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Fracture behavior in medium-carbon martensitic Si- and Ni-steels

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Abstract

A study of fracture behavior in medium-carbon martensitic Ni- and Si-steels has been made. Charpy impact testing was conducted in order to investigate fracture mode as a function of test temperature. Whereas the transgranular cleavage fracture becomes the primary brittle fracture mode with decreasing test temperature in the Si-steel, intergranular fracture is the only brittle fracture mode observed at low temperatures in the Ni-steel. The different fracture behavior between these steels appears to be due to variation in intrinsic matrix toughness. Since Si may impair the intrinsic matrix toughness, the occurrence of transgranular cleavage fracture becomes relatively easy with decreasing test temperature. On the other hand, since Ni may improve considerably the intrinsic matrix toughness, the transgranular cleavage fracture is not able to occur although the test temperature decreases. Thus, the intrinsic matrix toughness can play a significant role in controlling the fracture behavior.

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Authors and Affiliations

  1. Department of Metallurgical Engineering, Kookmin University, 861-1, Jeongneung-Dong, Seongbuk-Ku, 132, Seoul, Korea

    Hoon Kwon (Assistant Professor)

  2. Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), Cheongryang, P.O. Box 131, 131, Seoul, Korea

    Chong Hee Kim (Professor)

Authors
  1. Hoon Kwon
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  2. Chong Hee Kim
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Kwon, H., Kim, C.H. Fracture behavior in medium-carbon martensitic Si- and Ni-steels. Metall Trans A 17, 1173–1178 (1986). https://doi.org/10.1007/BF02665316

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