Formation of the properties of antimony matrix alloys for frame-type composite materials

A frame-type composite material (CM) produced upon impregnation represents a system consisting of a rigid porous frame and a matrix material filling its voids. When metals are used as a matrix material, they bring up specific problems related to melting of a metal, such as the thermal effect of the metal on the frame and the chemical interaction of the matrix and frame with the formation of brittle compounds. A CM that combines the best characteristics of its components can be produced. Since impregnation is, as a rule, performed under vacuum, melting of a matrix metal is accompanied by an increase in the evaporation rate. The evaporation of a matrix metal can be decreased by controlling its chemical composition, decreasing the melting temperature of the melt, and controlling the cooling rate. In this work, antimony alloys are used as a matrix material and their properties are studied.     

Optimization of the process of manufacture of diamond-containing composite materials based on titanium carbide-steel alloys

Conclusions A study was made of the conditions of production of tungsten-free composite materials by sintering in a high-pressure chamber and in vacuum. Good-quality nonporous specimens of titanium carbide-steel materials cannot be produced by hot pressing in graphite dies. The hardness of materials sintered in a HPC is higher (81–86 HRA) than that of materials sintered in vacuum (75–82 HRA.). Heat treatment slightly lowers it (to 77–85 HRA). The highest wear resistance is exhibited by vacuum-sintered materials. In alloys sintered in a HPC a directional orientation of the steel binder with titanium carbide grain inclusions was observed. In service tests the properties of composition diamond-containing materials based on titanium carbide-steel alloys were found to match those of Tvesal alloys-diamond-containing composites based on a tungsten-group hard metal.Translated from Poroshkovaya Metallurgiya, No. 7 (259), pp. 21–25, July, 1984.     

Development of a new method to produce melts suitable for the production of amorphous Fe−Si−B materials

Research work was performed on the development of a new reduction process for the melting and refining of boron containing alloys used in the production of amorphous material for transformer cores. Based on fundamental thermodynamics principles, a reduction refining process was developed which employs conventional steelmaking vessels for using steel scrap, ferro alloys, and boron ores to produce an Fe−Si−B alloy. The process can eliminate the need for ferro boron alloy, high purity iron, and remelt stock to produce the Fe−Si−B alloy. Process variables were established which show the effects of mixing time, reductant alloy additions, slag chemistry, and temperature on the reduction kinetics. Final melt chemistries have lower levels of sulfur, nitrogen, and other tramp elements than conventional methods for producing the Fe−Si−B melt.     

Technique for simulating high-cycle rolling to produce metallic materials reinforced by particles

A technique is developed to simulate the high-cycle rolling used to produce particle-reinforced materials, such as an aluminum–copper composite material. The technique is based on the results of real rolling and on a mathematical model, which is based on the results of calculation with criterion conditions. The application of a criterion approach allowed us to predict the possibilities of formation of high-strength bonding of the components of the aluminum–copper composite material at retained integrity in the first rolling cycle and to determine the conditions that ensure breaks in the integrity of the reinforcing component in the next cycles in order to produce a particle-reinforced material.     

One-zone rolling of composite materials

The energy–force parameters of free rolling of a strip without its tension and rolling with one backward or forward creep zone in the deformation zone are compared. The limiting backward or forward tensions are determined, and the change in the linear sizes of a composite billet during deformation in a rolling mill is considered.     

特种合金双辊薄带连铸生产技术进展

双辊薄带连铸技术（TRC）已发展到产业化的初级阶段,如日本新日铁、德国Eurostrip、美国Castrip、韩国Postrip等公司的薄带连铸生产能力已达30～50万t/a,多炉连浇时间超过10h。介绍了多种特种合金,如髙硅电工钢（w（Si）为4.5%～6.5%）、高速钢、Invar合金、Inconel合金、TWIP钢等可用双辊薄带连铸,一次性形成毫米级薄带。由于高速冷凝,晶粒细化,成分偏析极少,生产成本低,成材率高,TRC是当前双辊薄带连铸产业化的新途径之一。