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无冷隔
相关语句
  has no cold shut
     the surface of the ingots of LFEC has no cold shut and less segregation.
     锭坯表面无冷隔和少偏析瘤 ;
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  相似匹配句对
     the surface of the ingots of LFEC has no cold shut and less segregation.
     锭坯表面和少偏析瘤 ;
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     CRITERION FOR PREDICTING COLD SHUT MARK
     缺陷预测判据
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     There was not any cold-temperate fishes.
     温性鱼类。
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     A Study of Air-Cooled Liningless Cupola
     空炉衬冲天炉的研究
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     Cold insulation design for large scale ammonia storage tank
     大型液氨贮罐的设计
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Three new Al-Zn-Mg-Cu-Zr alloys were semi-continuously cast by Low Frequency Electromagnetic Casting (LFEC) and by conventional Direct Chilling Casting (DC) without electromagnetic field. The effects of low frequency electromagnetic field on as-cast microstructures, surface quality, intracrytalline element solubility and mechanical properties were investigated. The results show that microstructures of LFEC are fine, uniform, equiaxed, rose-shaped or globular, and its average sizes are between 20~40μm; the surface...

Three new Al-Zn-Mg-Cu-Zr alloys were semi-continuously cast by Low Frequency Electromagnetic Casting (LFEC) and by conventional Direct Chilling Casting (DC) without electromagnetic field. The effects of low frequency electromagnetic field on as-cast microstructures, surface quality, intracrytalline element solubility and mechanical properties were investigated. The results show that microstructures of LFEC are fine, uniform, equiaxed, rose-shaped or globular, and its average sizes are between 20~40μm; the surface of the ingots of LFEC has no cold shut and less segregation. Intracrytalline element solubility and mechanical properties of LFEC are greatly increased: the relative intracrytalline solubility of Zn, Mg and Cu are 75%~65%, 72%~66%and 45%~40% respectively. The as-cast ultimate strength is 330~350MPa and elongation is 0.8%~1.2%.

采用低频电磁LFEC和常规DC铸造技术 ,半连续铸造了三种新的Al Zn Mg Cu Zr合金 ,考察了两种技术铸造组织、锭坯表面状况、元素晶内固溶度和力学性能的区别。结果表明 ,低频电磁铸造组织均匀细小等轴 ,呈细小的蔷薇形和球形 ,平均晶粒尺寸为 2 0~ 5 0 μm ;锭坯表面无冷隔和少偏析瘤 ;合金元素在晶粒内的含量增加 ,Zn的相对溶质固溶百分数为 75 %~ 65 % ,Mg为 72 %~ 66% ,Cu为 4 5 %~ 4 0 % ;铸态力学性能显著提高 ,拉伸强度极限为 330~ 35 0MPa ,延伸率为 0 8%~ 1 2 %。

The air-conditioner swaying tray of automobile made of 4A11 aluminum alloy was manufactured by squeezing casting technology.When the pouring temperature is 740℃,the preheating temperature of the die set is 280℃ and the applying pressure is 1900kN(139.45MPa),the mechanical property of swaying tray is the finest.Under the condition of the optimal technological parameters,the tensile strength,Vickers hardness(HV_(0.1)) and(elongation) of swaying tray reach 310330MPa,HV100110,9%,respectively.The microstructures...

The air-conditioner swaying tray of automobile made of 4A11 aluminum alloy was manufactured by squeezing casting technology.When the pouring temperature is 740℃,the preheating temperature of the die set is 280℃ and the applying pressure is 1900kN(139.45MPa),the mechanical property of swaying tray is the finest.Under the condition of the optimal technological parameters,the tensile strength,Vickers hardness(HV_(0.1)) and(elongation) of swaying tray reach 310330MPa,HV100110,9%,respectively.The microstructures of swaying tray are fine,Si grains are uniformly distributed and no phenomena of coarsening are observed,and the surface and inside of swaying tray have no cold shut,gas cavity,shrinkage cavity and crack,etc.By means of analyzing tensile fractures,the importing pieces and the pieces with the optimal technological parameters both have the fracture characteristics of the dimple.The number of dimples of the importing pieces are greater,so the plasticity is higher.The dimples of the pieces with the optimal technological parameters are bigger.

选用4A11铝合金,利用挤压铸造技术生产汽车空调器摇盘。当浇注温度为740℃,模具预热温度280℃,施加的压力1 900 kN,即比压为139.45 MPa时,摇盘的力学性能最好。在最佳工艺参数条件下,摇盘的强度σb为310~330 MPa;维氏硬度HV0.1为100~110;延伸率能达到9%,摇盘的微观组织良好,Si颗粒分布均匀,无严重粗化现象,摇盘表面及内部无冷隔、气孔、缩孔、裂纹等缺陷。通过对拉伸断口分析,进口制件和最佳工艺下形成的制件都具有韧窝断口特征,进口制件断口韧窝较多,其相对塑性较高,最佳工艺条件下制件的韧窝较大。

 
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