
Implementation Method 1
the skin has a higher entropy, creating a microstructure that traps hydrogen and inhibits its diffusion
Implementation Method 2
suppressing crack initiation and propagation
Data Source
AI summary
The disclosure provides for a layered metal with resistance to hydrogen induced cracking and method of production thereof, comprising a core metal alloy and a skin metal alloy. The core metal alloy comprises twinned boundaries. The core metal alloy has undergone plastic deformation and a heat treatment. The core metal alloy comprises nickel and cobalt. The skin metal alloy is disposed on the core metal alloy, wherein the skin metal alloy comprises an entropy greater than the core metal alloy. The core metal alloy comprises a greater density of twinned boundaries than the skin metal alloy. The skin metal alloy comprises a stacking fault energy of at least about 50 mJ/m2, and the skin metal alloy comprises iron, aluminum, and boron.