Details
| Original language | English |
|---|---|
| Article number | 219 |
| Number of pages | 10 |
| Journal | MATERIALS |
| Volume | 14 |
| Issue number | 1 |
| Publication status | Published - 5 Jan 2021 |
Abstract
The present work deals with adjusting a fine-grained microstructure in iron-rich iron-aluminium alloys using the ECAP-process (Equal Channel Angular Pressing). Due to the limited formability of Fe-Al alloys with increased aluminium content, high forming temperatures and low forming speeds are required. Therefore, tool temperatures above 1100◦C are permanently needed to prevent cooling of the work pieces, which makes the design of the ECAP-process challenging. For the investigation, the Fe-Al work pieces were heated to the respective hot forming temperature in a chamber furnace and then formed in the ECAP tool at a constant punch speed of 5 mm/s. Besides the chemical composition (Fe9Al, Fe28Al and Fe38Al (at.%—Al)), the influences of a subsequent heat treatment and the holding time on the microstructure development were investigated. For this purpose, the average grain size of the microstructure was measured using the AGI (Average Grain Intercept) method and correlated with the aforementioned parameters. The results show that no significant grain refinement could be achieved with the parameters used, which is largely due to the high forming temperature significantly promoting grain growth. The holding times in the examined area do not have any influence on the grain refinement.
Keywords
- Bulk forming, Equal channel angular pressing (ECAP), Hot forming, Iron-aluminium alloys, Microstructure
ASJC Scopus subject areas
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In: MATERIALS, Vol. 14, No. 1, 219, 05.01.2021.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Investigation on the Microstructure of ECAP-Processed Iron-Aluminium Alloys
AU - Behrens, Bernd Arno
AU - Brunotte, Kai
AU - Petersen, Tom
AU - Relge, Roman
N1 - Funding Information: Funding: This research was funded by the German Research Foundation (DFG), grant number No. 142849202.
PY - 2021/1/5
Y1 - 2021/1/5
N2 - The present work deals with adjusting a fine-grained microstructure in iron-rich iron-aluminium alloys using the ECAP-process (Equal Channel Angular Pressing). Due to the limited formability of Fe-Al alloys with increased aluminium content, high forming temperatures and low forming speeds are required. Therefore, tool temperatures above 1100◦C are permanently needed to prevent cooling of the work pieces, which makes the design of the ECAP-process challenging. For the investigation, the Fe-Al work pieces were heated to the respective hot forming temperature in a chamber furnace and then formed in the ECAP tool at a constant punch speed of 5 mm/s. Besides the chemical composition (Fe9Al, Fe28Al and Fe38Al (at.%—Al)), the influences of a subsequent heat treatment and the holding time on the microstructure development were investigated. For this purpose, the average grain size of the microstructure was measured using the AGI (Average Grain Intercept) method and correlated with the aforementioned parameters. The results show that no significant grain refinement could be achieved with the parameters used, which is largely due to the high forming temperature significantly promoting grain growth. The holding times in the examined area do not have any influence on the grain refinement.
AB - The present work deals with adjusting a fine-grained microstructure in iron-rich iron-aluminium alloys using the ECAP-process (Equal Channel Angular Pressing). Due to the limited formability of Fe-Al alloys with increased aluminium content, high forming temperatures and low forming speeds are required. Therefore, tool temperatures above 1100◦C are permanently needed to prevent cooling of the work pieces, which makes the design of the ECAP-process challenging. For the investigation, the Fe-Al work pieces were heated to the respective hot forming temperature in a chamber furnace and then formed in the ECAP tool at a constant punch speed of 5 mm/s. Besides the chemical composition (Fe9Al, Fe28Al and Fe38Al (at.%—Al)), the influences of a subsequent heat treatment and the holding time on the microstructure development were investigated. For this purpose, the average grain size of the microstructure was measured using the AGI (Average Grain Intercept) method and correlated with the aforementioned parameters. The results show that no significant grain refinement could be achieved with the parameters used, which is largely due to the high forming temperature significantly promoting grain growth. The holding times in the examined area do not have any influence on the grain refinement.
KW - Bulk forming
KW - Equal channel angular pressing (ECAP)
KW - Hot forming
KW - Iron-aluminium alloys
KW - Microstructure
UR - http://www.scopus.com/inward/record.url?scp=85098981376&partnerID=8YFLogxK
U2 - 10.3390/ma14010219
DO - 10.3390/ma14010219
M3 - Article
AN - SCOPUS:85098981376
VL - 14
JO - MATERIALS
JF - MATERIALS
SN - 1996-1944
IS - 1
M1 - 219
ER -