苏彦庆
,
叶喜葱
,
郭景杰
,
傅恒志
稀有金属材料与工程
提出了一种钛铝基合金金属型真空吸铸成形新方法,并通过数值模拟研究了TiAl基合金薄板、叶片的充型规律.研究表明,在真空吸铸过程中,充型速度和石墨吸口直径的增加,有利于充型分数的提高,另外石墨吸口直径与反向充填出现的位置密切相关.在凝固过程中,合金从下而上逐层凝固,但随着铸型温度的增加,凝固了的合金在金属液中所占的比例减少.以数值模拟结果指导试验,得到质量良好的TiAl基合金薄板和叶片铸件.
关键词:
真空吸铸
,
数值模拟
,
石墨吸口直径
,
凝固分数
,
充型分数
Y.C. Miao
,
X.M. Zhang
,
G.D. Wang
金属学报(英文版)
The position of the solidification completed temperature of twin roll stainless strip casting process is very important to the quality of the casting strip. In order to control this position, the solidification completed temperature should be known at first.The present paper first simulated dendritic microsegregation under conditions of twin roll stainless strip casting, and got the relationship between the temperature and solid fraction of the mush zone. The temperatures such as ZDT (equal to the solidification completed temperature) and LIT (liquid impenetrable temperature), et al., also were obtained. Then by using the turbulent model, the flow and thermal fields of the pool of the twin roll stainless strip casting, and the speed and temperature fields of different casting speeds were given and also explained. The results are coincident with the experimental result. Combined with the results of these two simulations. the appropriated casting speed was found.
关键词:
strip casting
,
null
,
null
,
null
,
null
R.B. Song
,
Y.L. Kang
,
J.L. Sun
金属学报(英文版)
The experimental study on the familiar 60Si2Mn and 1Cr18NigTi materials rolled in the semi-solid state was carried out. Experimental results show that the segregation of liquid occurs when the semi-solid slurry is rolled, which influences the microstructure and mechanics performance of workpiece under room temperature. The globular solid particles don't present plastic deformation unless high solid fraction. At the same time, the mechanics property of workpiece is pretty good while the semi-solid slurry of 1Cr18NigTi material is rolled by a pass and no other treatment.
关键词:
semi-solid slurry
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null
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null
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null
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