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| 1 | Yielding behavior of triplex medium Mn steel alternated with cooling strategies altering martensite/ferrite interfacial feature显示文摘In this paper, we report the influence of cooling processes on the yielding behavior of a medium Mn steel(MMS) with triplex microstructure, i.e. austenite(γ), ferrite(α) and as-quenched martensite(α’). After the intercritical annealing(IA) at both 725℃ and 750℃, the steel was subjected to the two cooling processes, i.e. air cooling(AC) and water quenching(WQ). It exhibits the discontinuous yielding after the AC following the IA at 750℃ while the continuous yielding after the WQ. Compared with WQ process,both the dilatometry and the microstructural examinations show that the AC process leads to lower Ms temperature, larger retained austenite(RA) fraction and less martensite, the latter is always companied with geometry necessary dislocations(GNDs) generated near the α/α’ interfaces. Considering the complexity of nanosized tri-phases in this steel, the presence of martensite with key features in the resultant specimens was systematically examined by atom probe tomography(APT) on the samples prepared by the specific target lift-out method. The APT results directly revealed the C/Mn co-segregation at the α’/αinterfaces in the AC samples but not in WQ samples. The numerical simulation results further suggest that the segregation of C and Mn at the α’/α interfaces may be due to different mechanisms. We conclude that the yielding of triplex MMS is determined by both the quantity of GNDs generated near theα/α’ interfaces, which increases with martensite fraction, and the extent of their immobilization resulting from the interfacial segregation of solute atoms when the presence of martensite is sufficient. WQ tends to suppress the discontinuous yielding of MMS since the rapid cooling may promote more martensite formed with the increasing quantity of GNDs and prevent the interfacial segregation of both C and Mn. | Bin Hu Xiao Shen Qinyi Guo Qinghua Wen Xin Tu Cancan Ding Fanglin Ding Wenwen Song Haiwen Luo | 2022 | Journal of Materials Science & Technology2022，，31： | 2 |
| 2 | Novel resonant pole inverter for brushless DC motor drive system 显示文摘 | Pan Zhiyang Luo Fanglin | 2005 | IEEE Transactions on Power Electronics2005，20，1： | 1 |
| 3 | Novel soft switching inverter for brushless DC motor variable speed drive system显示文摘 | PAN Zhiyang LUO Fanglin | 2004 | IEEE Transactions on Power Electronics2004，19，2： | 1 |
| 4 | Switched-inductor Z-source inverter显示文摘 | ZHU Miao YU Kun LUO Fanglin | 2010 | IEEE Transactions on Power Electronics2010，25，8： | 1 |
| 5 | Novel soft switching inverter for brushless DC motor variable speed drive system显示文摘 | PAN Zhiyang LUO Fanglin | 2004 | IEEE Transactions on Power Electronics2004，19，2： | 1 |
| 6 | Novel resonant pole inverter for brushless DC motor drive system显示文摘 | Pan Zhiyang Luo Fanglin | 2005 | IEEE Transactions on Power Electronics2005，20，1： | 1 |
| 7 | Robust and precision motion control system of linear-motor direct drive for high-speed X-Y table positioning mechanism显示文摘 | Liu Zuozong Luo Fanglin Rahman M A | 2005 | IEEE Trans on Industrial Electronics2005，52，5： | 1 |
| 8 | Transformer based resonant DC link inverter for brushless DC motor drive system 显示文摘 | PAN Zhiyang LUO Fanglin | 2005 | IEEE Transactions on Power Electronics2005，20，4： | 1 |
| 9 | Transformer based resonantDC link inverter for brushless DC motor drive system显示文摘 | Pan Zhiyang Luo Fanglin | 2005 | IEEE Trans on Power Electronics2005，20，4： | 1 |
| 10 | Transformer based resonant DC link inverter for brushless DC motor drive system 显示文摘 | PAN Zhiyang LUO Fanglin | 2005 | IEEE Transac- tions on Power Electronics2005，20，4： | 1 |
| 11 | Novel Soft-switching Inverter for Brushless DC Motor Variable Speed Drive System显示文摘 | Pan Zhiyang Luo Fanglin | | 0，，02： | 1 |
| 12 | Novel resonant pole inverter for brushless DC motor drive system显示文摘 | Pan Zhiyang Luo Fanglin | 2005 | IEEE Transactions on Power Electronics2005，20，1： | 1 |
| 13 | Speed nonlinear control of DC motor drive with field weakening显示文摘 | Liu Zuozong Luo Fanglin Rashid M H | 2003 | IEEE Transactions on Industry Applications2003，39，2： | 1 |
| 14 | Transformer based resonant DC link inverter for brushless DC motor drive system显示文摘 | Pan Zhiyang Luo Fanglin | 2005 | IEEE Transactions on Power Electronics2005，20，4： | 1 |
| 15 | Novel soft-switching inverter for brushless DC motor variable speed drive system显示文摘 | Pan Zhiyang Luo Fanglin | 2004 | IEEE Transactions on Power Electronics2004，19，2： | 1 |
| 16 | Transformer based resonant DC link inverter for brushless DC motor drive system显示文摘 | Pan Zhiyang Luo Fanglin | 2005 | IEEE Transactions on PowerElectronics2005，20，4： | 1 |
| 17 | Multiple-page-mapping backpropagationneural network for constant tension control显示文摘 | LUO Fanglin | 1998 | IEEProceedings:Electric Power Applications1998，145，3： | 1 |
| 18 | Novel soft switching inverter for brushless DC motor variable speed drive system显示文摘 | Pan Zhiyang Luo Fanglin | 2004 | IEEE Transactions on Power Electronics2004，19，2： | 1 |
| 19 | Positive output super-lift convert- ers 显示文摘 | Luo Fanglin Ye Hong | 2003 | IEEE Transactions on Power Electronics2003，18，1： | 1 |
| 20 | Transformer based resonant DC link inverter for brushless DC motor drive system显示文摘 | Pan Zhiyang Luo Fanglin | 2005 | IEEE Trans on Power Electronics2005，20，4： | 1 |
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