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Composite White Iron

Duablock® Bi-Metallic White Iron

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Overview

Duablock is a composite material used in mining applications experiencing severe wear. This product consists of a white iron casting bonded to a backing plate. Duablock’s wear resistant microstructure, along with its impact absorbing backing plate, makes it perfect for high abrasion and high impact applications.

Manufacture

The Duablock casting is produced by Bradken’s in-house foundries where an automated moulding machine allows for high volume, low-cost manufacturing. A heat treatment process is used to create a metallurgical bond between the casting and mild steel backing plate, whilst maximising its wear and impact resistance.

Composition

The Duablock cast material belongs to the high chromium abrasion-resistant cast iron alloys designated by Australian Standard – AS 2027–2007. The major alloying elements, chromium, carbon and molybdenum, give this material its superior abrasion and impact resistant properties. A typical chemical composition is given below:

Carbon 2.9%–3.4%
Silicon 0.3%–1.0%
Manganese 0.5%–1.2%
Chromium 14.0%–18.0%
Molybdenum 1.5%–3.0%
Microstructure

The microstructure of Duablock is crucial in providing superior wear performance. The heat treatment cycle transforms the softer as-cast microstructure into hard, wear resistant material. This microstructure consists of a network of interconnected eutectic M7C3 carbides in a martensitic matrix.

Bulk Hardness 650–750 HV50
Carbide Hardness ≥1200 HV0.5
Volume Fraction of Carbides 25%–30%
Density 7500 kg/m3
Duablock Manufacturing Process
Duablock Manufacturing Process
Duablock Microstructure
Duablock Microstructure
Duablock Lined Chute
Duablock Lined Chute

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