Al添加したNi-Cr-Mo-B系ガスアトマイズ粉末の時効硬化挙動

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  • Effect of Al Addition to Ni-Cr-Mo-B Gas Atomized Powder on Age Hardening
  • Al テンカ シタ Ni-Cr-Mo-Bケイ ガスアトマイズ フンマツ ノ ジコウ コウカ キョドウ

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<p>The effects of Al addition to Ni-Cr-Mo-B alloy with corrosion and wear resistance on age hardening behavior were investigated. Examined compositions were Ni-22 mass% Cr-23 mass% Mo-1 mass% B without Al and with 2, 3 and 4 mass% Al. The powders with these compositions were produced by gas atomization, followed by sieving under 150 μm in particle size. Then, solution treatment was carried out at 1473 K for 7.2 ks in vacuum. Also, aging treatment at 1073 K for 14.4 ks in vacuum was carried out after the solution treatment. Both of cooling conditions after these heat treatments were air cooling. As a result, two kinds of hardening phenomena were observed. One was the hardness increase with increase of Al addition of more than 3 mass% after solution treatment by formation of Mo rich intermetallic compound. The other was age hardenability by precipitation of fine aging precipitate by Al addition of more than 2 mass%.</p>

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