主动加载式热裂倾向性测试装置的研制

Development of the Active Loading Hot Tear Tendency Test System for Casting Alloy

材料的热裂倾向是评价材料铸造性能的重要指标之一。针对铸件在凝固过程中因收缩而产生的局部应力集中及开裂现象,研制了一种采用砂型铸造的主动加载式热裂倾向测试装置。通过对圆柱形试棒中部设置加热铜块形成热节,并对试棒进行主动拉伸来模拟大型铸件的凝固收缩过程,通过对试棒凝固过程中的热节温度、应力及拉伸量等数据进行综合分析来表征该材料在实际浇注过程中的热裂倾向性大小。该装置有效地提高了大型铸件热裂倾向性评价的准确性,具有较好的实用价值。

Hot tear tendency of casting alloy is one of the importance indexes for evaluating the casting property. An active loaded hot tear tendency test device for casting alloy was developed for researching the casting＇s local stress concentration and cracking. The device can simulate large casting＇s solidification process by setting heat copper billet in the middle of the test bar to make a hot pot in this position and stretching the test bar. The system can forecast the hot tear tendency of large casting by measuring the data like hot spot＇s temperatures, strains and shifts. The device can effectively improve the accuracy of evaluation for large casting hot tear tendency, and practical value is good.