扰流倾斜剪切流变对AlSi9Mg合金组织的影响
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摘要
半固态流变成形技术的独特优势是工艺流程短、生产成本低、生产效率高,这些优点符合当今时代节能减排和绿色铸造的要求。近些年来半固态流变成形技术已经成为了半固态成形技术的发展趋势。而在半固态成形技术中,半固态合金的制备技术一直是国内外半固态成形技术领域研究的一个热点。
本文利用自主设计制造的带有扰流柱的倾斜流变装置制备半固态AlSi9Mg合金。研究了浇注长度、斜槽倾斜角度、扰流柱形状、扰流柱排列形式及扰流柱排列间距对半固态AlSi9Mg合金组织的影响。并且探讨了不同振动维数和振动频率对半固态AlSi9Mg合金组织的影响。研究结果表明:
合金浇注温度为615℃,浇注长度为400mm,斜槽倾斜角度为45°时可以制备出比较理想的半固态AlSi9Mg合金。
扰流柱参数对半固态AlSi9Mg合金组织的影响较大;在本试验条件下,最佳的扰流柱形状为水滴形、排列形式为叉排、排列间距为排间距S=15mm,列间距L=40mm,制备的半固态AlSi9Mg合金的微观组织特征为:初生固相率为53.54%,晶粒尺寸为5.59μm,圆整度为0.61。
振动维数对半固态AlSi9Mg合金组织的影响较大;二维振动优于一维振动,在本试验条件下,XZ方向振动,振动频率为40Hz时,制备的半固态AlSi9Mg合金的微观组织特征为:初生固相率为37.56%,初生固相率的晶粒尺寸为5.53μm,圆整度为0.57。
振动频率对半固态AlSi9Mg合金组织的影响较大;三维振动时,在本试验条件下,振动频率为30Hz时,制备的半固态AlSi9Mg合金的微观组织特征为:初生固相率为56.32%,晶粒尺寸为4.07μm,圆整度为0.51。
The greatest advantage of semi-solid rheological forming process is process flow short, low production costs and high production efficiency, which is in line with the requirements of Energy-saving and emission reduction and Green casting. In recent years it has become a major trend of semi-solid forming technology. In the semi-solid forming technology, the preparation of semi-solid alloy has been a hot research field at domestic and abroad.
In this paper, water quenched samples of AlSi9Mg are prepared by using the self-designed Tilt rheological device with the Turbulence column. Pouring length, Angle of inclination, Shape of the pin fins, Forms of pin fins arrangement and Pin fins arrangement spacing are studied to find how they affect the microstructure of AlSi9Mg semi-solid alloy. Different vibration frequency and vibration dimension are studied to find the effect of the microstructure of semi-solid AlSi9Mg alloy. The results showed that:
When pouring temperature is 615℃, Pouring length is 400mm,and angle of inclination is 45°, the obtained of semi-solid AlSi9Mg alloy melt is nearly ideal.
Pin Fins parameters have great effect on the microstructure of semi-solid AlSi9Mg alloy. In this experiment, when the shape of Pin Fins is Droplets form, the form of Pin fins is arrange staggered, Row spacing S2 is 15mm, and column spacing L2 is 40mm, we can get good microstructure. Its solid fraction is 53.54%, grain size 5.59μm, and shape factor is 0.61.
Vibration dimensions have great influence on the microstructure of semi-solid AlSi9Mg alloy, and we discover that two-dimensional vibration was better than one-dimensional vibration. In this experiment, when vibration is XZ direction with the vibration frequency of40Hz,we can get good microstructure. Its solid fraction is 37.56%, grain size is 5.53μm, and shape factor is 0.57.
Vibration frequency has great influence on the microstructure of semi-solid AlSi9Mg alloy. When the three-dimensional vibration with the frequency of 30Hz, we can get good microstructure. Its solid fraction is 56.32%, grain size is 4.07μm, and shape factor is 0.51.
本文利用自主设计制造的带有扰流柱的倾斜流变装置制备半固态AlSi9Mg合金。研究了浇注长度、斜槽倾斜角度、扰流柱形状、扰流柱排列形式及扰流柱排列间距对半固态AlSi9Mg合金组织的影响。并且探讨了不同振动维数和振动频率对半固态AlSi9Mg合金组织的影响。研究结果表明:
合金浇注温度为615℃,浇注长度为400mm,斜槽倾斜角度为45°时可以制备出比较理想的半固态AlSi9Mg合金。
扰流柱参数对半固态AlSi9Mg合金组织的影响较大;在本试验条件下,最佳的扰流柱形状为水滴形、排列形式为叉排、排列间距为排间距S=15mm,列间距L=40mm,制备的半固态AlSi9Mg合金的微观组织特征为:初生固相率为53.54%,晶粒尺寸为5.59μm,圆整度为0.61。
振动维数对半固态AlSi9Mg合金组织的影响较大;二维振动优于一维振动,在本试验条件下,XZ方向振动,振动频率为40Hz时,制备的半固态AlSi9Mg合金的微观组织特征为:初生固相率为37.56%,初生固相率的晶粒尺寸为5.53μm,圆整度为0.57。
振动频率对半固态AlSi9Mg合金组织的影响较大;三维振动时,在本试验条件下,振动频率为30Hz时,制备的半固态AlSi9Mg合金的微观组织特征为:初生固相率为56.32%,晶粒尺寸为4.07μm,圆整度为0.51。
The greatest advantage of semi-solid rheological forming process is process flow short, low production costs and high production efficiency, which is in line with the requirements of Energy-saving and emission reduction and Green casting. In recent years it has become a major trend of semi-solid forming technology. In the semi-solid forming technology, the preparation of semi-solid alloy has been a hot research field at domestic and abroad.
