Conclusions
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1.
The static strength and nominal fracture toughness decrease with martensite needles larger than grade 8 and also with insufficient low-temperature tempering after induction hardening.
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2.
The size of martensite needles in induction hardened crankshaft journals should be no higher than grade 8 (GOST 8233-56).
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3.
Induction hardening of crankshaft journals must exclude ferrite inclusions in the hardened layer and overheating, which leads to growth of martensite needles and intergranular fracture.
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4.
Precise low-temperature tempering is required after induction hardening.
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Central Order of Labor of Red Banner Scientific-Research Automobile and Automotive Institute. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 10, pp. 10–13, October, 1978.
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Prokof'eva, I.I., Taratorina, M.V. & Shermazan, I.V. Effect of martensite needle size on the mechanical properties of steel 45 after induction hardening. Met Sci Heat Treat 20, 795–798 (1978). https://doi.org/10.1007/BF00703773
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DOI: https://doi.org/10.1007/BF00703773