The blind hole method was employed to measure the residual stress of the as-cast, annealed and mould cooled ductile iron specimens respectively. The experimental results show that cooling in sand mould can effectively relieve the residual stress of the casting as same as the annealing treatment does, and this method is simple and low cost.%采用盲孔法测定铸态、退火态和铸造后砂型保温的球墨铸铁件试样的残余应力.将试验结果通过计算得出各种状态下的残余应力.结果表明,砂型保温工艺和退火处理一样,能有效降低铸铁件的残余应力,而且该方法简单、节能、成本低.
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