熔融还原炉内二次燃烧和传热

总结了熔融还原炉内二次燃烧和传热的研究成果，对于转炉采用二次燃烧提高废钢比也有借鉴作用。     

浅谈青钢“九五”发展思路

青钢应从我国钢铁工业的实际出发，在“九五”期间，遵循量力而行的原则，采取两步走的方法，于１９９８上和２０００年分别达到年产８３万ｔ和１１７万ｔ钢的综合生产能力。主要措施是：优化工艺结构，消除二次化铁炼钢；优化炼铁系统装备结构；推进炼钢技术进步，提高连铸比，并以市场为导向，优化产品结构。     

Mg-Li-Al合金近液相线制浆及部分重熔

采用近液相线铸造方法制备了Mg—5％Li—3％A1合金的半固态浆料。通过对该合金近液相线铸造与常规铸造组织进行比较，以及在不同静置时间、不同冷却速率下对其铸造组织的影响，较详细地分析了近液相线铸造组织的变化过程。试验结果表明，在Mg—Li合金熔炼中，添加2％Ca可实现阻燃，但效果不如对一般镁合金；与常规铸造相比，近液相线铸造可获得均匀、细小枝晶的组织结构；适当静置或提高冷却速率有利于组织的细化和均匀化；在适当的部分重熔工艺条件下，坯料组织可获得较理想的触变组织。     

铸型尼龙改性的研究进展

铸型尼龙产品广泛地用于各种机械零件，改性后的铸型尼龙，可克服其自身的缺点，满足工业应用的要求。文章就我国近年来在铸型尼龙改性研究方面的情况及不同的改性方法做了详细的介绍。     

Two dimensional deformation characteristics of bloom CC with liquid core reduction

A two-dimensional model was applied to simulate the liquid core reduction(LCR) technology of bloom CC using ANSYS software.The deformation characteristics of bloom under different liquid fraction and reducing amount are obtained.The results indicate that the main deformation condition of bloom shell is compressive strain,mainly undertaken by the liquid core,which increases with the enhancement of reducing amount.Solidified shell takes minor deformation.The longitudinal section of bloom appears sunken and the narrow side bulges,which grow serious when the liquid fractionincreases.     

Stickiness, Functionality, and Microstructure of Food Powders

Three major aspects of food powder are described and discussed. Stickiness is one issue that can cause production and product handling difficulties. Stickiness has been interpreted in a number of ways and thus measured differently. Functionality of the primary (single) particles or agglomerated powders is of practical interest to the consumers. The desired quality will have to be matched or exceeded by the powder manufacturers. Finally, microstructure provides a key linkage between the production and the functionality. Its formation has impacts on both the stickiness and functionality.     

Evaluation of the reactivity of titanium with mould materials during casting

A methodology for evaluating the reactivity of titanium with mould materials during casting has been developed. Microhardness profiles and analysis of oxygen contamination have provided an index for evaluation of the reactivity of titanium. Microhardness profile delineates two distinct regions, one of which is characterised by a low value of hardness which is invariant with distance. The reaction products are uniformly distributed in the metal in this region. The second is characterised by a sharp decrease in microhardness with distance from the metal-mould interface. It represents a diffusion zone for solutes that dissolve into titanium from the mould. The qualitative profiles for contaminants determined by scanning electron probe microanalyser and secondary ion mass spectroscopy in the as-cast titanium were found to be similar to that of microhardness, implying that microhardness can be considered as an index of the contamination resulting from metal-mould reaction.     

乳化炸药混装车水孔爆破的优越性

该文分析了应用袋装炸药装填水孔爆破产生拒爆、"冲天炮"、根底偏高和爆破效果差等问题,然而应用乳化炸药混装车装填水孔可以解决这些问题,并且爆破后具有根底平整、大块率低、毒气少和综合效益高等优点.以三峡永久船闸旁侧泄水箱涵工程和江苏田湾核电站工程为例进行了分析.     

REHEATING TEMPERATURE CONTRAST AND MICROSTRUCTURES OF 7075 Al ALLOY CAST BY LIQUIDUS SEMI-CONTINUOUS CASTING

In this study, reheating of liquidus semi-continuous cast billets of 7075 Al alloy was carried out in a resistance furnace, and the temperature contrast of the outer and the center of the reheated billets was investigated, then the reheating microstructures were investigated. Results show that: the difference of temperature between the outer and center is small and the difference of their microstructures are also small. During reheating at 576℃ the spheroidization of grains is significant after 5min and no rosettes are visible after 20min by optical microscopy. Similar observations were madeon materials reheated at 596℃, but the ripening process is faster. The grains growup to 30-60μm, fine enough for thixoforming.