The authors believe that water accumulated on the surface of adhesion bridge neck from the sand-resin surface and atmosphere is a very factor to hot cracking tendency of resin coated sand.
环境湿度对覆膜砂铸型（芯）性能的影响是通过粘接桥界面上水分的积聚而起作用的。
The reasons of effect factors on the hot cracking tendency are analyzed by orthogonal experimental method and the best technology parameters of decreasing hot cracking tendency are obtained.
通过正交试验法获得了降低合金热裂倾向性的最佳工艺参数。
Moreover, they are able to decrease the temperature and increase the stress of hot cracking formation, as a result, decrease the tendency of hot cracking.
同时，稀土使合金的热裂纹形成温度降低，增加了热裂纹形成应力，降低了合金的热裂倾向性。
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