Abstract
The effect of variations in the size and distribution of non-metallic inclusions on the fracture behaviour of 2·25 Cr1Mo low alloy steel has been studied by undertaking a programme of disk bend testing at temperatures between 20°C and −196°C. Analysis of load/displacement data in combination with detailed fractographic evaluation indicates that inclusions greater than about 4 μm in diameter significantly increase the susceptibility for the formation of ductile voids. The ease with which ductile voids form then has a direct effect on the load and strain to failure. In contrast, inclusions do not appear to influence behaviour when fracture occurs by cleavage.
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