(Mo, Ni)硼化物系硬質合金の諸特性に及ぼすCr添加量の影響

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書誌事項

タイトル別名
  • Effect of Cr Content on Properties of (Mo, Ni) Boride Base Hard Alloys
  • Mo Ni ホウカブツケイ コウシツ ゴウキン ノ ショ トクセイ ニ オヨボ
公開日
1993
DOI
  • 10.2320/jinstmet1952.57.7_813
公開者
公益社団法人 日本金属学会

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説明

Effects of Cr on the mechanical properties, corrosion and wear resistances, and phase formation of Mo2NiB2 base hard alloys were studied using the alloys whose compositions were Ni-6 mass%B-58.6 mass%Mo-(0-15)mass%Cr. The alloys consist of a Mo2NiB2 type ternary boride as a hard phase and a nickel base binder alloyed with Cr and Mo, both of which are formed by reaction boronizing sintering.<BR>The transverse-rupture strength (TRS) of the alloys depended strongly on the microstructure, which varied significantly with Cr content. The maximum TRS of 2.3 GPa and a hardness of 87 RA was obtained at 10 mass%Cr content. The structure of the boride phase changes from the orthorhombic M3B2 (M: Metal) to the tetragonal M3B2 with increasing Cr content. The highest TRS value obtained at 10 mass%Cr was attributed to the formation of fine M3B2 with tetragonal structure.<BR>The corrosion resistance of the alloys in a 10 mass%HF and a 10 mass%HCl solutions was superior to the corrosion resistance of a WC-10 mass%Co cemented carbide, PM high speed steel, stainless steels such as JIS SUS405, 440C, 316L and 304 and a tool steel JIS SKD11, but close to that of Hastelloy C. Moreover, in a 10 mass%HNO3 solution, Cr-containing alloys also showed good corrosion resistance with increasing Cr content.<BR>Abrasive and sliding wear resistances of the alloys were better than those of PM high speed steel, stainless steels and SKD11, and comparable to that of cemented carbide.

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 57 (7), 813-820, 1993

    公益社団法人 日本金属学会

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