A Study on the Nanoscale Austenite Stabilized by Q&P Heat Treatment in a Low-alloy Medium-carbon Steel
In this research, the objective was to investigate the stabilized retained austenite in the microstructure resulting from the Q&P heat treatment since the primary goal in Q&P is to create a microstructure consists of stabilized retained austenite and martensite. For this purpose, a...
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| Format: | Article |
| Language: | English |
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Iran University of Science & Technology
2018-09-01
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| Series: | Iranian Journal of Materials Science and Engineering |
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| Online Access: | http://ijmse.iust.ac.ir/browse.php?a_code=A-10-67-2&slc_lang=en&sid=1 |
| _version_ | 1818476225981579264 |
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| author | R. Jafari Sh. Mirdamadi Sh. Kheirandish H. Guim |
| author_facet | R. Jafari Sh. Mirdamadi Sh. Kheirandish H. Guim |
| author_sort | R. Jafari |
| collection | DOAJ |
| description | In this research, the objective was to investigate the stabilized retained austenite in the microstructure resulting from the Q&P heat treatment since the primary goal in Q&P is to create a microstructure consists of stabilized retained austenite and martensite. For this purpose, a low-alloy steel with 0.4wt. % carbon was treated by quench and partitioning (Q&P) process. The Q&P was conducted at different quench temperatures to obtain a considerable amount of retained austenite, while partitioning temperature and time were kept constant. Through analysis of the XRD profiles, volume percent, carbon concentration, and lattice parameters of retained austenite and martensite were calculated. At quench temperature equal to 160°C, 12vol.% austenite was stabilized to the room temperature, which was the highest amount achieved. The microstructural observations carried out on selected samples, revealed that retained austenite has a nanoscale particle size, about 200nm. Distinguishing retained austenite in the SEM micrographs became possible by utilizing SE2 signals via the difference in phases contrast. Two types of morphology, film-like and blocky type, were identified by means of TEM and TKD and a schematic model was proposed in order to explain these morphologies |
| first_indexed | 2024-12-10T09:22:47Z |
| format | Article |
| id | doaj.art-0d95b0f6e54a4b359c79116a7e91f645 |
| institution | Directory Open Access Journal |
| issn | 1735-0808 2383-3882 |
| language | English |
| last_indexed | 2024-12-10T09:22:47Z |
| publishDate | 2018-09-01 |
| publisher | Iran University of Science & Technology |
| record_format | Article |
| series | Iranian Journal of Materials Science and Engineering |
| spelling | doaj.art-0d95b0f6e54a4b359c79116a7e91f6452022-12-22T01:54:38ZengIran University of Science & TechnologyIranian Journal of Materials Science and Engineering1735-08082383-38822018-09-01153111A Study on the Nanoscale Austenite Stabilized by Q&P Heat Treatment in a Low-alloy Medium-carbon SteelR. Jafari0Sh. Mirdamadi1Sh. Kheirandish2H. Guim3 School of Metallurgy & Materials Engineering, Iran University of Science and Technology School of Metallurgy & Materials Engineering, Iran University of Science and Technology School of Metallurgy & Materials Engineering, Iran University of Science and Technology Daejeon, Republic of Korea In this research, the objective was to investigate the stabilized retained austenite in the microstructure resulting from the Q&P heat treatment since the primary goal in Q&P is to create a microstructure consists of stabilized retained austenite and martensite. For this purpose, a low-alloy steel with 0.4wt. % carbon was treated by quench and partitioning (Q&P) process. The Q&P was conducted at different quench temperatures to obtain a considerable amount of retained austenite, while partitioning temperature and time were kept constant. Through analysis of the XRD profiles, volume percent, carbon concentration, and lattice parameters of retained austenite and martensite were calculated. At quench temperature equal to 160°C, 12vol.% austenite was stabilized to the room temperature, which was the highest amount achieved. The microstructural observations carried out on selected samples, revealed that retained austenite has a nanoscale particle size, about 200nm. Distinguishing retained austenite in the SEM micrographs became possible by utilizing SE2 signals via the difference in phases contrast. Two types of morphology, film-like and blocky type, were identified by means of TEM and TKD and a schematic model was proposed in order to explain these morphologieshttp://ijmse.iust.ac.ir/browse.php?a_code=A-10-67-2&slc_lang=en&sid=1Quench and Partitioning Retained austenite nanoscale film-like RA low alloy steel |
| spellingShingle | R. Jafari Sh. Mirdamadi Sh. Kheirandish H. Guim A Study on the Nanoscale Austenite Stabilized by Q&P Heat Treatment in a Low-alloy Medium-carbon Steel Iranian Journal of Materials Science and Engineering Quench and Partitioning Retained austenite nanoscale film-like RA low alloy steel |
| title | A Study on the Nanoscale Austenite Stabilized by Q&P Heat Treatment in a Low-alloy Medium-carbon Steel |
| title_full | A Study on the Nanoscale Austenite Stabilized by Q&P Heat Treatment in a Low-alloy Medium-carbon Steel |
| title_fullStr | A Study on the Nanoscale Austenite Stabilized by Q&P Heat Treatment in a Low-alloy Medium-carbon Steel |
| title_full_unstemmed | A Study on the Nanoscale Austenite Stabilized by Q&P Heat Treatment in a Low-alloy Medium-carbon Steel |
| title_short | A Study on the Nanoscale Austenite Stabilized by Q&P Heat Treatment in a Low-alloy Medium-carbon Steel |
| title_sort | study on the nanoscale austenite stabilized by q p heat treatment in a low alloy medium carbon steel |
| topic | Quench and Partitioning Retained austenite nanoscale film-like RA low alloy steel |
| url | http://ijmse.iust.ac.ir/browse.php?a_code=A-10-67-2&slc_lang=en&sid=1 |
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