ON THE STRENGTHENING MECHANISM OF HIGH Co-Ni ULTRAHIGH STRENGTH STEEL

Abstract

Abstract: In this paper, the microstructure and strengthening mechanism of 23NiCo steel were studied by transmission electron microscopy and atom-probe field-ion microscopy. The results show that the peak strength obtained when the steel is tempered at 440455℃is due to the precipitation of coherent zones of fine carbides.The peak in toughness attained at the absence of cementite and the formation of reverted and stable austenite.Tempering at higher temperatures resulted in loss of both strength and toughness. The drop of the strength of the steel tempered at high temperature is due to precipitation coarsening and loss of coherence with the matrix.

Key words: ultrahigh strength steel, secondary hardening, tempering

B. Ling; P. Zhong;B. W Zhong; Z. Y Zhao and S.Q. Zhang(Beijing Institute of Aeronautical Materials, Beijing 100095,China Manuscript received 26 August 1996). ON THE STRENGTHENING MECHANISM OF HIGH Co-Ni ULTRAHIGH STRENGTH STEEL[J]. Acta Metallurgica Sinica (English Letters), 1996, 9(6): 647-651.

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ON THE STRENGTHENING MECHANISM OF HIGH Co-Ni ULTRAHIGH STRENGTH STEEL

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