Ni-Cr-Mo-B系耐食耐摩耗粉末冶金材の諸特性に及ぼすHIP温度の影響

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  • Effects of HIP Temperature on Properties of Ni-Cr-Mo-B P/M Alloy with High Corrosion and Wear Resistance
  • 平成24年度秋季大会 講演特集 硬質材料に関する研究課題と新たな展開 Ni-Cr-Mo-B系耐食耐摩耗粉末冶金材の諸特性に及ぼすHIP温度の影響
  • ヘイセイ 24ネンド シュウキ タイカイ コウエン トクシュウ コウシツ ザイリョウ ニ カンスル ケンキュウ カダイ ト アラタ ナ テンカイ Ni-Cr-Mo-Bケイ タイショク タイマモウ フンマツ ヤキンザイ ノ ショ トクセイ ニ オヨボス HIP オンド ノ エイキョウ

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The effects of HIP temperature on the properties of Ni-Cr-Mo-B P/M material with Ni-22mass%Cr-26mass%Mo-1.5mass%B composition were investigated. Raw material powders were produced by gas atomization, followed by sieving under 500 μm in particle size. And then, the powders were consolidated by HIP. HIP consolidations were carried out at 1323, 1373 and 1423 K in temperature, at 147 MPa in pressure and for 5 h in holding time. All specimens consisted of γNi matrix and tetragonal M3B2 type complex boride. The complex borides were isolated and coarsened with increase of HIP temperature.<br> Rockwell hardness decreased and bending strength increased with increasing HIP temperature. The variation in Charpy impact value as a function of HIP temperature showed the local maximum at 1373 K. Wear resistance by Ohgoshi-type abrasion test with low sliding speed improved with increasing HIP temperature. The complex borides in the specimen with low HIP temperature were so fine that these were considered to fall off from the sliding surface in the abrasion test.<br> As a result of immersion tests, all examined Ni-Cr-Mo-B P/M materials showed higher corrosion resistance against both HCl and HF aqueous solutions than C-276 alloy.

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