The Influence of Grain Boundary Fracture on Fragmentation Behaviour. Part 2
MATERIALS RESEARCH LABS ASCOT VALE (AUSTRALIA)
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The effect of grain boundary sulphide precipitation on fragmentation performance has been investigated for low alloy steel cylinders tempered at selected temperatures within the range 150 C to 550 C. It was found that, as expected, increased cylinder hardness generally increased the fineness of cylinder fragmentation for both specially heat-treated cylinders with sulphide precipitates present at grain boundaries, as well as standard untreated cylinders. Over the range of tempering temperatures used, the specially treated cylinders, however, showed generally finer fragmentation as measured by a 15 to 30 increase in the Length Normalized Payman Fragmentation Parameter measured for these cylinders. Both fractographic and metallographic evidence indicated that the presence of grain boundary sulphide precipitation assisted in cylinder breakup for steel of the type tested.
- Physical Chemistry
- Properties of Metals and Alloys