摘要:This paper introduces the thermal stress fatigue test apparatus with high temperature fluid particle furnace as a heat equipment. Some parameters were measured on this apparatus to define test condttiou to simulate the operating condition of metal mold for centrifugal casting iron pipe. The measured results of thermal stress fatigue tests showed that this apparatus and investigated test method are available.
摘要:In this paper, we make a thorough study of the effects and features of the aluminium-silicon alloy under the combined modification of strontium and sodium. The result of our study shows that in the process of the combined modification,because of their mutual influences, the strontium and sodium elements give fully play to their strong points and at the same time overcome their weak points.
Shenyang Polytechnie Univesity Du Hwaishen Zhai Qijie
Issue 5, Pages: 14-17(1988)
摘要:In this paper the experiments of suspension pouring of steel castings are carried out with step casting samples. The effects of, the quantities of dispersed inoculants introduced on the solidification characteristic have been investigated. In suspension pouring process the increase of cooling intensity during the solidification period will increase the tendency of volume solidification and decrease the solidification time. With the increasing of the quantity of dispersed inocu-lant, the volume of the shrinkage hole in the riser is decreased and the hole itself moves downwards. The equiaxial crystalline zone can be widened the crystalline grains caff become finer. The tendancy to shrinkage porsity, therefore can be reduced, and its distribution can be improved.
Shanghai Research Institute of Building Sciences Yu Lihang Yi Beihong Wang Ruiling
Issue 5, Pages: 18-23(1988)
摘要:Four major factors affecting propeties of a-hemihydrate gypsum used for casting mold at normal or high temperature have been presented theoretically in this paper. They are water-powder ratio, size distribution, crystalline morphology and phase purity. The authors have tested and verified the theory, and determined the related manufacturing technique, thus obtaining fine a-hemihydrate gypsum used for casting mold.