BeCu Ring Heat Treatment for Fine Grain and Conductivity
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Solution Overview
Problem
Conventional metal rings made from beryllium-copper alloys face issues with surface quality longevity, ductility, formability, ultrasonic inspectability, conductivity, and lack of grain size refinement, leading to increased manufacturing costs and reduced productivity.
Innovation Solution
A process involving pre-forging, hot working, solution annealing, quenching, and age hardening of beryllium-copper alloy billets to produce metal rings with a fine and uniform grain structure, enhanced yield strength, hardness, and electrical conductivity, while maintaining surface quality and reducing wall thickness significantly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional metal ring manufacturing processes are used, then manufacturing cost is reduced, but surface quality longevity deteriorates
Solution Approach 1:
The patent applies parameter changes by implementing specific heat treatment parameters (solution annealing at 780-800°C for 1.5-4 hours, quenching from 750-850°C, age hardening at 385-400°C for 2-4 hours) and processing parameters (preheating at 800-850°C for 8+ hours, hot working at 750-850°C) to achieve superior surface quality longevity while maintaining economical manufacturing through process optimization
2Device complexity
If conventional metal ring manufacturing processes are used, then manufacturing simplicity is maintained, but ductility deteriorates
Solution Approach 1:
The patent segments the manufacturing process into distinct sequential stages: preheating, hot working/forging, soaking, ring rolling, solution annealing, quenching, age hardening, and air cooling. Each stage is optimized independently to contribute to overall ductility improvement, with the multi-stage approach achieving percent elongation of at least 6% while maintaining manageable process complexity through standardized procedures
3Loss of time
If conventional metal ring manufacturing processes are used, then processing time is reduced, but grain size refinement deteriorates
Solution Approach 1:
The patent applies preliminary action through extended preheating (at least 8 hours at 800-850°C) and soaking (at least 2 hours at 815-835°C) stages before the main heat treatment processes. These preliminary actions ensure uniform temperature distribution and proper microstructural preparation, enabling effective grain size refinement to achieve fine and uniform grain structure while managing overall processing time through optimized subsequent faster cooling and hardening stages
4Device complexity
If conventional metal ring manufacturing processes are used, then manufacturing simplicity is maintained, but yield strength deteriorates
Solution Approach 1:
The patent exploits phase transitions through solution annealing (780-800°C for 1.5-4 hours) where the alloy reaches a single-phase beta region, followed by quenching that transforms the microstructure, and age hardening (385-400°C for 2-4 hours) that precipitates strengthening phases. This controlled phase transition sequence achieves 0.2% offset yield strength of at least 760 MPa while maintaining process simplicity through well-established heat treatment methodologies
5Ease of manufacture
If conventional metal ring manufacturing processes are used, then manufacturing cost is reduced, but electrical conductivity deteriorates
Solution Approach 1:
The patent optimizes parameter changes by controlling the timing and temperature of heat treatment stages, particularly solution annealing at 780-800°C followed by quenching and age hardening at lower temperatures (385-400°C). This parameter control achieves electrical conductivity of at least 25% IACS while maintaining cost-effectiveness by avoiding excessive heat treatment durations and utilizing efficient cooling methods
6Device complexity
If conventional metal ring manufacturing processes are used, then manufacturing simplicity is maintained, but formability deteriorates
Solution Approach 1:
The patent applies dynamics by implementing hot working and ring rolling at elevated temperatures (750-850°C) where the material exhibits enhanced plasticity and formability. The dynamic temperature control during forming operations, combined with the sequential heat treatment stages, enables complex ring geometries with uniform wall thickness while maintaining process simplicity through standardized hot working procedures
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 process results in metal rings with improved mechanical properties, extended surface longevity, and increased productivity, allowing for more economical processing and enhanced performance in various applications.
Implementation Method 1
The billet is preheated at a temperature of 800°C to 850°C, including 820°C, for a period of at least 8 hours
Implementation Method 2
The ring is then solution annealed at a temperature of 780°C to 800°C for a period of at least 1.5 hours
Implementation Method 3
Immediately following solution annealing, the ring is quenched in a quench medium (such as water)
Implementation Method 4
The ring is then age hardened by heat treating at a temperature of 385°C to 400°C for a period of about 3 hours
Implementation Method 5
The preform is then hot worked again via ring rolling the preform at a temperature of 750°C to 850°C to form a ring having a wall thickness
Data Source
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AI summary
Processes are disclosed for forming beryllium-copper metal rings having a fine and uniform grain structure. A raw BeCu casting is pre-forged and turned to form a BeCu billet. The BeCu billet is subjected to various heat treatment and cooling cycles to obtain / maintain combinations of advantageous material properties. Generally, the BeCu billet is preheated, hot worked via forging, heated again, hot worked again via ring rolling followed by air cooling, solution annealed followed by quenching, and heated a final time followed by air cooling.