Conclusions
-
1.
Annealing of high-speed steel in an atmosphere of protective gas obtained by partial combustion of kerosene and purification from CO2 and H2O prevents surface decarburization and scaling.
-
2.
The suggested atmosphere prevents decarburization on heating up to 900°C.
-
3.
The suggested heat treating schedule in a controlled atmosphere is particularly valuable in the manufacture of thin high-speed steel wire.
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Abbreviations
- σB :
-
tensile strength, kg/sq mm
- σS :
-
yield stress (strength); proof stress in a general way
- σ0.01, σ0.1, σ0.2, etc.:
-
proof stress at 0.01, 0.1, 0.2%, etc. offset
- σP :
-
proportional limit, kg/sq mm
- δ:
-
elongation, %
- δ10 :
-
elongation in 10 diams., %
- ψ:
-
reduction of area, %
- HB :
-
Brinell hardness, BHN.
- RC :
-
Rockwell C hardness
- HV :
-
Vickers hardness, DPN
- Sk :
-
true fracture strength (in tension)
- ak :
-
impact toughness, kgm/sq cm
References
A. A. Shmykov and B. V. Malyshev, Controlled Atmospheres, [Book] (Kontroliruemye Atmosf.) Mashgiz, 1953.
A. V. Smirnov and I. V. Beloruchev, Oxidation and Decarburization of Steel during Heat Treatment Processes [Book], (Okislenie i Obezuglerozh. Stali v Prots. Term. Obrab.), Metallurgizdat, 1934.
Additional information
Central Iron and Steel Research Institute
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Teimer, D.A., Petrenko, A.G. & Kurtova, L.A. Prevention of decarburization in the annealing of high-speed steel. Met Sci Heat Treat 2, 269–272 (1960). https://doi.org/10.1007/BF00649667
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DOI: https://doi.org/10.1007/BF00649667