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Effects of alloying elements on fracture toughness in the transition temperature region of base metals and simulated heat-affected zones of Mn-Mo-Ni low-alloy steels

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Abstract

This study is concerned with the effects of alloying elements on fracture toughness in the transition temperature region of base metals and heat-affected zones (HAZs) of Mn-Mo-Ni low-alloy steels. Three kinds of steels whose compositions were varied from the composition specification of SA 508 steel (grade 3) were fabricated by vacuum-induction melting and heat treatment, and their fracture toughness was examined using an ASTM E1921 standard test method. In the steels that have decreased C and increased Mo and Ni content, the number of fine M2C carbides was greatly increased and the number of coarse M3C carbides was decreased, thereby leading to the simultaneous improvement of tensile properties and fracture toughness. Brittle martensite-austenite (M-A) constituents were also formed in these steels during cooling, but did not deteriorate fracture toughness because they were decomposed to ferrite and fine carbides after tempering. Their simulated HAZs also had sufficient impact toughness after postweld heat treatment. These findings indicated that the reduction in C content to inhibit the formation of coarse cementite and to improve toughness and the increase in Mo and Ni to prevent the reduction in hardenability and to precipitate fine M2C carbides were useful ways to improve simultaneously the tensile and fracture properties of the HAZs as well as the base metals.

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Authors and Affiliations

  1. Plate Research Group, the Technical Research Laboratories, POSCO, 790-785, Pohang, Korea

    Sangho Kim (Researcher)

  2. Sheet Product & Process Research Group, the Technical Research Laboratories, POSCO, 790-785, Pohang, Korea

    Young-Roc Im (Researcher)

  3. Center for Advanced Aerospace Materials, Pohang University of Science and Technology, 790-784, Pohang, Korea

    Sunghak Lee (Professor)

  4. Materials Science and Engineering, Pohang University of Science and Technology, Korea

    Sunghak Lee (Professor)

  5. the School of Materials Science and Engineering, Seoul National University, 151-742, Seoul, Korea

    Hu-Chul Lee (Professor)

  6. the Materials Processing Department, Korea Institute of Machinery and Materials, 641-010, Changwon, Korea

    Sung-Joon Kim (Principal Research Engineer)

  7. the Nuclear Material Technology Development Division, Korea Atomic Energy Research Institute, 305-600, Daejeon, Korea

    Jun Hwa Hong (Director)

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  1. Sangho Kim
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  2. Young-Roc Im
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  3. Sunghak Lee
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  4. Hu-Chul Lee
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  5. Sung-Joon Kim
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  6. Jun Hwa Hong
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Kim, S., Im, YR., Lee, S. et al. Effects of alloying elements on fracture toughness in the transition temperature region of base metals and simulated heat-affected zones of Mn-Mo-Ni low-alloy steels. Metall Mater Trans A 35, 2027–2037 (2004). https://doi.org/10.1007/s11661-004-0151-3

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  • DOI: https://doi.org/10.1007/s11661-004-0151-3

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