ON TEMPERED MICROSTRUCTURE AND PROPERTIES OF 11.73Ni-13.85Co-3.13Cr STEEL

Ling Bin;Zhong Ping;Zhong Bingwen;Zhao Zhengye;Zhang Shaoqing

Journal of Aeronautical Materials ›› 1995, Vol. 15 ›› Issue (4) : 20-26.

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Journal of Aeronautical Materials ›› 1995, Vol. 15 ›› Issue (4) : 20-26.

ON TEMPERED MICROSTRUCTURE AND PROPERTIES OF 11.73Ni-13.85Co-3.13Cr STEEL

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Abstract

The effect of tempering on the microstructure and mechanical properties of ultrahigh strength11. 73Ni-13.85Co-3.13Cr steel was studied. Upon tempering at 430℃, the martensite decomposed to forma lot of cementite platelets concomitant with a significant drop in toughness. Tempering at 440~455℃ re-sulted in peak strength due to the precipitation of coherent zones of fine carbides. The attainment of peakin toughness is due to absence of cementite and formation of reverted austenite. Tempering at higher tem-peratures resulted in loss of both strength and tonghness. The drop of the strength is due to precipitationscoarsening and loss of the coherency with the matrix.

Key words

ultrahigh strength s / secondary hardening / temper

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Ling Bin, Zhong Ping, Zhong Bingwen, Zhao Zhengye, Zhang Shaoqing. ON TEMPERED MICROSTRUCTURE AND PROPERTIES OF 11.73Ni-13.85Co-3.13Cr STEEL[J]. Journal of Aeronautical Materials, 1995, 15(4): 20-26

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