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Effect of electric current pulse on shrinkage cavity and porosity in casting ZA27 alloy;

脉冲电流对铸造ZA27合金中缩孔和疏松的影响

Factor Analysis and Countermeasures of Porosity and Pipe in Ingot;

钢锭疏松、缩孔的因素分析及对策

In this paper, analysis on the fissuring accident of ZGMn13Cr2Mo antifriction tup is performed, and the reason is believed to lie in serious casting defects of shrinkage cavity, porosity and inclusion.

对ZGMn13Cr2Mo耐磨锤头的断裂事故进行了分析,主要原因是存在着严重的铸造缺陷:缩孔、疏松和夹杂物。

Results indicate that the primary cause to the rupture of the screw in the process of torque force test is proved to be heavily existence of holes and pore gaps in the screw arising from the central looseness of the original billet.

结果得出:螺钉在扭力试验过程中断裂是由于内部存在严重的孔洞和孔隙所造成的,孔洞和孔隙来源于原铸坯的中心疏松。

Mechanism of central parosity and looseness of small billet is described and analysed.

简述小方坯中心缩孔和疏松的形成机理 ,提出减轻中心缩孔和疏松的措

The experimental results show that there are some internal metallurgy flaws such as looseness,shrink hole in the raw material of the axle,and bad widmanstatten structure from the overheating and over-burning during the heating of forging,the comprehensive effects of these factors cause the steel toughness to reduce,and the internal cleavage exists d.

结果表明,车轴轴头原材料中存在疏松、缩孔残余等内部冶金缺陷和锻造热加工中的过热和过烧产生不良的魏氏组织,这些因素的综合作用致使钢的韧性降低,在锻造中发生内部劈裂,最终造成轴头在受外力时脆性断裂。

A new heterogeneous polymerization process, in which water acted as a dispersed phase and methyl methacrylate (MMA) as a continuous phase, was developed to prepare porous poly(methyl methacrylate) (PMMA) resin.

　以水为分散相、甲基丙烯酸甲酯(MMA)为连续相进行悬浮态乳液聚合,合成疏松型聚甲基丙烯酸甲酯(PMMA)树脂。

Mold-filling, solidification and prediction of shrinkage porosity in Ti-46%Al alloy investment were performed using the ViewCast code, and the defects observed in the actual products agree well with the simulated results.

应用铸造软件ViewCast模拟精密铸造Ti 46%Al合金叶片的充型与凝固过程,预测了疏松的形成,模拟结果与实验结果相吻合。

Vibroflotation compaction is a comparably mature method for the improvement of cohesiveless soils,but it is seldom used to strengthen loose silty fine sands,especially for depth over 15m.

结合上海市某重点工程,基于吹填粉细砂的工程特性,通过现场试验探索出振冲工艺的主要设计和施工参数,对深度15m以上的饱和疏松粉细砂地基采用振冲加固的有效性进行了现场试验研究。

They are as following: there is loose defect on the inner side,at the same time ther.

本文对开裂的阀体取样进行了化学成分、力学性能和金相组织的测定,找出了造成ZG20CrMoV阀体打水压断裂的主要原因是内部有疏松缺陷,内表面有沿着疏松长十几毫米的裂纹,再加上塑性和韧性都低,造成了最终打水压时的开裂。

Experimental Study of The Effect of OPGmRNA and RANKLmRNA about The method of Bu Shen Jian Pi on The Osteoporosis rat;

补肾健脾法对骨质疏松大鼠OPGmRNA、RANKLmRNA表达影响的实验研究

Effects of Bushenfugai Traditional Chinese Medicine on morphometry of osteoporosis induced by ovary irradiation in rats;

补肾富钙中药对大鼠卵巢辐射损伤所致骨质疏松形态计量学的影响

Progress in the research into the relationshipbetween osteoporosis and jaw implant;

骨质疏松症与颌骨种植体关系研究进展

Theorectical and experimental study on internal defect of equal diameter axis formed in multi-wedge cross wedge rolling;

楔横轧多楔成形等直径轴类件内部疏松的理论与实验研究

On the industrial experiments the effect of electromagnetic stirring on central porosity,equiaxial crystal ratio,shrinkage cavities and surface quality as well as effect of electromagnetic stirring on the solidification of the continuous casting billet have been analyzed and discussed.

根据工业试验结果,分析了结晶器电磁搅拌(M-EMS)对马氏体不锈钢连铸坯的中心疏松、等轴晶率、缩孔及表面质量的影响,并对电磁搅拌对铸坯凝固的影响机理进行了探讨。

At the present production conditions,the results of trials showed that centerline segregation and central porosity are improved.

对结晶器电磁搅拌改善大方坯质量进行了工业性对比试验,并对电磁搅拌参数进行了优化,在现有的工艺条件下,达到了改善铸坯中心偏析和中心疏松的目的。

Fracturing sand control technology of unconsolidated sandstone reservoir;

疏松砂岩油藏压裂防砂一体化技术

Study of model for elastic wave velocity of unconsolidated sandstone;

疏松砂岩弹性波速模型的研究

In consideration of the problems of wellbore shrink after mechanical sand control implemented in unconsolidated sandstone reservoirs in Shengli Oilfield, an integrated casing string is developed for zonal mechanical sand control and zonal oil production.

针对胜利油田疏松砂岩油藏机械防砂后井筒内径变小,现有分采工艺均无法实施的问题,研制了适合小直径套管的机械分层防砂与分层采油一体化管柱。