Low temper embrittlement and brittle-to-ductile transition in 0.2 mass% carbon steels

Masaki Tanaka, Hayato Yasui, Kenji Higashida

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    2 Citations (Scopus)

    Abstract

    Low temperature temper embrittlement of low carbon steels was investigated. 0.2 mass % carbon steels with fully martensitic structure were employed. The specimen was tempered at 473 K, 623 K and 873 K for 7.2 ks. Impact absorbed energy tested at room temperature shows the lowest value for the specimen tempered at 623 K while the value of Vickers hardness decreases with the increasing in the temperature tempered. Temperature dependence of impact absorbed energy was also measured, exhibiting the brittle-to-ductile transition temperature was highest in the specimen tempered at 623 K, which is low temperature temper embrittlement. Inter-granular fracture was observed in the specimens tempered at 623 K and 873 K, which indicates that tempering at not less than 623 K tends to increase the BDT temperature due to the inter-granular fracture. The temperature dependence of yield stress was also measured, showing that the athermal stress in the specimen tempered at 873 K was drastically decreased, which tends to decrease the BDT temperature. These opposite temperature dependences against BDT temperature induce the low temper embrittlment.

    Original languageEnglish
    Pages (from-to)340-346
    Number of pages7
    JournalTetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan
    Volume102
    Issue number6
    DOIs
    Publication statusPublished - Jan 1 2016

    All Science Journal Classification (ASJC) codes

    • Condensed Matter Physics
    • Physical and Theoretical Chemistry
    • Metals and Alloys
    • Materials Chemistry

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