Sintering of H13 tool steel?

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Raghd Muhi Al-Deen Jassim

The expansion of samples during the densification of H13 alloy prepared by binder jetting is a result of the sintering process.

Sintering is a high-temperature process that is used to bond particles together to form a solid mass. During sintering, the particles in the H13 alloy undergo several changes that can cause the sample to expand:

Particle rearrangement: As the H13 alloy particles are heated, they begin to rearrange themselves to reduce the amount of empty space between them. This rearrangement can cause the sample to expand as the particles move closer together.

Surface area reduction: As the H13 alloy particles are heated, they begin to fuse together at their contact points. This fusion can cause the total surface area of the particles to decrease, which can result in an expansion of the sample.

Pore closure: As the H13 alloy particles are heated, any pores or voids in the sample can begin to close up as the particles fuse together. This pore closure can cause the sample to expand as the volume of the sample is reduced.

Overall, the expansion of samples during the densification of H13 alloy prepared by binder jetting is a common phenomenon that occurs during the sintering process. This expansion can be controlled by adjusting the sintering conditions, such as temperature and heating rate, to achieve the desired level of densification without excessive expansion.

Febin Cherian John

Yes, there could be multiple factors contributing to the expansion of samples during the densification process of H13 alloy prepared by binder jetting. Some possible factors are:

Thermal expansion: During the sintering process, the metal particles are heated to high temperatures, which can cause them to expand due to thermal expansion. This can lead to an increase in the volume of the sample.

Formation of oxides: The presence of oxygen in the sintering atmosphere or the surface oxidation of the metal powder particles can cause the formation of oxides. The formation of oxides can increase the volume of the sample and contribute to the expansion.

Pore closure: During the densification process, the powder particles are compressed, and the pores between them are closed. This can cause an increase in the density and volume of the sample.

Decomposition of the binder: The binder used in the binder jetting process may undergo decomposition during the sintering process. This can lead to the release of gases, which can cause the expansion of the sample.

Incomplete densification: If the sintering process is not performed properly, it may not result in complete densification of the sample. Incomplete densification can cause the formation of voids or cracks, which can increase the volume of the sample.