一、问题的提出化学成分、金相硬度合格的铸件,在清理过程中有脆断现象。完检合格的铸件,用户反映在使用中也有易断现象。通过检验分析,认为铸件中残留铝太多(〔A~1〕_残~**==0.086％)是造成铸件脆断的主要原因。为解决铸件脆断和确定铸件中残留铝含量的最佳值,做了一些试验。 First, the question raised Chemical composition, metallurgical hardness of castings, brittle fracture phenomenon in the clean-up process. After the completion of qualified castings, users are also reflected in the use of vulnerable phenomenon. Through the inspection and analysis, it is considered that the residual aluminum in the casting is too much ([A ~ 1] _ ~ ** ** 0.086%) is the main reason for the brittle fracture of castings. In order to solve the casting brittle fracture and determine the best residual aluminum content in the casting, made some experiments.