Macrostructure Control of a Complicated Copper-Nickel Based Alloy during Centrifugal Casting
A complicated copper-nickel based alloy was developed to fabricate wear-resisting bush for high temperature application. The concern focuses on the macrostructure control of the developed alloy ingot during centrifugal casting. The results show that the macrostructures of the ingot were determined by the pouring temperature of the melt. the control of the mold. such as the cooling rate and the rotation speed. In particularly. the control of the equiaxed grAln in the ingot is strongly depended on the pouring temperature. With the decrease in pouring temperature. the fraction of the equiaxed grAln in the transverse section of the ingot increases and the average length of columnar grAln decreases. When the pouring temperature is confined below 1250 ℃. complete equiaxed grAln will be obtAlned. Based on the optimal centrifugal casting processing. the tensile strength of the developed alloy ingot with the complete equiaxed grAln reaches to 810MPaand 435 MPa at room temperature and 500 ℃. respectively. which is 14％ and 110％ higher than that of common commercial QAllO-4-4 alloy. The wear rate of the developed alloy is 7.0×10-8 and 3.8×1O-7mm3 ·N-1·mm-1 at room temperature and 500 ℃. respectively. which is 5 times and 39 times lower than that of QAl1O-4-4 alloy.
Luo Zongqiang Zhang Weiwen Xin Baoliang Li Yuanyuan
School of Mechanical and Automotive Engineering. South China University of Technology. Guangzhou 510640. China
国际会议
69th World Foundry Congress(第69届世界铸造会议 WFC 2010)
杭州
英文
315-318
2010-10-16（万方平台首次上网日期，不代表论文的发表时间）