Conclusions
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1.
Steels 42KhMFA and 40KhMFA have practically the same static and fatigue strengths (σb, σ−1) as well as resistance to ductile and brittle fracture, differing only in hardenability, depth of the nitrided case, and character of the change in hardness.
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2.
For crankshafts of the YaMZ-238 engine the molybdenum content of steel 42KhMFA can be reduced to 0.2–0.3%. In this case, however, the chromium content should be raised to 1.2–1.5%, which makes it possible to obtain the necessary hardness of the nitrided case (≥HV 600 at the surface and ≥HV 500 at a depth of 0.2 mm) with gas nitriding for 18–20 h. This change in the composition of the steel will reduce the consumption of scarce molybdenum.
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Literature cited
V. V. Skotnikov, V. V. Krasikov, and A. N. Belov, "Selection of steel and nitriding method to improve the reliability and service life of crankshafts for automobile diesel engines at the Yarsolavl' Motor Factory," in: Heat and Chemicothermal Treatment in Machine Construction (Reports of Scientific-Technical Symposium) [in Russian], Saratov (1978).
Additional information
Yaroslavl' Motor Factory. I. P. Bardin Central Scientific-Research Institute of Ferrous Metallurgy. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 6, pp. 28–31, June, 1980.
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Skotnikov, V.V., Krasikov, V.V., Zikeev, V.N. et al. Effect of chromium and molybdenum concentrations on the properties of steel 42KhMFA. Met Sci Heat Treat 22, 414–417 (1980). https://doi.org/10.1007/BF00693645
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DOI: https://doi.org/10.1007/BF00693645