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41.
研究了电渣熔前后钢中氧及夹杂物的变化。结果表明,用电渣重熔工艺生产同承钢,虽然氧含量比连铸钢高,但其大颗粒夹杂物数量少,尺寸较小,分布均匀,因此疲劳寿命高。 相似文献
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43.
激光熔池中金属的凝固过程由于极端偏离平衡,并伴随有复杂的热量、质量及动量传输过程而变得十分复杂.本文以CO-Cr-C三元合金的γ-Co-Cr7-xCoxC3伪二元截面共晶合金系为对象,系统考察了在激光重熔后凝固组织的形成,探索了其形态选择演绎规律.研究表明,该伪二元截面合金系在激光重熔条件下有一个向碳化物成分方向倾斜的γ-Co与Cr7-xCoxC3共生生长区.并可观察到在足够大的过冷度下发生的非晶转变论文最后运用最高界面温度假设和相应的界面响应函数讨论了该合金系在激光重熔时凝固组织形态选择图并与实验结果作了比较. 相似文献
44.
半固态ZL201合金的重熔加热合金组织 总被引:2,自引:3,他引:2
采用电子显微镜及图像分析仪,系统研究了近液相线铸造ZL201合金在二次加热过程中的组织演变·结果表明:ZL201铝合金半固态坯料在620~630℃保温5~10min,能够获得适用于半固态成形的触变组织,此时,晶粒平均等积圆直径为43 8μm,晶粒平均圆度为1 87·近液相线半连续铸造可以获得理想的ZL201合金半固态坯料· 相似文献
45.
Both the Bowen and Fenner differentiation trends have been recognized in the Emeishan flood basalts.While the Longzhoushan laveas in Panxi paleorift evolved on a trend of silica enrichment (Bowen trend),the lavas from Guizhou evoled along the Fenner trend leading to the magmas with high Fe2O3 (23%) and low SiO2(44%) contents,This provides evidence for the existence of Fe-rich and Si-poor magmas in nature ,Such contrasting differentiation trends,marked by different timing of crystallization of Fe-Ti oxides,are correlated with the extent of crustal contamination of the magmas ,Linited crustal contamination in the Guizhou lavas is coupled with the low oxygen fugacity which delayed the onset of magnetite crystallization .In contrast,significant involvement of crustal components in the Long-Zhoushan lavas increased fo2 which in turn triggered early crystallization of magnetite.The close spatial association between the Longzhoushan lavs and the synchronous V-Fe-Ti deposit-bearing layered intrusions suggests a potential relationship between them. 相似文献
46.
地质力学的形成与发展 总被引:2,自引:0,他引:2
付毅 《安徽师范大学学报(自然科学版)》1994,17(2):95-99
本文较系统地介绍和阐述了地质力学的形成发展过程、基本理论和实践效应,并对今后研究的热点课题提出了估测性的看法。 相似文献
47.
以固液相变的统一模型方程为基础,计算了激光焊接与表面重熔不同加热模型条件下,液态熔池的形成过程,以及温度场和流场.主要考察了激光诱导的合金元素汽化和表面张力驱动流对自由表面温度分布及熔池形状的影响.结果发现,熔池自由表面温度和溶池形状主要受表面张力驱动的流体流动的影响,它在限制自由表面最高温度方面起着主要作用,合金元素汽化热损失的影响是第二位的.熔池的形状主要受液态金属涡旋方向的影响,在负的表面张力温度系数条件下,熔池浅而宽;在正的表面张力温度系数下,熔池深而窄. 相似文献
48.
InSAR技术在西藏玛尼强震区的应用 总被引:10,自引:0,他引:10
为测量 1997年 11月 9日西藏玛尼里氏 7.4级地震震前一年的地壳形变和震时同震形变 ,以地震震中为图像中心的 5 0 km× 5 0 km范围内 ,选择了 5景 ERS- 1/ 2数据组成5个像对 ,并在此基础上组成 2个差分像对 ,以分别表示地震前一年形变和同震形变 ,再应用合成孔径雷达干涉测量(In SAR)技术进行处理。在同震形变差分图上 ,地震断层作用清晰可辨 ,在卫星斜距方向上可测量出近 0 .5 m的形变。结果表明 :In SAR技术对于定量研究同震形变和地震断层具有特别的优势和广阔的应用前景 相似文献
49.
Lu Huafu Wang Shengli Suppe J. Hubert-Ferarri A. Jia Dong Yan Fuli Yin Donghao Chen Jian 《科学通报(英文版)》2002,47(6):494-499
The Quaternary Tailan River fault has been found in the Tianshan foothills area, the Xinjiang Uygur Autonomous Region. It is the recent boundary fault of the Tarim Basin coupling with the West Tianshan Mountains. In the light of measurement data of the slip which cuts the Quaternary deposits of different ages, the Quaternary kinematic figures of the Tailan River fault are estimated as follows: crustal shortening 3.7 km and shortening rate 1.59 mm/a, uplift of Tianshan Mountains 1.34 km and uplift rate 0.56 mm/a, and additional relief of 900 m. Considering the contribution of the Gumubiezi anticline close to the south of the Tailan River fault, the Quaternary crustal shortening and shortening rate of the Jiamu area are 4.8 km and 2 mm/a respectively. The above-mentioned data coincide with the crustal shortening rate calculated from the growth strata in the Kuqa area, as well as the GPS measurements in the Lake Issyk area and the Korla-Urumqi area, reflecting the fast thrusting period within the shortening tectonic processes of the rejuvenation foreland basin in front of the southern foothill of the West Tianshan Mountains since Neogene. 相似文献
50.
The on-going Three Gorges Project (TGP) aims to build one of the largest hydropower stations in the world. Previous investigations
have concluded that the reservoir is likely to induce medium-to-intense earthquakes. 23 GPS stations have been established
to maintain a geodetic and seismological monitoring network around the reservoir to monitor seismicity and crustal deformation,
and to facilitate mitigation activities in case an intense earthquake occurs. The velocity of GPS site was derived from 3
repeated GPS surveys. Meanwhile, another effort has been made to investigate the feasibility of application of satellite interferometric
synthetic aperture radar (InSAR) techniques in detecting crustal deformation possibly caused by impoundment of the Three Gorges
Reservoir. It has been made to derive digital elevation models (DEM) using European Remote Sensing (ERS) synthetic aperture
radar (SAR) imagery. Pairs of ERS SAR images in raw format are processed to generate digital elevation models. This effort
will help us evaluate the accuracy of the InSAR techniques for further derivation of background deformation patterns and future
detection of reservoir-induced crustal deformation in the area.
Foundation item: Supported by the Seismological Union Foundation of China (602015), NASA grant of US(NAG5-9065) and Key Project
of China Seismological Bureau(95-12-02)
Biography: Qiao Xue-jun(1968-), male, Associated professor, research direction: crustal deformation. 相似文献