ＺＬ３０１合金机械性能不合格的分析及对策华南光学仪器厂铸造分厂赵静波１前言我厂从８０年代初开始ＺＬ３０１合金铸件生产，铸件机械性能合格率一直很低，常因出现裂纹、缩松等缺陷而报废。据统计，１９８８年至１９９１年，机械性能合格率仅为５８％，而机械性能合格... ZL301 alloy mechanical properties of unqualified analysis and Countermeasures South China Optical Instrument Factory Casting Factory Zhao Jingbo 1 Introduction Our plant from the early 80s ZL301 alloy castings production, casting mechanical properties pass rate has been very low, often due to cracks, shrinkage, etc. Defects and scrapped. According to statistics, from 1988 to 1991, the mechanical performance pass rate was only 58%, while the mechanical performance qualified ...