连续铸造技术的发展概况及展望

回顾国内、国外连续铸造技术的发展概况；指出开发和完善“近终形连铸”、“单晶连铸”、“高效连铸”、“连铸坯热送热装”等技术和基于连铸技术研制新型材料是连铸技术发展的主要方向。     

挤压铸造Al-5Cu合金的组织与性能

使用挤压铸造工艺制备出一种新开发的、高强韧Al-5Cu合金,在50 MPa挤压力下铸造成型后,进行T4和T5热处理.经固溶处理后其抗拉强度达472 MPa,伸长率达10.5%.并对热处理状态下的组织和性能进行了分析研究.     

Effect of heat treatment on microstructure and properties of hot-extruded nickel-aluminum bronze

The effect of heat treatment on the microstructure and properties of a hot-extruded nickel-aluminum bronze was investigated. Experimental materials were heat treated through different processes, including quenching, normalizing, aging and annealing, and their microstructure, corrosion resistance and mechanical properties were characterized. It is found that quenching causes all β phase transformed into β phase, however, normalizing causes β phase transformed into β α and κ phases. When the quenched sample is aged, fine phase is precipitated from the as-quenched microstructure of β＇ phase. Annealing causes the transformation of β into a and κ phases. The results of mechanical property tests show that quenching, normalizing and aging improve the tensile strength and hardness of the experimental material, with a corresponding fall in elongation. Annealing raises the elongation but reduces the tensile strength and hardness. Furthermore, corrosion resistance of nickel-aluminum bronze ranks from worse to better in the following order： aged, quenched, normalized, hot-extruded and annealed. However, with the exposure time of corrosion test increasing, the difference of average corrosion rate between those nickel-aluminum bronzes tums small.     

Influence of heat treatment on tribological behaviors of novel wrought aluminum bronze

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双流浇注连续铸造过程浓度分布数值模拟

本文初步建立了双流浇注连续铸造圆柱坯的浓度分布数值模拟的数学模型,分析了不同工艺参数下的浓度场分布特征,包括拉坯速度、内导管插入深度和内浇包温度.并比较了内浇包熔体含量的模拟结果与铸坯横截面上Cu含量的试验结果,两者基本吻合.     

半连续铸造制备2024/3003梯度材料的研究

采用双流浇注半连续铸造方法制备了2024/3003铝合金梯度材料。研究了节流孔径和内浇包熔体温度两个工艺参数对铸件的成分分布，宏观组织和洛氏硬度的影响，结果表明，在保证铸造过程顺利进行的前提下，适当增大节流孔径和升高内浇包熔体温度都能增加铸件中内部合金的体积分数。合金的成分、宏观组织和力学性能之间的对应关系说明双流浇注半连续铸造方法制备2024/3003多元铝合金梯度材料是可行的。     

过共晶高硅铸造铝合金磷－稀土双重变质处理

采用正交实验方法研究了磷、混合稀土变质剂添加量和变质处理温度对Ａｌ－２２Ｓｉ－２ｃｕ－０．９Ｍｇ－１．０Ｎｉ过共晶高硅铸造铝合金变质效果的影响。结果表明：磷、稀土的添加量和磷变质处理温度对合金的变质效果起决定作用；稀土添加量对合金室温抗拉强度无明显影响，但能显著提高其高温强度；合金变质处理的最佳工艺如下：磷添加量为０．１％，稀土添加量为０．６％，磷变质温度为８３０℃，稀土变质温度为８１０℃。     

Rapidly solidified hypereutectic Al-Si alloys prepared by powder hot extrusion

Rapidly solidified hypereutectic Al-Si alloys were prepared by powder hot extrusion.By eliminating vacuum degassing procedure.the fabrication routine was simplified.The tensile fracture mechanisms at room temperature and elevated temperature were investigated by SEM fractography.Compared with KS282 casting material,the tensile strength of rapidly solidified Al-Si alloy is greatly improved due to silicon particles refining while its density and coefficient of thermal expansion are lower.than those of KS282.The wear resistance of RS AlSi is better than that of KS282.     

铝合金支架间接挤压铸造的研究

基于有限差分法，对大型铝合金支架间接挤压铸造充型和凝固过程进行了数值模拟。通过对模拟结果的分析，确定了浇注温度为700℃，压射速度为0．03m／s，完成了模具结构和工艺设计，并制作了模具，进行了支架挤压铸造的试制。分析了试制过程铸件缺陷产生的原因，发现气孔和氧化夹渣等是主要缺陷，通过调整脱模剂的配方，适当减少脱模剂的喷涂，缩短挤压铸造循环时间等，获得了品质和性能良好的支架铸件。     

有色合金连续铸造设备的发展状况

主要从设备类型、结晶器和控制系统三方面介绍了有色合金连续铸造设备的发展状况,同时简单介绍了复合材料连续铸造设备的开发情况,最后提出了有色合金连续铸造设备的发展方向.