Effect of thermomechanical treatment on the structure of high-speed steel R6M5

Egorov, Yu. P.; Khazanov, I. O.; Root, Ronald

doi:10.1007/bf00795683

Cited by 1 publication

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“…Therefore, the actual quenching time should be slower than the estimated time. 27 After the quenching, the ingots were then ground into powder and subsequently hot-pressed at 100 MPa at 773 K for 1 h. Electrical heaters supplied heat in the hot pressing machine. The hot pressing condition used was based on an optimized condition for this material obtained in our previous work.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…We found blankets of vapors wrapping around the quartz tube especially in liquid nitrogen quenching, which should inhibit heat transfer between the liquid nitrogen and the sample. Therefore, the actual quenching time should be slower than the estimated time . After the quenching, the ingots were then ground into powder and subsequently hot-pressed at 100 MPa at 773 K for 1 h. Electrical heaters supplied heat in the hot pressing machine.…”

Section: Resultsmentioning

confidence: 99%

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High Thermoelectric Performance of a Heterogeneous PbTe Nanocomposite

et al. 2015

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In this paper, we propose a heterogeneous material for bulk thermoelectrics. By varying the quenching time of Na doped PbTe, followed by hot pressing, we synthesized heterogeneous nanocomposites, a mixture of nanodot nanocomposites and nanograined nanocomposites. It is well-known that by putting excess amounts of Na (i.e., exceeding the solubility limit) into PbTe, nanodots with sizes as small as a few nanometers can be formed. Nanograined regions with an average grain size of ca. 10 nm are observed only in materials synthesized with an extremely low quenching rate, which was achieved by using a quenching media of iced salt water and cold water. Dimensionless thermoelectric figures of merit, zT, of those heterogeneous nanocomposites exhibited a zT around 2.0 at 773 K, which is a 25% increase compared to zT of a homogeneous nanodot nanocomposite with the largest quenching time in our experiment, i.e. furnace cooled. The power factor increase is 5%, and the thermal conductivity reduction is 15%; thus, zT increase mainly comes from the thermal conductivity reduction.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%