Explosive-Welded Cladding for Wear Resistance and Workability
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Solution Overview
Problem
Existing claddings for production devices and crushers face challenges in achieving high abrasion resistance and workability due to hardness differences between bonded alloys, leading to cracking, poor dimensional accuracy, and increased manufacturing costs.
Innovation Solution
A cladding comprising a low-hardness first alloy bonded with a high-hardness second alloy, where the hardness difference is HRC 44 or more, achieved through explosive welding and subsequent quenching or solution treatment and aging heat treatment, ensuring strong bonding and high abrasion resistance without cracking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the hardness of the alloy is increased to improve abrasion resistance, then abrasion resistance is improved, but manufacturing workability deteriorates
Solution Approach 1:
The alloy plate is divided into two distinct layers: a soft base layer for easy manufacturing and a hard cladding layer for abrasion resistance. This segmentation allows each layer to be optimized independently for its specific function, resolving the contradiction between workability and abrasion resistance.
Solution Approach 2:
Different regions of the alloy plate have different hardness properties - the base layer is soft for manufacturing while the cladding layer is hard for abrasion resistance. This local differentiation of material properties allows the plate to exhibit both ease of manufacture and high abrasion resistance in appropriate regions.
2Strength
If overlay welding is used to bond high-hardness alloy to soft alloy, then bonding is achieved, but cracks and defects occur during welding and use
Solution Approach 1:
A copper intermediate layer is introduced between the soft base alloy and the hard cladding alloy. This intermediary layer facilitates bonding between the dissimilar metals while reducing welding stresses and preventing cracks, thereby achieving both bonding strength and crack resistance.
Solution Approach 2:
The chemical composition parameters of the base alloy are specifically adjusted (adding Cu: 0.5-3.0 wt%, Si: 0.5-3.0 wt%, Mn: 0.5-3.0 wt%) to improve bonding characteristics and reduce welding defects. These parameter changes enable reliable bonding while maintaining crack resistance.
3Strength
If welding heat treatment is applied to high-hardness alloy, then bonding is achieved, but hardness changes occur leading to cracking or loss of abrasion resistance
Solution Approach 1:
The base alloy is designed with specific compositional characteristics that cushion against harmful welding effects. The copper and silicon content is optimized to suppress carbide precipitation and maintain a stable microstructure during welding, preventing unwanted hardness changes and preserving both bonding strength and abrasion resistance.
4Strength
If a cladding with small hardness difference between layers is used, then impact resistance is improved, but workability deteriorates
Solution Approach 1:
The cladding structure is segmented into a soft base layer and a hard cladding layer with significant hardness difference. The base layer provides workability and serves as a cushion for impact, while the cladding layer provides abrasion resistance, achieving both impact resistance and good workability through functional segmentation.
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 solution provides a cladding with high abrasion resistance and workability, suitable for severe environments, reducing manufacturing costs and processing time, while maintaining strength at the bonding interface.
Implementation Method 1
bonding a first alloy and a second alloy by explosive welding
Implementation Method 2
subjecting the bonded second alloy to quenching and tempering heat treatment to harden the second alloy
Implementation Method 3
subjecting the bonded second alloy to quenching and tempering heat treatment to harden the second alloy
Implementation Method 4
subjecting the bonded second alloy to solution treatment and an aging heat treatment to harden the second alloy
Implementation Method 5
subjecting the bonded second alloy to solution treatment and an aging heat treatment to harden the second alloy
Data Source
AI summary
Cladding in which at least two layers of alloys are joined, the cladding having high wear resistance, high workability, and excellent strength at the joining interface of the alloys. The cladding is composed of two or more layers including a first alloy and a second alloy joined to the first alloy. The hardness of the second alloy of the cladding is greater than that of the first alloy, and the difference in hardness between the first alloy and the second alloy is at least HRC 44. When a shearing test based on JIS G 0601 is performed on the cladding, the breakage is on the first alloy side.