Weld Overlay Plate
Duaplate® D80
Overview
Duaplate® D80 is a chromium carbide weld overlay used in the Fixed Plant industry. The manufacturing process of Duaplate®, along with the microstructure and chemical composition, give D80 its superior properties. D80 performs well under very high impact and very severe abrasive environments. Large sheets or custom shapes of Duaplate® D80 are available and can be formed into complex shapes.
Duaplate® D80 Weld Overlay
The D80 overlay material is a complex chromium carbide weld overlay that is based on AS2576-2455. The microstructure of this material consists of primary M7C3 carbides in a complex carbide austenite matrix. The toughness of the material is improved by the formation of nodular complex carbides leading to a reduction in the size of acicular M7C3 type carbides and inter-carbide spacing.
Manufacture
Duaplate® is manufactured by welding an abrasion resistant material to a mild steel base. A chromium rich powder is fused to the base plate, creating a bi-metallic material with high abrasion resistance whilst still retaining ductility allowing forming and welding. Multiple overlay and backing plate thickness options are available.
Composition
Extra alloying elements help to give Duaplate® D80 its superior properties. Typical chemical composition is given below:
Carbon
3.0% – 4.5%
Silicon
0.8% – 2.5%
Manganese
1.5% – 3.2%
Chromium
25%–35%
Nb/Mo/Ti/V/W
Up to 5%
Iron
Balance
Microstructure
A D80 microstructure consists of fine, primary M7C3 carbides surrounded by a eutectic mixture of carbides and austenitic matrix material. The very hard primary carbides form as hexagonal nodules and help to prevent wear of the hardfacing material whilst providing superior impact resistance than Duaplate D60. The austenitic matrix material provides mechanical support to the primary carbides whilst also helping to absorb impact.
Bulk Hardness
620–680 HV50
Carbide Hardness
1100–1600 HV0.3
Volume Fraction of Carbides
~30%
Density
7850 kg/m3
Used on :
- Bin & Hopper Liners
- Chute Liners
- Deflector Plates
- Vibrating Feeders
- Mobile Equipment
- Grizzly bars
Duaplate® D80 Weld Overlay
Duaplate® D80 Weld Overlay Manufacturing Process
Duaplate® D80 Weld Overlay Microstructure
