Conclusions
The regression equations suggested make it possible to determine chromium and iron concentration and also their ratio in carbide precipitate in relation to content of carbon, chromium, and nickel in the steel taking account of tempering duration. On the basis of these equations the process of carbide formation has been analyzed in Cr-Ni-Mo-V-steels.
Nomograms have been plotted making it possible to determine the amount and type of carbide phase in Cr-Ni-Mo-V-steel structures in relation to carbon and chromium concentration.
Sections have been plotted for quaternary diagrams making it possible to determine the change in type of carbide phase in Cr-Ni-Mo-V-steels in relation to content in the steel of carbon, chromium, and nickel, and also tempering duration at 640°C for a time of 1–100 h.
Quaternary diagrams make it possible to expand markedly ideas about processes of carbide formation in steels taking account of varying chemical composition and the time factor. This gives the possibility of approaching reality without simplified recommendations with respect to alloying and heat treatment.
Currently work is being carried out for calculating regression equations which will make it possible to connect the amount and type of carbide phase, chromium concentration in the matrix with melt content of carbon, chromium, nickel, and vanadium in a steel, and also with the temperature and duration of tempering, i.e. we are talking about obtaining data for plotting sections of six-part diagrams. However, obtaining these equations is connected with considerable difficulties since in practice there are no data in the literature for the chemical composition and type of carbide phases in Cr-Ni-Mo-V-steels.
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Additional information
Scientific Production Association, Central Scientific-Research Institute of Machine Building Technology (TsNIITMASh). Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 9, pp. 30–33, September, 1990.
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Borisov, I.A. Effect of carbon, chromium, and nickel on carbide transformation in Cr-Ni-Mo-V-steels during tempering. Met Sci Heat Treat 32, 677–682 (1990). https://doi.org/10.1007/BF00693336
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DOI: https://doi.org/10.1007/BF00693336