Some Problems on the Practical Use of a 3.5 GPa Grade Maraging Steel

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  • Yin Zhong da
    Harbin Institute of Technology, Harbin
  • Suto Hajime
    Department of Materials Science, Faculty of Engineering, Tohoku University

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  • 3.5 GPa級マルエージング鋼実用上の二，三の問題
  • 3 5GPaキュウ マルエージング コウ ジツヨウジョウ ノ ニ サン ノ モ

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Abstract

In a previous paper, it was reported that the Miharisin’s 3.5 GPa grade maraging steel (8%Ni-14%Mo-18%Co-bal. Fe) had excellent fatigue strength, when it was prepared by a special basic melting and was subjected to thermomechanical treatments followed by cold rolling. In the present work, some problems on the practical use of this steel, that is, mechanical anisotropy, hydrogen embrittlement and the strength of welded joint were examined. The results are as follows:<BR>The typical texture as a BCC metal was developed by cold rolling, but the mechanical anisotropy was not so distinct. The conventionally heat treated steel is very sensitive to hydrogen embrittlement, but the cold rolling before age-hardening was effective to mitigate the embrittlement. Electron beam welding reduced the tensile strength from 3.5 GPa to 3.0 GPa, but it is recommended as an available welding process for this steel. The structures of weld metal and heat affected zones were observed by means of transmission electron microscopy.

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