共查询到19条相似文献,搜索用时 135 毫秒
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Al10Zn2.9Mg1.7Cu超高强铝合金的喷射成形制备研究 总被引:12,自引:4,他引:8
采用喷射成形技术制备了Al10Zn2.9Mg1.7Cu高强高韧铝合金沉积坯件,研究了喷射成形制备过程中各工艺参数对沉积坯件的成形性、显微组织、致密度的影响,确定了适当的工艺参数,研究了沉积坯件的热挤压及热处理工艺,对材料的组织进行了分析并对不同状态的材料性能进行了比较。研究结果表明:当喷射成形工艺参数合理时,沉积坯件具有良好的成形性与致密度,在随后的热挤压过程中,通过较低的挤压比即可使材料达到全致密;通过对合金进行适当的热处理,材料的极限抗拉强度达到810MPa,同时延伸率保持在8%-11%,该材料是一种理想的轻质高强结构材料。 相似文献
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提出了基于往复式喷射成形工艺制备大璧厚非规则管坯的近终形成形工艺及其工艺参数优化方法,以实现坯件从CAD设计到喷射成形的快速制备过程。该工艺方法包括三个阶段:非规则管坯的三维CAD设计、分层处理和单层沉积厚度计算;基于沉积厚度与往复速度和质量流率的对应关系,计算满足各层沉积厚度所对应的控制参数;利用控制系统和执行机构对控制参数进行实时控制和调节,采用往复式多层喷射成形工艺制备满足设计轮廓的管坯。通过试验进行了验证,喷射成形制备的管坯形状和轮廓与CAD设计模型较好地一致,表明了该工艺方法的可行和正确性。 相似文献
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采用喷射成形技术制备了Al1 0 Zn2 .9Mg1 .7Cu高强高韧铝合金沉积坯件 ,研究了喷射成形制备过程中各工艺参数对沉积坯件的成形性、显微组织、致密度的影响 ,确定了适当的工艺参数 ,研究了沉积坯件的热挤压及热处理工艺 ,对材料的组织进行了分析并对不同状态的材料性能进行了比较。研究结果表明 :当喷射成形工艺参数合理时 ,沉积坯件具有良好的成形性与致密度 ,在随后的热挤压过程中 ,通过较低的挤压比即可使材料达到全致密 ;通过对合金进行适当的热处理 ,材料的极限抗拉强度达到 810MPa ,同时延伸率保持在 8%~ 11% ,该材料是一种理想的轻质高强结构材料。 相似文献
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喷射成形工艺参数及热挤压制度对8009耐热铝合金的组织及性能的影响 总被引:2,自引:1,他引:1
采用喷射成形方法制备了A1-8.5Fe-1.4v-1.7Si(8009)耐热铝合金,研究了喷射成形工艺参数及沉积坯件的热挤压工艺对材料的微观组织及性能的影响。结果表明:喷射成形工艺能够有效地抑制8009合金中粗大的富铁相的析出,获得均匀细小的组织;当喷射成形工艺参数选择适当时,沉积坯件具有良好的成形性与致密度,在随后的热挤压过程中,通过较低的挤压比即可使材料达到全致密。合金经过热挤压后,在室温及高温下均具有良好的力学性能。 相似文献
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Spray deposition is a novel manufacturing process which is currently being developed for producing near-net-shape preforms.
Spray deposition involves the creation of a spray of droplets by a gas atomizer and the consolidation of these droplets on
a substrate to create a preform. In order to maximize the metallurgical benefits of spray deposition, a thorough characterization
of momentum and heat transfer in the gas-atomized spray is required. The present paper describes measurements of particle
size, gas velocity, particle velocity, and spray temperature in gasatomized Sn-Pb sprays. Measurements were performed on steady-state
axisymmetric sprays which were generated using a close-coupled gas atomizer with Sn-5 wt p t Pb and Sn-38 wt p t Pb alloys,
atomizer gas flow rates of 2.5 g/s (0.56 MPa) and 3.4 g/s (1.04 MPa), melt flow rates of 35 and 61 g/s, and atomizer-substrate
distances of 180 and 360 mm. Gas velocities in the range to 4 m/s were measured using Pitot tube and laser Doppler anemometry
(LDA). Droplet velocities in the range 3 to 32 m/s were determined from photographic streak-length measurements and LDA. Oil
calorimetry of the spray enthalpy indicated that the spray temperature decreased with increasing axial distance from the gas
atomizer, increasing gas flow rate, and decreasing melt flow rate.
