Precipitation, microstructure and mechanical properties of low nickel maraging steel

Wei Sha, Qing Li, Eric Wilson

    Research output: Contribution to journalArticle

    3 Citations (Scopus)


    A maraging steel with a composition of Fe–12·94Ni–1·61Al–1·01Mo–0·23Nb (wt-%) was investigated. Optical, scanning electron and transmission electron microscopy and X-ray diffraction analysis were employed to study the microstructure of the steel after different aging periods at temperatures of 450–600°C. Hardness and Charpy impact toughness of the steel were measured. The study of microstructure and mechanical properties showed that nanosized precipitates were formed homogeneously during the aging process, which resulted in high hardness. As the aging time is prolonged, precipitates grow and hardness increases. Fractography of the as forged steel has shown mixed ductile and brittle fracture and has indicated that the steel has good toughness. Relationships among heat treatment, microstructure and mechanical properties are discussed. Further experiments using tensile testing and impact testing for aged steel were carried out.
    Original languageEnglish
    Pages (from-to)983-989
    Number of pages7
    JournalMaterials Science And Technology
    Issue number6
    Publication statusPublished - Jun 2011


    • Mechanical properties
    • Steel
    • Aging
    • Fracture
    • Heat treatment
    • Phase transformations

    ASJC Scopus subject areas

    • Materials Science(all)
    • Condensed Matter Physics
    • Mechanical Engineering
    • Mechanics of Materials

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