Conclusions
-
1.
A high rate of formation of a biphase boride coating (80–90μ) was attained in the first hour of boriding steel 40Kh in a mixture of 80% B+16% Na2B4O7+4% KBF4.
-
2.
The boride coatings obtained in this mixture with holding for 2–6 h are even and dense with no peeling and low brittleness, due to the use of relatively low processing temperatures.
-
3.
Reducing the percentage of FeB phase in the coating reduces the probability of cracking.
-
4.
The powdered mixture of 80% B+16% Na2B4O7+4% KBF4 is suitable for production and can be recommended for boriding steels.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
Literature cited
L. S. Lyakhovich and L. G. Voroshnin, Boriding of Steel [in Russian], Metallurgiya, Moscow (1967), pp. 12, 31, 61.
V. P. Glukhov, Boride Coatings on Iron and Steels [in Russian], Naukova Dumka, Kiev (1970).
V. A. Nadol'skii and V. I. Ivinskii, "Boriding in powders with additions of KBF4," Metalloved. Term. Obrab. Met., No. 11, 63 (1972).
M. Rile, "Reasons for cracks in boride coatings on steels," Metalloved. Term. Obrab. Met., No. 10, 20 (1974).
B. V. Babushkin and B. Z. Polyakov, "Residual stresses in steel after saturation with boron from melts," Metalloved. Term. Obrab. Met., No. 7, 28 (1973).
G. V. Samsonov, V. S. Neshpor, and L. M. Khrenova, "Hardness and brittleness of metallic compounds," Fiz. Met. Metalloved.,8, Nos. 3–4, 625 (1959).
Additional information
Perm Branch of the All-Union Scientific-Research Institute of the Drilling Industry. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 11, pp. 72–75, November, 1978.
Rights and permissions
About this article
Cite this article
Koskov, V.D. Diffusion boriding of steel 40Kh in a powered mixture with high activity. Met Sci Heat Treat 20, 960–963 (1978). https://doi.org/10.1007/BF00713771
Issue Date:
DOI: https://doi.org/10.1007/BF00713771