Skip to main content
SpringerLink
Log in

Factors determining the modulus of rupture of biphase ferritic-martensitic steels

  • New Materials and Resource-Saving Methods of Heat And Chemicothermal Treatment—The Basis For Increasing the Reliability and Life of Machine Parts and Tools
  • Published:
Metal Science and Heat Treatment Aims and scope

Conclusions

  1. 1.

    An increase of the modulus of rupture of BFMS under dynamic loading can be attained by reducing the strength of martensite (its carbon content) and comminuting its sections, which is achieved by reducing the concentration of carbon in the steel, by hardening at a higher temperature of the biphase region, and by preparing the corresponding initial structure.

  2. 2.

    Comminution of the ferrite grain in BFMS and reduction of the distortions of the α-lattice by interstitial atoms by reducing the cooling rate, the introduction of carbonitride forming elements, or the use of concluding low tempering (200–250°C) make it possible, with greater strength of the BFMS, to ensure better fracture characteristics than in steels with the same composition but with ferritic-pearlitic structure.

  3. 3.

    A characteristic trait of BFMS is the predominant crack development in one of the phases: the sections of ductile failure on the surface of impact test specimens tested in the range of the brittle-ductile transition belong basically to the martensitic phase; the fatigue crack, especially in the region of small ΔK, develops predominantly in the ferritic matrix.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Log in via an institution

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Similar content being viewed by others

Literature cited

  1. S. A. Golovanenko and N. M. Fonshtein, Biphase Low Alloy Steels [in Russian], Metallurgiya, Moscow (1986).

    Google Scholar 

  2. C. R. Magee and R. G. Davies, "Automotive sheet steels for the 80s," in: Alloys of 80s, Proc. of It. Symp. IMS-AIME, Paper 3, Ann Arbor (1980), p. 142.

  3. B. G. Sazonov, "The effect of secondary quenching from the intercritical range on the disposition of steel to reversible brittleness," Metalloved. Term. Obrab. Met., No. 4, 30–34 (1957).

    Google Scholar 

  4. A. M. Polyakova and V. D. Sadovskii, "‘Intercritical’ hardening of structural steels," Metalloved. Term. Obrab. Met., No. 1, 5–8 (1970).

    Google Scholar 

  5. V. G. Laz'ko, V. E. Laz'ko, and B. M. Ovsyannikov, "Deformation resistance and modulus of rupture of structural steels heat-treated from the intercritical temperature range," Izd. Akad. Nauk SSSR, Met., No. 1, 136–143 (1981).

    Google Scholar 

  6. A. G. Vasil'eva, T. V. Gulyaeva, and B. G. Sazonov, "The effect of the initial structure and heating rate on the properties of steel after hardening from the intercritical range," Metalloved. Term. Obrab. Met., No. 5, 52–55 (1981).

    Google Scholar 

  7. A. N. Bortsov and N. M. Fonshtein, "Distribution of deformations among the phases of ferritic-martensitic steels," Fiz. Met. Metalloved.,61, No. 2, 289–296 (1986).

    Google Scholar 

  8. A. S. Shein and T. A. Lebedev, "The structure and impact toughness of steel hardened from the critical interval," in: Heat Treatment of Metals, [in Russian], Mashgiz, Moscow, pp. 166–177.

  9. N. M. Fonshtein, "Heat treatment for obtaining the stipulated ferritic-martensitic structure of steel," Metalloved. Term. Obrab. Met., No. 8, 46–50 (1985).

    Google Scholar 

  10. B. M. Bronfin, N. M. Fonshtein, S. A. Istomin, et al., "Dispersion strengthening and resistance to brittle failure of low alloy steels with vanadium," Izv. Akad. Nauk SSSR, Met., No. 5, 164–170 (1982).

    Google Scholar 

  11. E. Hornbogen, "Microstructure and mechanisms of fracture, in: Strength of Metals and Alloys, 6th Proc. Int. Conf. Vol. 3, Melbourne (1982), pp. 1059–1073.

  12. N. T. Shich, "The relation of microstructure and fracture properties of electron beam melted modified SAE 4620 steels," Met. Trans.,5, No. 5, 1069–1085 (1974).

    Google Scholar 

  13. B. M. Bronfin, A. A. Emel'yanov, A. Z. Shifman, et al., "Special traits of the microstructure and properties of low alloy steel with increased manganese content hardened from the intercritical temperature range," Izv. Akad. Nauk SSSR, Met., No. 5, 113–119 (1984).

    Google Scholar 

  14. A. N. Tkach, N. M. Fonshtein, V. N. Simin'kovich, et al., "Fatigue crack growth in biphase ferritic-martensitic steel," Fiz.-Khim. Mekh. Mater.,20, No. 5, 45–51 (1984).

    Google Scholar 

Download references

Authors
  1. N. M. Fonshtein
    View author publications

    You can also search for this author in PubMed Google Scholar

Additional information

I. P. Bardin Central Research Institute of Ferrous Metallurgy. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 10, pp. 9–13, October, 1987.

Rights and permissions

Reprints and permissions

About this article

Cite this article

Fonshtein, N.M. Factors determining the modulus of rupture of biphase ferritic-martensitic steels. Met Sci Heat Treat 29, 725–730 (1987). https://doi.org/10.1007/BF00707728

Download citation

  • Issue Date:

  • DOI: https://doi.org/10.1007/BF00707728

Keywords

Search

Navigation