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The fracture behavior of 8Mn steel at −196°C has been investigated by a comparison with that of 9Ni steel. 8Mn steel fails by a mixture of cleavage and intergranular fracture, in contrast to 9Ni steel, which shows cleavage fracture when impact tested at −196°C. This shows that intergranular fracture in 8Mn steel is not due to the segregation of solutes, including Mn, reducing the grain boundary strength,...
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