Conclusions
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1.
Raising the carbon content of steels produced by DHP to 0.8% increases their hardenability. The hardenability of hypereutectoid steels is less, which may be attributed to their marked structural hetero-geneity and the presence of a large amount of stable carbides.
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2.
In the annealed condition, the hardenability of P/M steels is less than that of conventional grades because steels produced by DHP are less prone to grain growth and are characterized by greater hetero-geneity and higher oxide contents.
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3.
Lowering the temperature of DHP reduces the extent of thermomechanical strengthening and consequently decreases hardenability.
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4.
Steels produced from iron powders containing manganese and silicon surpass in hardenability, in spite of their high oxide contents, manganese-free steels.
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5.
teels produced from coarser iron powders show greater heterogeneity and lower hardenability.
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Literature cited
Yu. G. Dorofeev, N. T. Zherditskii, et al., Poroshkovaya Met., No. 2, 94 (1972).
Yu. G. Dorofeev, N. T. Zherditskii, et al., Tekhnol. i Organizatsiya Proizv., No. 2 (1972).
G. I. Aksenov and R. Zabbarov, Poroshkovaya Met., No. 11, 30 (1968).
G. W. Cull, Powder Met.,13, No. 26, 156 (1970).
K. Z. Sheplyakovskii, Yu. Ya. Postnikov, et al., Metal, i Term. Obrabotki Metal., No. 9, 2 (1972).
M. E. Blanter, Phase Transformations in the Heat Treatment of Steel [in Russian], Metallurgiya, Moscow (1962).
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Translated from Poroshkovaya Metallurgiya, No. 9 (129), pp. 10–15, September, 1973.