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Sintering atmosphere influence on the mechanical properties of the alloy TZM

Sintering heat treatment or the powder compact at a temperature below the melting point temperature of the main component, the purpose is to produce a metallurgical bond between the powder particles, even if the transition between the powder particles by mechanical engagement into the grain boundary bonding between atoms. Sintering atmosphere had little effect on the mechanical properties of the alloy TZM now be analyzed from the following three aspects:

1. The influence of hardness

Hardness depends on the size of the porosity. TZM alloy due to the influence of different porosity on small sintering atmosphere sintering atmosphere thus TZM alloy on the effects of different hardness is not obvious.

2. The impact tensile stiffness

The level of tensile strength and pore number, shape, size and distribution have a relationship. However, at the same ingredients, mixing process and under the same sintering temperature and time of sintering atmosphere on the number of pores of different shape, size and distribution of the impact is not very obvious.

3. Impact Toughness

Impact toughness strongly depends on the plastic material, thereby plastically like as strongly dependent on the porosity. Number depends on the porosity of the sintering temperature and time, at the same sintering temperature and sintering time, the effects of different porosity of TZM alloy sintering atmosphere is not obvious, so little change in sintered density. Therefore, the density is not the main cause little impact toughness.

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