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您的检索式：作者名="LEE Wanjun"
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| 1 | Nature of large (Ti, Nb)(C, N) particles precipitated during the solidification of Ti, Nb HSLA steel显示文摘To investigate the microsegregation phenomena and complex (Ti, Nb)(C, N) precipitation behavior during continuous casting, a unidirectional solidification unit was employed to simulate the solidification process. The samples of Ti, Nb-addition steels after unidirectional solidification were examined using field emission scanning electron microscope (FE-SEM) and electron probe X-ray microanalyzer (EPMA). In such specimens, dendrite structure and mushy zone can be detected along the solidification direction. It shows that the addition of titanium, niobium to high-strength low-alloyed (HSLA) steel results in undesirable (Ti, Nb)(C, N) precipita- tion because of microsegregation. The effect of cooling rate on (Ti, Nb)(C, N) precipitation was investigated. The composition of large precipitates was determined using FE-SEM with EDS. Large (Ti, Nb)(C, N) precipitates could be divided into three kinds according to the composition and morphology. With the cooling rate increasing, Ti-rich (Ti, Nb)(C, N) precipitates are transformed to Nb-rich (Ti, Nb)(C, N) precipitates. | Xiaojun Zhuo Xinhua Wang Wanjun Wang Hae-Geon Lee | 2007 | Journal of University of Science and Technology Beijing2007，14，2： | 6 |
| 2 | Thermodynamic calculations and experiments on inclusions to be nucleation sites for intragranular ferrite in Si-Mn-Ti deoxidized steel显示文摘Microstructures and inclusions in the Si-Mn-Ti deoxidized steels after cooling in the furnace were investigated. The compo- sition and morphology of the inclusions were analyzed using a field emission scanning electron microscope (FE-SEM) with energy dispersive X-ray spectrometry (EDS). The kind and composition of the inclusions calculated from the thermodynamic database were in good agreement with the experimental results. There were two main kinds of inclusions formed in the Si-Mn-Ti deoxidized steels. One kind of inclusion was the manganese titanium oxide (Mn-Ti oxide). Another kind of inclusion was the MnS inclusion with segregation points containing Ti and N. According to the thermodynamic calculation, those segregation points were TiN precipitates. The formation of intragranular ferrite (IGF) microstructures refined the grain size during the austenite-ferrite transformation. The mechanisms of IGF formation were discussed. Mn-Ti oxide inclusions with Mn-depleted zone (MDZ) were effective to be nucleation sites for IGF forma- tion, because the MDZ increased the austenite-ferrite transformation temperature. TiN had the low misfit ratio with IGF, so the TiN precipitated on the MnS surface also promoted the formation of IGF because of decreasing interfacial energies. | Xiaojun Zhuo Xinhua Wang Wanjun Wang Lee Hae-Geon | 2007 | Journal of University of Science and Technology Beijing2007，14，1： | 5 |
| 3 | 水溶性抗氧化剂迷迭香酸在大豆油中溶解特性研究显示文摘水溶性抗氧化剂迷迭香酸在油脂煎炸过程中具有优良的抗氧化效果,但其在油脂中的溶解特性却鲜有研究。研究了20、25、30、35、40、45℃下,迷迭香酸在大豆油中的溶解度,利用Apelblat模型和阿伦尼乌斯方程对其溶解过程进行拟合,并分析其溶解过程中的热力学特性。结果表明:在测定的温度范围内,温度越高迷迭香酸的溶解度越高。通过Apelblat模型和阿伦尼乌斯方程计算得到的溶解度理论值与实验得到的实际值具有良好的一致性。基于此对其热力学特性进行分析发现,在测定的温度范围内,迷迭香酸在大豆油中的溶解是非自发吸热且熵值增加的过程。该溶解特性研究为迷迭香酸乃至其他水溶性抗氧化剂在油脂抗氧化应用方面奠定了理论基础。 | 李鹏娟 LEE Wanjun TAN Chinping 李颖 汪勇 | 2020 | 中国油脂2020，45，5： | 2 |
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