摘要:The conditions of floating off of iron-rich phase for Al-Mn brass, the distribution of iron in castings, the iron segregation and its prevention have been investigated in laboratory.The experimental results have been compared with the segregation in large propeller castings. The conclusions are that the iron-rich phase prefer to build up in the final solidified zone of castings, and there is a tendency to float off of iron-rich phase if the liquid alloys are kept quietly in a constant temperature that iron-rich phase has crystallized. A convection model has been taken to explain the formation of iron macrosegregation in castings.
摘要:The constitutional supercooling criterion of alloys with peritectic reaction in the directional solidification was proposed. The temperature gradient G was obtained by computer to treat the temperature date in front of the liquid-solid interface. The criterion was proved to be correct by the directional solidification experiment on Sb-Sn alloys
摘要:This paper introduce affection of the properties of gypseous mixture when certain quantity gypseous, refractory and water mixed. At the same time, also introduce affection of property of gypseous slurry sihce joined different quantity retarding agent. It is important to choose reasonable quantity in production
摘要:Hybrid binders are a unique blend from ethyl silicate and colloidal silica which provide the advantages of other binders, This paper systemetically studied two kinds of hybrid binders which had application in industrial production.
摘要:The operating life of plunger are a common problems in die casting process, In this paper, through the theoretic analysis, replace the spheroidal cast iron by medium carbon steel. The life of plunger be increased six times to ten times than the original state. The economical benifit and societal efficiency are goodly.
摘要:In this paper, mainly discuss the melting technology of Ni-Ti alloy. The uniformization of alloy constitutions is a technic key. It is both economical and simple to apply vaccum self-consuming scull furnace by melting once. Meanwhile, the wear
摘要:Research on the high efficient complex modifying agent proportionally consisting of sodium salts and barium,showed that the modifying agent is not only of characteristic of sodium salts by high efficiency and quick action, and great resistance to fading of modification, but also overcomes weakness easly fading after modification with sodium salts and potential period of barium modifying agent.