Abstract
The fracture characteristics of a powder forged Cr-Mn alloy steel have been evaluated by plane strain fracture toughness tests. The toughness values obtained have been related to the distribution of non-metallic inclusions that result from different thermal and mechanical treatments. A comprehensive study was made of the inclusions. Two basic types were found: coarse inclusions > 10 μm were manganese silicates or alumino-silicates, while fine inclusions (∼1 μm) were oxide spinels or manganese (alumino) silicates. These finer inclusions were found to strongly influence the fracture mode and toughness of the material. It is believed that these coarse and fine inclusions formed at different periods during processing of the powder. Ways to optimize the fracture toughness of these powder forged parts are considered.
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