Formerly Doctoral Student, Department of Metallurgy and Science of Materials, Oxford University 相似文献
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Analysis on the deposition behavior of spray on deposition surface was made and an optimization method for the movement parameters (u, ω) of substrate was obtained. Simultaneously, a mathematical model of growth of tubular preform, specifically aimed at the kind of atomizer that is fixed and with a tilt angle was established. By integrating the optimization method and the mathematical model, the growth process and shape of preform were simulated. The results show that the tilt angle of atomizer plays an important role on the dimensions and shapes of tubular preforms and it can provide a guidance for the development of spray forming equipment. 相似文献
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REN Sanbing FAN Junfei LE Hairong Advanced Technology Division Research Institute Baoshan Iron & Steel Co. Ltd. Shanghai China 《Baosteel Technical Research》2011,5(3):15-19
Spray forming is a new type of metal material forming process,which can produce metal blanks such as billet,tube,plate etc.A mathematical model has been developed to forecast the shape evolution of tube billets during the spray forming process.The atomizer mass flux as,radial distribution coefficient bs,draw velocity and diameter of mandrel were considered in this model and the influence of different parameters such as metal flowrate,draw velocity of mandrel,diameter of mandrel on the tube’s shape change were simulated and analyzed in this paper.The simulation results obtained from this model can be provided to engineers as reference. 相似文献
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对多层喷射沉积制备大规格管坯工业化生产特点进行了分析,表明Osprey多程技术更适宜于喷射沉积工业化生产。构建了由系统管理层/控制层/设备层组成的三层递阶控制结构。对关键工艺参数的闭环控制技术进行了研究,提出了漏包连续移液和基于积分分离PID的液位精确控制结构和方法,研究了管坯沉积层厚度的在线检测及喷嘴喷射高度在线反馈控制方法,提出了基于沉积室微正压环境的氧含量控制技术。控制系统及相关控制技术已在国内首条自行研制的喷射沉积制备铝合金管坯工业化生产设备中得到应用,已生产出最大长度1500mm、最大壁厚300mm、不同内径的铝合金产品。 相似文献
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溶液前驱体等离子喷涂技术(SPPS)是以溶液前驱体替代常规等离子喷涂中的粉末,通过在等离子射流中形成细小陶瓷粒子,并沉积在基体上制备出具有独特结构涂层的新技术。溶液前驱体注入位置、溶液前驱体流量和喷涂距离显著影响涂层微观结构。分析表明:通过减小溶液前驱体注入位置、降低溶液前驱体流量可以保证更高比例溶液前驱体在等离子射流中发生充分反应,提高了涂层致密度。减小喷涂距离使更多在等离子射流中形成的陶瓷粒子以熔融态沉积在基体上,形成孔隙尺寸小及垂直裂纹密度高的YSZ涂层。 相似文献
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A three-dimensional model of the spray forming method 总被引:2,自引:0,他引:2
Hyun-Kwang Seok Kyu Hwan Oh Hyung Yong Ra Dong-Hun Yeo Ho-In Lee 《Metallurgical and Materials Transactions B》1998,29(3):699-708
A three-dimensional model has been formulated to calculate the shape of the general preform, using vector calculus. The shape
of a rod, tube, plate, or irregular preform can be calculated at given spray forming conditions. The shape of a spray-formed
rod was analyzed at various spray forming conditions using the three-dimensional model. The effects of spray forming parameters,
such as spray distribution parameters, angular velocity of rotation, withdrawal velocity, spray angle, and eccentric distance
on rod shape, were analyzed. The most important parameters affecting the shape of rods are the spray distribution parameters
and the withdrawal velocity. The dynamic evolution of rod shape with a stepwise variation of the withdrawal velocity during
spray forming was investigated. The effect of a stepwise change of the withdrawal velocity was the same as that of the scanning
atomizer. The calculated surface profiles were compared with those of spray-formed 7075 aluminum alloy rods prepared on a
pilot scale. The calculated results for the surface profiles were in agreement with those of the spray-formed rods. 相似文献