{"id":807,"date":"2020-08-24T16:55:06","date_gmt":"2020-08-24T16:55:06","guid":{"rendered":"https:\/\/metalcast.com.mx\/?p=807"},"modified":"2020-09-14T14:36:27","modified_gmt":"2020-09-14T14:36:27","slug":"cementacion-tratamiento-termoquimico","status":"publish","type":"post","link":"https:\/\/metalcast.com.mx\/en\/2020\/08\/24\/cementacion-tratamiento-termoquimico\/","title":{"rendered":"CEMENTATION (THERMOCHEMICAL TREATMENT)"},"content":{"rendered":"
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Cementation is a thermochemical treatment that consists of carburizing a surface layer of a steel part, surrounding it with a fuel product and heating it to a suitable temperature by means of diffusion, modifying its composition, impregnating the surface and then subjecting it to a heat treatment, quenching and tempering, leaving the part with good tenacity in the core and with great surface hardness.<\/p>

The objective of the hardening is that in the hardening of the steel it provides hardness to the piece, but also fragility. On the contrary, if the material is not hardened, it will not be hard enough and will wear out. In order to preserve the best qualities of both cases, case-hardening is used, which hardens<\/p>

the surface of the part without modification of the core, thus giving rise to a part formed by two materials, that of the core made of low carbon steel, tough and resistant to fatigue, and the surface part made of steel with a higher concentration of carbon, harder, resistant to wear and<\/p>

deformations, being all of them a single compact piece.<\/p>

It consists of coating the parts to be cemented with a material rich in carbon, called cementitious material, and subjecting it to high temperatures of 900 \u00b0C for several hours. In these conditions is when the carbon has greater capacity of dissolution, that will be penetrating in the surface that covers at the rate of 0.1 to 0.2 millimeters per hour of treatment. Once absorbed by the peripheral layer of the steel, the process of diffusion of the carbon towards the interior of the piece begins (the thickness of the cemented layer depends on the temperature and the time that the operation lasts). The part thus obtained is given the corresponding heat treatment, of hardening and tempering, and each of the two areas of the part will acquire the qualities that correspond to its percentage of carbon. Sometimes two tempering processes are carried out, one homogeneous to the whole piece and a second tempering process that hardens the external part.<\/p>

The cementation finds application in all those pieces that have to possess great resistance to the shock and tenacity together with a great resistance to the wear, as it is the case of the pinions, cams, axles, etc.<\/p>

We can differentiate three types of cementitious materials:<\/p>