The effect of the heat treatment on the structure and properties of sintered TiC-Ti-Ni, TiC-Ni-Fe alloys
DOI:
https://doi.org/10.15587/1729-4061.2014.27564Keywords:
powder alloy, titanium carbide, sintering, phase composition, brittleness, indentationAbstract
The features of heat treatment effect on the phase composition and crack resistance of sintered tool metastable-bunch alloys, hardened with TiC, were considered in the paper. Due to the fact that one of the major failure mechanisms of the tool, for the manufacture of which these alloys (forming rolls, bandages) were designed, is the crack network formation, the problem of decreasing brittleness of materials is of great scientific and practical value. Alloys with compositions 23 % Ti-27 % Ni and 39 % Ti-11 % Ni (+50 % TiC); as well as 19 % Ni+46 % Fe (+35 % TiC); 10%Ni+40 % Fe (+50 % TiC) and 40 % i+10 % Fe (+50 % TiC) were considered. Crack resistance indicators of alloys along the length of the radial crack from hardness indentations in the as-sintered and as-annealed condition at t=800...1100ºC were defined. It was shown that the reduction in crack resistance parameters provokes annealing at t=800..1000 ºC for the alloy 19 % Ni+46 % Fe (+35 % TiC), t=800 ºC, 900 ºC and 1100 ºC for 40 % Ni+10 % Fe (+50 % TiC), 1100 °C – 10 % Ni+40 % Fe (+50 % TiC), respectively. This condition is accompanied by the presence of intermetallic compounds in the microstructure. The data obtained allow to recommend the use of alloys in the as-sintered condition, and avoid prolonged exposure of embrittlement temperatures during operation of products from them.
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