microwave Sintering Process on Hardness

For the iron-based materials, the composition of the alloy decided to organize, but the organization also determine the performance of the alloy. The relative content of each organization, distribution and morphology can affect the performance of the material. Figure 3 is a conventional microwave sintering and microstructure of sintered samples. From the figure it can be observed in tissue samples by conventional sintered ferrite, pearlite, martensite and pore composition, and organization of a large number of microwave sintering martensite and pearlite. Resulting in the presence of two kinds of differences in the organization this reason sintering methods, mainly due to the microwave absorption of microwave sintering the material directly into heat so as to achieve the purpose of sintering,.

After the close of the microwave source, low-alloy steel microwave sintering cooling fast, up to 45 ℃ / min, close to the quenching rate, so (b) microstructure can be seen in a large number of martensite from Figure 3 while the conventional hydrogen furnace is heated by thermal conduction, when the power is turned off, there is a lot of waste heat in the furnace chamber, the sample is cooled together with the furnace, cooling slowly, so the main room temperature microstructure of ferrite. Sintering under the two different ways, low alloy steel main factors influence the hardness of the martensite content is, under microwave conditions for rapid cooling after sintering, in a large organization martensite, which has a high hardness.

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