Effect of reclaimed sand additions on mechanical properties and fracture behavior of furan no-bake resin sand

作     者：Yan-lei Li Guo-hua Wu Wen-cai Liu An-tao Chen Liang Zhang Ying-xin Wang 

作者机构：National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composites School of Materials Science and Engineering Shanghai Jiao Tong University Shanghai Light Alloy Net Forming National Engineering Research Center Co. Ltd. 

出 版 物：《China Foundry》 (中国铸造（英文版）)

年 卷 期：2017年第14卷第2期

页      面：128-137页

核心收录：

学科分类：080503[工学-材料加工工程] 0806[工学-冶金工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 0802[工学-机械工程] 0702[理学-物理学] 080201[工学-机械制造及其自动化] 

基　　金：sponsored by the National Natural Science Foundation of China(Nos.51275295 and 51201102) the Shanghai Rising–Star Program(No.14QB1403200) Research Fund for the Doctoral Program of Higher Education of China(Nos.20120073120011 and 20130073110052) 

主　　题：reclaimed sand mechanical properties thermal decomposition fracture mode 

摘      要：In this work, the effects of reclaimed sand additions on the microstructure characteristics, mechanical properties and fracture behavior of furan no-bake resin sand have been investigated systematically within the temperature range from 25 to 600 oC. The addition of 20%-100% reclaimed sand showed dramatic strength deterioration effect at the same temperature, which is associated with the formation of bonding bridges. Both the ultimate tensile strength(UTS) and compressive strength(CS) of the moulding sand initially increase with the increase of temperature, and then sharply decrease with the further increase of temperature, which is attributed to the thermal decomposition of furan resin. The addition amount of reclaimed sand has a remarkable effect on the room temperature fracture mode, i.e., with the addition of 0-20% reclaimed sand, the fracture mode was mainly cohesive fracture; the fracture mode converts to be mixture fracture mode as the addition of reclaimed sand increases to 35%-70%; further increasing the addition to 100% results in the fracture mode of typical adhesive fracture. The fracture surface of the bonding bridge changes from a semblance of cotton or holes to smooth with the increase of test temperature.