Abrasion behavior of high Cr-V-Nb cast iron

Masanori Hirose, Kaoru Yamamoto, Hirofumi Miyahara, Kazunori Sakata, Keisaku Ogi

    研究成果: 書籍/レポート タイプへの寄稿会議への寄与

    2 被引用数 (Scopus)

    抄録

    A series of abrasion tests on high Cr-V-Nb cast irons revealed that the addition of MC type carbide formers, V and Nb, remarkably enhances the abrasion resistance of high Cr cast iron, and the abrasion resistance becomes higher with the increase in MC type carbides [1]. Therefore, hyper eutectic Fe-4.7%C-15%Cr-7%V-5%Nb-5%Mo alloy melt was poured into 30kg and 1kg sand mold castings to distribute different sizes of primary and eutectic carbides in hardenable matrix. The abrasion test specimens cut from each casting were austenitized at 1323K for 1h then cooled in air. These specimens were tempered at 773K for 1h followed by air cooling. The hardness of specimens was 1015-1018HV50. The rubber wheel abrasion test, a typical 3 body type one, was performed on these quenched and tempered specimens with 56-107, 107-150 and 297 μm dia. silica grit. The testing load was 86.3N and 172.5N, and the rubber wheel rotation speed was varied from 1s-1 to 4s-1. Though the higher testing load increases the wear loss, the wear rate expressed by the wear volume/(testing load × wear distance) changes depending on the wear condition and the microstructure. In case of 30kg cast specimen, the silica grit preferentially attack and scrape off the matrix, and the wear rate increases with the increase in the testing load. The fine carbides in 1kg cast specimens effectively protect the matrix from the attack of silica grit, and the wear rate decreases with increasing load which causes silica grit blunt and fracture. However, fine carbides tend to be fractured by silica grit and diminish the protective effect. Based on the worn surface structures, the abrasion mechanism is discussed comparing those of steel and eutectic 25%Cr cast iron.

    本文言語英語
    ホスト出版物のタイトルScience and Processing of Cast Iron IX
    出版社Trans Tech Publications Ltd
    ページ243-248
    ページ数6
    ISBN(印刷版)9780878492275
    DOI
    出版ステータス出版済み - 2011
    イベント9th International Symposium on Science and Processing of Cast Iron, SPCI-9 - Luxor, エジプト
    継続期間: 11月 10 201011月 13 2010

    出版物シリーズ

    名前Key Engineering Materials
    457
    ISSN(印刷版)1013-9826
    ISSN(電子版)1662-9795

    その他

    その他9th International Symposium on Science and Processing of Cast Iron, SPCI-9
    国/地域エジプト
    CityLuxor
    Period11/10/1011/13/10

    !!!All Science Journal Classification (ASJC) codes

    • 材料科学一般
    • 材料力学
    • 機械工学

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