Aluminum-Coated Blank Joint Composition for Hot-Stamped Strength
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Solution Overview
Problem
Existing methods for manufacturing aluminum-based plated blanks face challenges in minimizing the deterioration of hardness and physical properties at the blank joint, preventing defects like segregation, and maintaining mechanical properties after hot stamping.
Innovation Solution
The development of an aluminum-based plated blank comprising a first and second plated steel plate connected by a joint, where each plate includes a base steel with a plated layer containing aluminum, and the joint has an average aluminum content of 0.5 wt% to 1.5 wt%, with a standard deviation of 0 to 0.25, to ensure even distribution and prevent segregation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If aluminum-silicon or zinc-based plated layer is used for laser bonding, then the plated steel plate material can be joined, but the plating ingredient penetrates into the molten pool and deteriorates mechanical properties of the junction portion
Solution Approach 1:
The patent introduces an intermediary substance (flux or coating layer) between the aluminum-based plated layer and the base steel plate. This intermediary prevents direct penetration of aluminum into the molten pool during laser bonding, thereby maintaining the mechanical properties of the junction portion while still enabling successful bonding. The intermediary acts as a barrier that controls the interaction between the plated layer and the molten metal.
Solution Approach 2:
The patent modifies the chemical composition parameters of the plated layer by controlling the aluminum content within a specific range (5-15 wt%) and limiting silicon content to 0.01-3 wt%. By adjusting these compositional parameters, the material achieves optimal balance between bondability and mechanical property preservation, preventing excessive aluminum penetration while maintaining laser bonding capability.
2Productivity
If high bonding speed is used for laser joining, then productivity is improved, but the plated layer ingredient cannot be evenly diluted and segregation occurs
Solution Approach 1:
The patent applies preliminary action by pre-heating the plated steel plates or pre-applying a flux coating before laser bonding. This preliminary treatment prepares the material state to facilitate more uniform mixing and dilution of the plated layer ingredients during the high-speed bonding process, preventing segregation even at high bonding speeds. The preliminary action creates optimal initial conditions for homogeneous ingredient distribution.
Solution Approach 2:
The use of flux or coating layer as an intermediary substance promotes uniform distribution of aluminum and silicon ingredients during the bonding process. The flux acts as a fluid medium that facilitates homogeneous mixing of the plated layer materials with the base steel, preventing segregation and ensuring uniform ingredient distribution throughout the junction portion.
3Strength
If aluminum content in joint is increased, then the plated layer penetration is reduced, but the mechanical properties and hardness deterioration is minimized only within specific range
Solution Approach 1:
The patent optimizes the aluminum content parameter within a specific range (5-15 wt%) in the plated layer. This parameter change achieves the right balance: sufficient aluminum content to prevent excessive penetration and maintain hardness, while not so high as to cause other detrimental effects. The controlled parameter range ensures optimal mechanical properties and minimizes hardness deterioration in the junction portion.
Solution Approach 2:
The patent creates a composite structure in the junction portion by controlling the distribution and content of aluminum and silicon elements. The resulting composite material in the junction zone has optimized properties that resist hardness deterioration while preventing harmful penetration effects. The composite nature of the joint allows for tailored mechanical properties through controlled ingredient distribution.
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
This solution effectively minimizes the deterioration of hardness and physical properties at the blank joint, prevents defects such as segregation, and maintains or exceeds the mechanical properties of the individual steel plates after hot stamping.
Implementation Method 1
providing a pillar wire at a boundary between the first plated steel plate and the second plated steel plate, and forming a joint connecting the first plated steel plate and the second plated steel plate by irradiating a laser
Implementation Method 2
because the ingredients of the plated layer penetrates into the molten pool of the junction (joint) portion, the junction portion has different properties from the parent material
Data Source
AI summary
An exemplary embodiment of the present invention discloses an aluminum-based blank including: a first plated steel plate; a second plated steel plate connected to the first plated steel plate; and a joint connecting the first plated steel plate and the second plated steel plate at a boundary between the first plated steel plate and the second plated steel plate.