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| 1 | Effect of tempering temperature on the microstructure and properties of ultrahigh-strength stainless steel显示文摘The microstructure, precipitation and mechanical properties of Ferrium S53 steel, a secondary hardening ultrahigh-strength stainless steel with 10% Cr developed by QuesTek Innovations LLC, upon tem pering were studied by scanning electron microscopy (SEM), transm ission electron microscopy (TEM), X-ray diffraction (XRD), and tensile and impact tests. Based on these results, the influence of the tem pering temperature on the microstructure and properties was discussed. The results show th at decom position occurred when the retained austenite was tem pered above 440 ℃ and that the hardening peak at 482 ℃ was caused by the joint strengthening of the precipitates and martensite transformation. Due to the high Cr content, the trigonal M7C3 carbide precipitated w hen the steel was tem pered at 400 ℃, and M7C3 and M2C (5 -10 nm in size) coexisted w hen it was tem pered at 482 ℃. When the steel was tem pered at 630 ℃, M2C and M23C6 carbides precipitated, and the sizes w ere greater than 50 nm and 500 nm, respectively, but no M7C3 carbide formed. When the tempering tem perature was above 540 ℃, austenitization and large-size precipitates w ere the main factors affecting the strength and toughness. | Yangpeng Zhang Dongping Zhan Xiwei Qi Zhouhua Jiang | 2019 | Journal of Materials Science & Technology2019，35，7： | 9 |
| 2 | Virtual Photon Effects on Chaos in Generalized Lorenz-Haken Equation显示文摘The dynamics of an ensemble of two-level atoms injected into a single-mode cavity is studied in the exact atom-field interaction situation, in which the counter-rotating terms describing the so-called virtual photon processes neglected in the rotating-wave approximation, are considered. The cavity mode is driven by the injected classical field,and the atom is prepared in a coherent superposition of the two levels. We first derive the generalized Lorenz-Haken equation by using the technique of quantum Langevin equation, and then numerically study the dynamics of this equation.We find that the virtual photon processes have strong effects on the dynamics, which can cause the trajectory in phase space of strange attractor spiral around four focus points, and the trajectory is modulated by virtual photon processes.The chaos region in parameter space is now enlarged. It should be stressed that the strange attractor can exist in optical bistability, and whether the atomic coherences and classical field can inhibit chaos depends on the laser frequency. | JURui HUANGHong-Bin YANGPeng XIEXia ZHAOHuan | 2005 | Communications in Theoretical Physics2005，44，1X： | 1 |
| 3 | Modeling and Simulation Study on Reverse Swirl of Secondary Air in Large Tangetially Fired Boiler 显示文摘 | Li Yangpeng Zhangqing etc | 2000 | Journal of University2000，16，2： | 1 |
| 4 | The effect of pacific cod ( Gadus macrocephalus ) skin gelatin polypeptides on UV radiation-induced skin photoaging in ICR mice显示文摘 | Hu Hou Bafang Li Xue Zhao Yongliang Zhuang Guoyan Ren Mingyan Yan Yangpeng Cai Xiukun Zhang Li Chen | 2009 | Food Chemistry2009，，3： | 1 |
| 5 | Effect of Nanoscale Cu-Riched Clusters on Strength and Impact Toughness in a Tempered Cu-Bearing HSLA Steel显示文摘The effect of Cu-riched clusters on strength and impact toughness in a tempered Cu-bearing high-strength low-alloy(HSLA)steel is investigated. With increasing the tempering temperature, it is found that the yield strength increases firstly, achieving the maximum value(~ 1053 MPa) at the tempering temperature of 450 ℃, and then decreases significantly with the rise of tempering temperature. The tempering temperature-dependent yield strength is closely related to the precipitation of Cu-riched clusters. When tempering at 450 ℃, the peak strength will be reached as the nanoscale Cu-riched clusters with small size and high number density will cause a strong precipitation strengthening(~ 492 MPa) due to the dislocation shearing mechanism. However, the Cu-riched clusters will coarsen with further increasing tempering temperature, resulting in obvious decrement of yield strength owing to the dislocation bypassing mechanism. Compared with the yield strength,the variation in impact energy displays an inverse tendency and the impact energy is only 7 J for the sample tempered at 450 ℃. The fracture mode can be well explained by the competition between the cleavage fracture strength( σ F) and “yield strength”( σ Y). Although transgranular cleavage fracture can be found in samples tempered at 450 and 550 °C, the crack propagation along the lath boundaries is prevented in the sample tempered at 550 ℃. The reason is that the number density of Cu-riched clusters at lath boundaries decreases and the segregation of Mo element at the lath boundaries is induced,which will increase the bonding energy. | Yubin Du Xiaofeng Hu Yuanyuan Song Yangpeng Zhang Lijian Rong | 2022 | Acta Metallurgica Sinica(English Letters)2022，35，4： | 1 |
| 6 | Modeling and Simulation Study on Reverse Swirl of Secondary Air in Large Tangentially Fired Boiler显示文摘 | Li Yangpeng Zhangqing etc | 2000 | Journal of University2000，16，2： | 1 |
| 7 | A robust symbol timing strategy for cellular systems显示文摘In cellular systems,establishing the initial symbol timing of potential preambles is the first step of a cell search.The envelope fluctuation of the downlink signal hinders the successful timing of conventional symbol timing methods.To solve this problem,a hybrid timing strategy is proposed with two novel detectors,namely the normalized replica-based detector and normalized differential detector.The strategy first detects all potential preambles via the normalized replica-based detector and then employs the normalized differential detector to verify the target preamble,which comes from the target cell and has the highest power.The strategy is unaffected by envelope fluctuation and has computational complexity comparable to that of conventional methods.Simu-lations and real-data tests show that the hybrid timing strategy is robust and practical for initial symbol timing. | Yangpeng Dan Jianxin Yi Xianrong Wan Yunhua Rao Yan Liu | 2023 | Digital Communications and Networks2023，9，3： | 0 |
| 8 | THE CLASSIFICATION OF ECOLOGICAL-ECONOMIC BELTS FOR THE SUSTAINABLE AGRICULTURE AND ITS ECOLOGICAL BASIS IN THE SUBTROPICAL MOUNTAIN AREA显示文摘Subtropical region in Southern China has special physical and alagricultural conditions where agro-ecosystem and its spatial pattern were restricted by ecological characteristics of zonal vegetation. The study conduct ecological-economic regionalization of subtropical region in Southern China, designed optimal agro-ecological landscape patterns in different geographic units, which aimed to make u pthe break-up and unbalance of bio-geo-chemical cycle due to simplicity of agro-ecosystem structure. | LiXianglin XinXiaoping YangPeng | 2000 | 中国农业资源与区划2000，21，6： | 0 |
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