采用Gleeble3800热模拟试验机对液相线铸造获得的ZL201合金半固态坯料进行了不同工艺参数下的热模拟试验，并进行了变形抗力本构方程拟合，以此为基础根据Stefan方程确定了幂律模型中的表观粘度等参数，采用商用仿真软件ANYCASTING对汽车发动机支架进行了触变压铸过程数值模拟分析，获得了ZL201合金的半固态充填流动特征响应，结果表明：半固态表观粘度随剪切速率增大而下降，在充型过程中呈现剪切变稀的触变成形特点，半固态浆料将以层流方式充填型腔，可获得充型完好的半固态压铸零件。
Thermal simulation compression tests on semisolid billet of ZL201 alloy prepared by NearLiquidusCasting at different parameters were carried out using the Gleeble3800 dynamic material testing machine, and then the constitutive equation of semisolid ZL201 alloy was established based on the experimental data. According to the constitutive equation and the equations presented by Stefan, parameters of power law model, such as apparent viscosity, were identified. The commercial simulation software ANYCASTING was applied to simulate and analyze the thixotropic diecasting processes of semisolid automobile engine bracket. The flow characteristic of semisolid ZL201 alloy in semisolid diecasting processes was investigated with simulation. The results show that the apparent viscosity decreases with the increase of shear rate, semisolid alloy shows that shearing thinning thixotropy, the semisolid slurry filled the cavity by way of laminar flow, with the sound semisolid diecasting part obtaining.
参考文献
| [1] | 张新,张奎,李兴刚,李宏伟,张宝东,李永军,王长顺.AZ91D镁合金半固态成形技术研究进展[J].铸造,2010(08):790-795. |
| [2] | 路贵民,只立群,马鸣图.半固态金属触变成形本构关系的研究现状[J].汽车工程,2009(05):430-434. |
| [3] | 郑鹏,徐骏,张志峰,白月龙,石力开.A357铝合金半固态流变压铸数值模拟[J].特种铸造及有色合金,2010(01):43-46. |
| [4] | 康永林,宋仁伯,杨柳青,张帆.金属材料半固态凝固及成形技术进展[J].中国材料进展,2010(07):27-33. |
| [5] | 毛卫民.半固态金属流变铸造技术的研究进展[J].特种铸造及有色合金,2010(01):24-35. |
| [6] | 只立群,路贵民,崔建忠.铝合金触变压缩变形行为研究[J].东北大学学报（自然科学版）,2010(05):673-676,684. |
| [7] | 张先宏 .镁合金热变形过程试验研究和数值模拟[D].上海交通大学,2003. |
| [8] | 崔成林,毛卫民,赵爱民,钟雪友.半固态触变压射成形过程模拟及验证[J].北京科技大学学报,2001(03):237-239. |
| [9] | 胡亚平,陈国香.镁合金压铸充型过程的模拟仿真与试验验证[J].模具工业,2008(07):49-53. |
| [10] | 王平,康浩,史立峰,路贵民,崔建忠.ZL201合金半固态成形的AnyCasting模拟与验证[J].稀有金属材料与工程,2006(06):880-884. |
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