摘要:This essay based on our pervious research and by the scanning electronic microscope and electronic probe as a major method, makes a study of the states of linear distribution of Na,Sr elements under different conditions and their content in a micro area and their influence to the growth of the "peculiar" appearance of eutectic silicon.
摘要:The ZL5012 alloy (Al-Zn-Mg-Fe) squeeze castings have high quality surface and sound structure. After heat treatment, they may be obtained high mechanical properties,ab = 490530MPa, 6= 35% In addition, the solution treatment temperature range of ZL5012 alloy is wide. Therefore, We can economically and conveniently squeeze casthigh quality castings.
摘要:In this paper,the hot cracking tendency of Al-Cu alloys is investigated. The results suggest that the magnitudes of the strength and failure strain of the" alloys during solidification are not likely to be related to the hot cracking tendency. The tendency is in ralation to the extent of temperature range of hot brittleness and the rate of strength increase in this temperature range. A wider temperature range or a faster rate of increasing strength in that range would result in an easier formation of concentrated strain, and hence a more serious tendency to hot crack.
摘要:In this paper, we evaluated the influence of magnesium addition on the effect of modification and tested whether the modifying process was necessary or not. It was found that the properties of pistons casting with no modifying melts were satisfying, as long as the magnesium content in alloy was controlled and the pistons were heat-treated in Te condition. Without modifying process, economical benefit was increased, working condition was improved and environmental contamination was decreased
摘要:In the present paper fracture appearance and metallogra-phical structure of aluminum alloy die castings weighing from 0.24 to 4.8Kg were examined during in probing into factors affecting the properties of load-subjected die castings.The existance of broken chilling layer was found in those castings. The" forming mechanisms of broken chilling laver and its influence on the propertiesof die castings were studied. The work has a practical significance to the improvemend of quality of die casting and to the prevention of rejects caused by tke broken chilling layer.
Xu Yunxiang,Yang Zhenhe,Wang Guobao,X,Jinmei,Wang Ke
Issue 2, Pages: 25-28(1989)
摘要:In the paper the method of R.A.Johus for feeding sand steel casting is modified to used for investment castings. A program in IBM-PC computer is written for risering the investment steel casting.