Isothermal transformation of austenite under high pressure

Kuteliya, É. R.; Pankratova, Liliia; Éstrin, É. I.

doi:10.1007/bf00652719

Cited by 4 publications

(3 citation statements)

References 2 publications

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“…Most studies have been evaluating very high pressures; 20–42 kbar. Kuteliya et al studied the effect of 20 kbar hydrostatic pressure on austenite transformation and saw that high pressure slows down the transformation of austenite [8]. In a study made by Radcliffe et al [9] it was shown that both the initiation and the rate of austenite transformation in iron-carbon alloys are retarded at 42 kbar, relative to the reactions at 1 atm.…”

Section: Introductionmentioning

confidence: 99%

Phase transformation under isostatic pressure in HIP

et al. 2017

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The new HIP cooling systems enable very fast cooling rates under isostatic pressure. This does not only enable shorter HIP cycles but also allows complete heat treatment cycles to be performed in one HIP cycle. It has been shown in previous studies that extreme pressures of several thousand bar can push phase transformation towards longer times. The new URQ HIP cooling systems give the opportunity to investigate the impact of pressures up to 2000 bar on phase transformation time dependency. For each of the two materials in this study, a comparison of austenite phase transformation time at 100 and 1700 bar was performed. The study was performed by isothermal heat treatment of specimens for a specific time followed by quenching. To evaluate the influence of pressure on hardenability, the phase fractions were evaluated using grid method on SEM images. The study found significant influence of HIP pressure on hardenability.

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Section: Introductionmentioning

confidence: 99%

Phase transformation under isostatic pressure in HIP

et al. 2017

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“…The shift in the transformation lines that was measured in the GPa range was linearly interpolated to a shift in the transformation lines under HIP pressures of 200 MPa. The resulting shifts in the transformation time are 1.5, 22 2, 24 7, 21 and 40 times 23 longer. The large differences in the determined shifts show that there is still need for research in this field.…”

Section: Introductionmentioning

confidence: 97%

“…Several studies deal with this subject. 16,[21][22][23][24][25] Pure Fe-C alloys have been examined as well as commercially available low-alloyed steels. Isothermal time-temperature-transformation (TTT) diagrams have been investigated at different pressures and compared to TTT diagrams that were measured under atmospheric pressure.…”

Section: Introductionmentioning

confidence: 99%

Densifying and hardening of martensitic steel powders in HIP units providing high cooling rates

2016

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Hot isostatic pressing (HIP) units are worldwide used for the compaction of metal alloy powders. The cooling rate in a HIP unit is usually comparatively low. This lengthens cycle times and requires an additionally heat treatment for quenched and tempered steels. Novel cooling HIP concepts in HIP units feature high quenching rates. In this study, tool steels were investigated with respect to their time-temperature-transformation behaviour for different cooling parameters. The paper shows that encapsuled powdered tool steels can be compacted and hardened in the HIP unit. The examined steels exhibit a comparable or even a higher hardness and a finer microstructure. HIP units with high-quenching rates enable to compact and heat treat materials in one step.

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