In this paper, water quenched samples of AlSi9Mg are prepared by using the self-designed Tilt rheological device with the Turbulence column. Pouring length, Angle of inclination, Shape of the pin fins, Forms of pin fins arrangement and Pin fins arrangement spacing are studied to find how they affect the microstructure of AlSi9Mg semi-solid alloy. Different vibration frequency and vibration dimension are studied to find the effect of the microstructure of semi-solid AlSi9Mg alloy. The results showed that:
When pouring temperature is 615℃, Pouring length is 400mm,and angle of inclination is 45°, the obtained of semi-solid AlSi9Mg alloy melt is nearly ideal.
Pin Fins parameters have great effect on the microstructure of semi-solid AlSi9Mg alloy. In this experiment, when the shape of Pin Fins is Droplets form, the form of Pin fins is arrange staggered, Row spacing S2 is 15mm, and column spacing L2 is 40mm, we can get good microstructure. Its solid fraction is 53.54%, grain size 5.59μm, and shape factor is 0.61.
Vibration dimensions have great influence on the microstructure of semi-solid AlSi9Mg alloy, and we discover that two-dimensional vibration was better than one-dimensional vibration. In this experiment, when vibration is XZ direction with the vibration frequency of40Hz,we can get good microstructure. Its solid fraction is 37.56%, grain size is 5.53μm, and shape factor is 0.57.
Vibration frequency has great influence on the microstructure of semi-solid AlSi9Mg alloy. When the three-dimensional vibration with the frequency of 30Hz, we can get good microstructure. Its solid fraction is 56.32%, grain size is 4.07μm, and shape factor is 0.51.
引文
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[2] D. H. KIRKWOOD. Semisolid Metal Processing. International Materials Reviews. 1994, 39(5): 173-189
[3]杨妮,葛正浩,任威,等.金属半固态成形工艺概述.铸造技术, 2007, 28(1): 142-145
[4]邢书明,鲍培玮.绿色铸造技术与应用.李增民.河北省铸造行业协会第十五届铸造年会论文汇编.石家庄:河北科技大学出版社, 2009: 84-95
[5] M. C. FLEMINGS. Behavior of Metal-alloys in the Semi-solid State. Metallurgical Transactions, 1991, 22(5): 957-981
[6]赵祖德,罗守靖.半固态成形应用现状与未来.锻压技术, 2006(6): 1-4
[7]张小立.铝、镁合金半固态浆料制备技术的研究. [大连理工大学博士论文]. 2008: 14-20
[8]朱成才,张鹏.半固态金属成形技术的研究及应用.热加工工艺, 2006, 35(13): 81-86
[9] H TOSHIO. Semi-solid strip casting using a twin roll casting equipped with a cooling slope. Journal of Materials Processing Technology, 2002(11): 558~561
[10]李东南,林涵,吴树森.流变压铸成形镁合金AZ91D的显微组织与性能.材料热处理学报, 2007, 28(4): 64-69
[11]肖黎明,张励忠,张密兰,等.半固态挤压铸造工艺参数对制件性能的影响.热加工工艺,2006, 35(1): 40-43
[12]肖黎明,张励忠,张密兰,等.半固态挤压铸造工艺参数对制件性能的影响.热加工工艺,2006, 35(1): 40-43.
[13] J.M.PERRY, A.NEVILLE. Assessment of the corrosion rates and mechanisms of WC-Co-Cr HVOF coating in static and liquid-solid impingement saline enviornments, Surafee and Coatings Technology, 2001 (137): 43-51
[14] M. C. FLEMINGS. Behavior of metal alloys in the semi-solid State. Metall.Trans, 1991, 22B: 269-293.
[15]郭洪民.半固态铝合金流变成形工艺与理论研究. [南昌大学硕士论文]. 2007:10-20
[16]江运喜,谢水生.半固态金属浆料制备新技术.锻压技术, 2003(6): 41-47
[17]齐丕骧.挤压铸造技术的最新发展.特种铸造及有色合金, 2007, 27(9): 688-694
[18] D. H. KIRKWOOD, P. Kapranos. Semi-solid processing of alloy. Met Mater, 1988, 11(2): 16-19
[19] Y. L. LU, M. Q. LI. Deformation behavior and microstructural evolution during the semi solid compression of Al4CuMg alloy. MaterialsCharacterization, 2005, (5): 4232430
[20] J. H. HANS. Semi-solid Processing of Alloys and Composites. Foundry Management & Tech-nology, 1998, (4): 236-239
[21]李东南,陈丁桂,范新凤.半固态挤压铸造镁合金坯料组织与性能研究.特种铸造及有色合金, 2007, 27(12): 929-932
[22]管仁国,邢振环,王超,等.新型倾斜板技术制备半固态铝合金坯料和浆料.特种铸造及有色合金, 2007, 27(1): 30~34
[23]王英杰.倾斜冷却剪切流变对半固态ZAlSi9Mg合金组织及性能影响研究. [河北科技大学硕士论文]. 2007: 23-44
[24]侯文杰.半固态流变压铸AlSi9Mg组织及性能研究. [河北科技大学硕士论文]. 2009: 23-44
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