Effects of Graphite Addition and Sintering Temperature on Strength and Toughness of Sintered Compacts made from Cr-Mn Containing Steel Powder

Shigeru Unami, Osamu Furukimi

    Research output: Contribution to journalArticlepeer-review

    12 Citations (Scopus)

    Abstract

    Effects of graphite addition and sintering temperature on tensile strength of sintered compacts made from 1%Cr-0.7%Mn-0.3%Mo steel powder have been investigated. A sintered compact with 0.9% graphite addition gives the maximum strength of 760MPa at the process condition of compacting pressure of 690MPa and sintering temperature of 1523K. The major factors controlling tensile strength of 1%Cr-0.7%Mn-0.3%Mo sintered compact have been proved to be sintered density, contents of carbon and MnO⋅Cr2O3 spinet inclusions and amount of cementite precipitated in grain boundaries. The decrease of tensile strength of the sintered compact with 1.2% graphite addition is caused by precipitation of cementite in grain boundaries. The tensile strength lowers with the increase of sintering temperature from 1423K to 1473K because of the decrease of carbon content. The tensile strength increases with the increase of sintering temperature from 1473K to 1523K because of the reduction of MnO⋅Cr2O3 spinel oxide.

    Original languageEnglish
    Pages (from-to)630-636
    Number of pages7
    JournalJournal of the Japan Society of Powder and Powder Metallurgy
    Volume40
    Issue number6
    DOIs
    Publication statusPublished - 1993

    All Science Journal Classification (ASJC) codes

    • Mechanical Engineering
    • Industrial and Manufacturing Engineering
    • Metals and Alloys
    • Materials Chemistry

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