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| 1 | Formation mechanism of large grains inside annealed microstructure of GH4169 superalloy by cellular automation method显示文摘In authors’ previous work [Mater. Charact. 141 (2018) 212-222]. it was found that the heterogeneous deformed microstructures can be replaced by the relatively homogeneous recrystallized grains through an annealing treatment. However, there are still some relatively large recrystallized grains. To find the reasons for the formation of large grains, some new annealing treatment tests were done, and the cellular automation (CA) simulations were carried out in the present work. The experimental results showed that the microstructural evolution during annealing treatment is significantly affected by the content of S phase. So. the effects of δ phase on the nucleation and growth of grains are carefully considered in the CA model to accurately simulate the microstructural evolution behavior. By the CA simulation, it is found that the dislocation density rapidly decreases due to the nucleation of static recrystallization (SRX) and the growth of dynamc recrystallization (DRX) nuclei at the early stage of annealing. The high initial dislocation density provide the high velocity for the growth of DRX nuclei, which is responsible for the formation of coarse grains, However, the growth rate of SRX nuclei is relatively small due to the low dislocation density and pinning effects of δ phase. | Ming-Song Chen Zong-Huai Zou Y.C.Lin Hong-Bin Li Guan-Qiang Wang | 2019 | Journal of Materials Science & Technology2019，35，7： | 7 |
| 2 | Methods and mechanisms for uniformly refining deformed mixed and coarse grains inside a solution-treated Ni-based superalloy by two-stage heat treatment显示文摘The uniform refinement mechanisms and methods of deformed mixed and coarse grains inside a solution-treatment Ni-based superalloy during two-stage annealing treatment have been investigated.The two-stage heat treatment experiments include an aging annealing treatment(AT)and a subsequent recrystallization annealing treatment(RT).The object of AT is to precipitate someδphases and consume part of storage energy to inhibit the grain growth during RT,while the RT is to refine mixed and coarse grains by recrystallization.It can be found that the recrystallization grains will quickly grow up to a large size when the AT time is too low or the RT temperature is too high,while the deformed coarse grains cannot be eliminated when the AT time is too long or the RT temperature is too low.In addition,the mixed microstructure composed of some abnormal coarse recrystallization grains(ACRGs)and a large number of fine grains can be observed in the annealed specimen when the AT time is 3 h and RT temperature is 980℃.The phenomenon attributes to the uneven distribution ofδphase resulted from the heterogeneous deformation energy when the AT time is too short.In the regions with a large number ofδphases,the recrystallization nucleation rate is promoted and the growth of grains is limited,which results in fine grains.However,in the regions with fewδphases,the recrystallization grains around grain boundaries can easily grow up,and the new recrystallization nucleus is difficult to form inside grain,which leads to ACRGs.Thus,in order to obtain uniform and fine annealed microstructure,it is a prerequisite to precipitate even-distributedδphase by choosing a suitable AT time,such as 12 h.Moreover,a relative high RT temperature is also needed to promote the recrystallization nucleation aroundδphase.The optimal annealing parameters range for uniformly refining mixed crystal can be summarized as:900℃×12 h+990℃×(40-60 min)and 900℃×12 h+1000℃×(10-15 min). | Guan-Qiang Wang Ming-Song Chen Hong-Bin Li Y.C.Lin Wei-Dong Zeng Yan-Yong Ma | 2021 | Journal of Materials Science & Technology2021，，18： | 7 |
| 3 | The dynamic responses of lamellar and equiaxed nearβ-Ti alloys subjected to multi-pass cross rolling显示文摘This work gives a comparison on the microstructural characteristics,textural discrepancies,and twinning behaviors of lamellar and equiaxed nearβ-Ti alloys during multi-pass cross rolling with a rolling reduction of 20%,50%and 80%.The results showed that the restoration mechanism of the alloy inβphase is strongly dependent on theαmorphologies,and in comparison,strain path has weaker influences on the grain refinement of theβmatrix.Therefore,the texture intensities of bothαandβphases were weakened owing to the dynamic recrystallization(DRX)of the two phases in the equiaxed microstructure.While,with regard to the lamellar microstructure,dynamic recovery(DRV)of theβphase predominated,forming elongatedβsubgrains.Besides,theαandβmatrix in lamellar microstructures obeyed the Burgers orientation relationship,which was gradually broken down until the final reduction.Lastly,the{1101}twinning exhibits a strong size effect.With the continuous DRX ofαphases,theα-twinning is suppressed owing to progressive grain refinement.The activation ofβ-twinning,namely{332}?113?and{112}?111?,in nearβ-Ti alloys is heavily dependent on the deficientβ-stabilizing elements and the local stress concentration.These findings provide an effective way to obtain ultra-fine grain microstructures of this alloy. | Wei Chen Hande Wang Y.C.Lin Xiaoyong Zhang Chao Chen Yaping Lv Kechao Zhou | 2020 | Journal of Materials Science & Technology2020，36，8： | 3 |
| 4 | 查看详情显示文摘 | D.A.Weitz Y.C.Lin C.P.Broedersz | | 0，，： | 1 |
| 5 | Space-time coded MIMO ZPOFDM systems:Semiblind channel estimation and equalization显示文摘 | J.L.Yu Y.C.Lin | | 0，，07： | 1 |
| 6 | 添加剂对喷雾干燥钼粉的粉末性能和压制性能的影响显示文摘聚合物粘结剂,如PVA,通常添加到钼粉中,以便在喷雾干燥后,能生产出具有较好流动性的大球形颗拉料。既然这些粘结剂有助于减少粉末之间及粉末与模壁间的摩擦力,就有必要添加一种润滑剂,如EBS,以便于压制。本文研究了EBS对表观密度、流动速率、压坯单重偏差、压坯密度、压坯强度和压缩性的影响。结果表明,当流动性、尺寸控制和低的脱模力达到要求时,EBS添加剂的最佳含量应当介于0.1%与0.2%之间。当要求高的压坯密度、压坯强度和压缩性时,就无需加入润滑剂。 | H.S.Huang Y.C.Lin K.S.Hwang 李学芳 佘建芳 | 2003 | 国外难熔金属与硬质材料2003，19，1： | 1 |
| 7 | Compact ultrawideband rectangular aperture antenna and band-notched designs显示文摘 | Y.C.Lin K.J.Hung | | 0，，： | 1 |
| 8 | Detection of Breaking Waves Using X-Band Pulse Radar in the Nearshore Region显示文摘An X-band pulsed Doppler microwave radar has been used to determine the characteristics of breaking waves. Field experiments were conducted at the Shuang-Si estuary in the north of Taiwan in the winter of 2005. Analyses on maxima radar cross section and Doppler frequency shift are done to characterize wave breaking zones. Based on observations of breaking waves, the wave breaking zones are shown to be located at water depths of 1.8 to 2.2 m in the experimental site. In general, the results indicate that a radar system has the potential to delineate the spatial variation of breaking waves clearly and that this is sufficient to achieve a measurement operation for near-shore air-sea interaction events. | Y.C.Lin C.C.Chang M.C.Lee H.C.Chan J.M.Leu | 2013 | China Ocean Engineering2013，27，4： | 0 |
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