Amorphous Metal Hardfacing for Uniform Crack-Free Welds
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Solution Overview
Problem
Traditional tungsten carbide-based hardfacing materials suffer from uneven distribution of hard faces due to density differences, leading to cracks and compromised structural integrity, as tungsten carbide particles settle at the bottom of the weld, leaving the top area devoid of particles and creating undesirable cracks.
Innovation Solution
Development of bulk amorphous metal (BAM) alloys with a composition of iron, chromium, manganese, molybdenum, tungsten, silicon, and boron, which have a lower density than tungsten carbide, allowing for uniform hard face distribution throughout the weld when used in plasma transfer arc (PTA) welding or thermal spraying techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If tungsten carbide particles are used to improve wear resistance, then wear resistance is improved, but density increases causing particle settlement and crack formation
Solution Approach 1:
The patent changes the density parameter of the hardfacing material from high-density tungsten carbide (15.6 g/cm³) to lower-density BAM alloy (7-8 g/cm³). This parameter change prevents gravitational settlement of particles during welding while maintaining wear resistance through the amorphous structure's inherent hardness and uniform hard face distribution throughout the weld cross-section
Solution Approach 2:
The patent employs BAM alloy as a composite material system containing iron, chromium, manganese, molybdenum, tungsten, silicon, and boron. This composite achieves superior wear resistance (matching or exceeding tungsten carbide) while maintaining lower density and uniform distribution, eliminating the need for heavy carbide particles
2Strength
If tungsten carbide particles are added to increase hardness, then wear resistance is improved, but uneven distribution occurs leading to cracks
Solution Approach 1:
The BAM alloy achieves homogeneous distribution of hardfacing throughout the weld. The amorphous structure ensures uniform mixing and distribution of alloying elements at the atomic level, creating consistent hardness and wear resistance from top to bottom of the weld without the segregation problems of particulate reinforcement
Solution Approach 2:
The patent changes the physical state parameter from particulate reinforcement to amorphous alloy structure. This transformation enables uniform distribution of hardfacing properties throughout the material, eliminating the settlement and clustering issues inherent in particle-based solutions
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 BAM alloys achieve crack-free coatings with superior wear resistance and uniform hard face distribution, matching or exceeding the performance of tungsten carbide-based materials while maintaining a lower density, thus preventing cracking and ensuring consistent wear protection from top to bottom of the weld.
Implementation Method 1
BAM alloys, applied through PTA welding or thermal spraying
Implementation Method 2
BAM alloys, applied through PTA welding or thermal spraying
Data Source
AI summary
Embodiments disclosed herein relate to the production of bulk amorphous metal (BAM) alloys comprising chromium, manganese, molybdenum, tungsten, silicon, carbon, boron, and the balance of iron to replace tungsten carbide-based welded material. The BAM alloy embodied herein can be applied through PTA welding, HVOF, TWAS, flame spraying, plasma spraying, laser, their combinations, and other coating and welding processes. When used as welded material, the density of the embodiment of around 7 grams per CC, which is less dense than the tungsten carbide customarily used, resulting in even hard faces during welding spread uniformly across the weld, therefore creating a harder and more wear-resistant weld.