Development of Cu and Ni-Free Sintered Steel with High Strength and High Toughness (Report 1)

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  • Cu，Niフリー高強度高靱性焼結鋼　第1報
  • 平成26年度春季大会 講演特集 粉末冶金プロセスを用いた製造技術と製品評価の新展開 Cu, Niフリー高強度高靱性焼結鋼(第1報)
  • ヘイセイ 26ネンド シュンキ タイカイ コウエン トクシュウ フンマツ ヤキン プロセス オ モチイタ セイゾウ ギジュツ ト セイヒン ヒョウカ ノ シン テンカイ Cu, Ni フリー コウキョウド コウジンセイ ショウケツコウ(ダイ1ポウ)

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In this study, we selected the Mn and Si as strengthening elements for high strength sintered steels to eliminate the Cu and Ni. Improvement of the tensile strength as well as the toughness was investigated in Fe-Mo-Mn-Si-C sintered steels using a Fe-Mn-Si-C master alloyed powder as additives. Developed sintered steels have the dual phase microstructure composed of lower bainite and island shaped martensite, and this microstructure realizes the high tensile strength and impact value more than 950 MPa and 48 J/cm2 respectively at the density of 7.4 g/cm3.

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