Abstract
(α + γ) two phase stainless steel (Fe-21%Cr-4.8%Ni-1.5%Mo) powder was processed by high pressure torsion (HPT) and consolidation at room temperature. The received powder had fully α single phase due to the rapid cooling during gas atomizing process. Specimens after HPT process were heat treated at 1173K for 3.6ks. It was revealed that the decomposition of α phase to γ took place during the heat treatment. Detailed microstructure observation showed that an equiaxed (α + γ) micro-duplex structure was developed and its average grain size was approximately 3.2 micrometers. The same heat treatment given to the material without HPT resulted in a coarse two phase microstructure.Therefore, it is considered that an ultra fine grained microstructure was caused by increasing of nucleation sites for γ phase due to severe plastic deformation (SPD) of HPT process. Electron backscatter diffraction patterns (EBSD) analysis indicated that α phase has a {110}/ND strong texture, that is, the α phase seems to have single orientated coarse grain structure. The γ precipitates indicated a {111}/ND strong texture, and the crystallographic orientation relationship of Kurdjumov-Sachs was observed.
| Original language | English |
|---|---|
| Title of host publication | THERMEC 2016 |
| Publisher | Trans Tech Publications Ltd |
| Pages | 1365-1368 |
| Number of pages | 4 |
| Volume | 879 |
| ISBN (Print) | 9783035711295 |
| DOIs | |
| Publication status | Published - 2017 |
| Event | 9th International Conference on Processing and Manufacturing of Advanced Materials, THERMEC 2016 - Graz, Austria Duration: May 29 2016 → Jun 3 2016 |
Publication series
| Name | Materials Science Forum |
|---|---|
| Volume | 879 |
| ISSN (Print) | 02555476 |
Other
| Other | 9th International Conference on Processing and Manufacturing of Advanced Materials, THERMEC 2016 |
|---|---|
| Country | Austria |
| City | Graz |
| Period | 5/29/16 → 6/3/16 |
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All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering
Cite this
Microstructure formation of high pressure torsion processed (α + γ) two phase stainless steel. / Ota, Mie; Nanya, Daiki; Vajpai, Sanjay Kumar; Ameyama, Kei; Edalati, Kaveh; Horita, Zenji.
THERMEC 2016. Vol. 879 Trans Tech Publications Ltd, 2017. p. 1365-1368 (Materials Science Forum; Vol. 879).Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
}
TY - GEN
T1 - Microstructure formation of high pressure torsion processed (α + γ) two phase stainless steel
AU - Ota, Mie
AU - Nanya, Daiki
AU - Vajpai, Sanjay Kumar
AU - Ameyama, Kei
AU - Edalati, Kaveh
AU - Horita, Zenji
PY - 2017
Y1 - 2017
N2 - (α + γ) two phase stainless steel (Fe-21%Cr-4.8%Ni-1.5%Mo) powder was processed by high pressure torsion (HPT) and consolidation at room temperature. The received powder had fully α single phase due to the rapid cooling during gas atomizing process. Specimens after HPT process were heat treated at 1173K for 3.6ks. It was revealed that the decomposition of α phase to γ took place during the heat treatment. Detailed microstructure observation showed that an equiaxed (α + γ) micro-duplex structure was developed and its average grain size was approximately 3.2 micrometers. The same heat treatment given to the material without HPT resulted in a coarse two phase microstructure.Therefore, it is considered that an ultra fine grained microstructure was caused by increasing of nucleation sites for γ phase due to severe plastic deformation (SPD) of HPT process. Electron backscatter diffraction patterns (EBSD) analysis indicated that α phase has a {110}/ND strong texture, that is, the α phase seems to have single orientated coarse grain structure. The γ precipitates indicated a {111}/ND strong texture, and the crystallographic orientation relationship of Kurdjumov-Sachs was observed.
AB - (α + γ) two phase stainless steel (Fe-21%Cr-4.8%Ni-1.5%Mo) powder was processed by high pressure torsion (HPT) and consolidation at room temperature. The received powder had fully α single phase due to the rapid cooling during gas atomizing process. Specimens after HPT process were heat treated at 1173K for 3.6ks. It was revealed that the decomposition of α phase to γ took place during the heat treatment. Detailed microstructure observation showed that an equiaxed (α + γ) micro-duplex structure was developed and its average grain size was approximately 3.2 micrometers. The same heat treatment given to the material without HPT resulted in a coarse two phase microstructure.Therefore, it is considered that an ultra fine grained microstructure was caused by increasing of nucleation sites for γ phase due to severe plastic deformation (SPD) of HPT process. Electron backscatter diffraction patterns (EBSD) analysis indicated that α phase has a {110}/ND strong texture, that is, the α phase seems to have single orientated coarse grain structure. The γ precipitates indicated a {111}/ND strong texture, and the crystallographic orientation relationship of Kurdjumov-Sachs was observed.
UR - http://www.scopus.com/inward/record.url?scp=85000538688&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85000538688&partnerID=8YFLogxK
U2 - 10.4028/www.scientific.net/MSF.879.1365
DO - 10.4028/www.scientific.net/MSF.879.1365
M3 - Conference contribution
AN - SCOPUS:85000538688
SN - 9783035711295
VL - 879
T3 - Materials Science Forum
SP - 1365
EP - 1368
BT - THERMEC 2016
PB - Trans Tech Publications Ltd
ER -