Effects of Aging Conditions and Strain Rate on Rupture Elongation of 13Ni-15Co-10Mo-0.2Ti (280kg/mm<SUP>2</SUP>-Grade) Maraging Steels

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  • 13Ni-15Co-10Mo-0.2Ti (280kg/mmmm<SUP>2</SUP>級) 系マルエージ鋼の延性に及ぼす時効条件と歪速度の影響
  • 13Ni-15Co-10Mo-0.2Ti(280kg/〓級)系マルエージ鋼の延性に及ぼす時効条件と歪速度の影響
  • 13Ni 15Co 10Mo 0 2Ti 280kg キュウ ケイ マルエージ

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Abstract

Tensile strength and elongation have been measured in aged 13Ni-15Co-10Mo-0.2Ti, 14Ni-10Co-10Mo and 14Ni-15Co-7Mo maraging steels. The temperature range in aging has been varied from 450°C to 575°C for the 13Ni-15Co-10Mo-0.2Ti steel, and from 425°C to 475°C for the 14Ni-10Co-10Mo and 14Ni-15Co-7Mo steels. A cross head speed in a tensile test has been ranged from 1mm/min to 0.005mm/min. The effect of strain rate on tensile elongation has been investigated in relation to aging temperature and time.<BR>In tensile tests of the maraging steels in which fine coherent precipitates are considered to be formed, it is observed that tensile elongation is decreased with decreasing a strain rate. The elongation decrease in a low strain rate is also observed in tensile tests of the 13Ni-15Co-10Mo-0.2Ti steel in which coarse precipitates are contained by over-aging. It is considered that the elongation decrease in a low strain rate is attributed to both stress concentrations resulting from plastic deformation characteristics of the aged maraging steels and hydrogen diffused to regions having intense stress concentrations.

Journal

  • Tetsu-to-Hagane

    Tetsu-to-Hagane 65 (6), 665-673, 1979

    The Iron and Steel Institute of Japan

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