Ti(C,N)-30Mo2C-13Ni-合金の諸特性に及ぼすN/(C+N)比の影響

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The microstructural features and mechanical, thermal and cutting properties of Ti(C, N)-30Mo2C-13Ni alloys were investigated in relation to the N/(C+N) ratio. The results obtained are as follows: (1) The growth rate of (Ti, Mo) (C, N) phase formed around Ti(C, N) core particles decreased with an increase of N/(C+N) ratio. (2) Hardness of sintered alloy decreased, while transverse rupture strength remained unchanged with an increase of N/(C+N) ratio. 0.002% offset yield stress in compressive test increased, however, plastic strain and Young's modulus decreased with an increase of N/(C+N) ratio. (3) Thermal expansion coefficient and thermal conductivity increased with the rise of N/(C+N) ratio. Thermal shock resistance calculated from the equation of R=(ρσB/δE) increased with the rise of N/(C+N) ratio of the alloy. (4) Flank wear resistance of Ti(C, N)-30Mo2C-13Ni alloy in continuous cutting steel decreased, whereas the crater wear resistance increased with the rise of N/(C+N) ratio of the alloy. Resistance against mechanical and thermal shock of the above alloy in intermittent cutting of steel increased with the rise of N/(C+N) ratio. The alloy with N/(C+N) ratio of 0.297 was found to be the most excellent alloy in wear and shock resistance in cutting of steel.
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