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- W1977014986 abstract "Along with increasing W and Mo contents in Cr-W-Mo-V high alloy medium-upper carbon steels, the maximal hardness of secondary hardening during tempering is increasing gradually and arrives to 66.8HRC, and the congruent quenching temperature and the tempering temperature corresponding to maximal hardness are ascending. The quenching microstructure of experimental steels is matrix and a small quantity of undissolved carbides when the hardness is maximal, wich is corresponding to tempering temperature of remnant austenitic decomposing acutely. The precipitation of M 6 C and MC carbides was detected, and M 7 C 3 and M 3 C carbides was detected too. But M 23 C 6 carbide did not appear and M 2 C carbide was detected undistinguishably. The temperature range of tempering maximal hardness is 500°C-550°C, and an exact temperature is opposite to the mass fraction ratio of equilibrium carbide phases at the temperature. The tempering hardness value can be obtained from H S = a(1+b)/(0.0127a+0.00297), in which a is square root of saturation level of the carbon in the matrix and b is correction factor having something to do with alloy elements of carbide precipitation." @default.
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- W1977014986 date "2011-12-01" @default.
- W1977014986 modified "2023-09-23" @default.
- W1977014986 title "Secondary Hardening during Tempering of Cr-W-Mo-V High Alloy Medium-Upper Carbon Steel and its Hardness Forecast" @default.
- W1977014986 cites W1987107129 @default.
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- W1977014986 doi "https://doi.org/10.4028/www.scientific.net/amr.415-417.813" @default.
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