5052铝合金铸造显微疏松分析及控制
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摘要
对5052铝合金的铸造显微疏松组织的检验方法及产生疏松的因素进行分析。采用不同的氢含量、冷却速度及铸造速度进行铸造试验,使用定量金相法评定样品的显微疏松。结果表明:当熔体的氢含量控制在0. 10 m L/(100 g Al)以下时,能有效地控制铸造组织中的显微疏松程度;采用较大的冷却水压力配合较慢的铸造速度可以形成更良好的液穴形状。更均匀的温度场和成分场,能有效地减少铸造组织中的显微疏松。
Analysis and investigation were conducted on test methods and influencing factors of the cast microporosity of 5052 aluminum alloy. The microporosity of the sample was assessed by the quantitative metallography after the cast experiment with different hydrogen contents,cooling rates and casting speeds. The research shows that the hydrogen content of the melt below 0. 10 m L/100 g can effectively control the degree of microporosity in the casting structure. A better liquid sump shape,more uniform temperature field and composition field can be formed by using higher cooling water pressure and slower casting speed,which can effectively reduce the microporosity in the casting structure.
Analysis and investigation were conducted on test methods and influencing factors of the cast microporosity of 5052 aluminum alloy. The microporosity of the sample was assessed by the quantitative metallography after the cast experiment with different hydrogen contents,cooling rates and casting speeds. The research shows that the hydrogen content of the melt below 0. 10 m L/100 g can effectively control the degree of microporosity in the casting structure. A better liquid sump shape,more uniform temperature field and composition field can be formed by using higher cooling water pressure and slower casting speed,which can effectively reduce the microporosity in the casting structure.
引文
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[4]汪德涛.变形铝合金疏松的组织特征及其对性能的影响[J].轻合金加工技术,2000,28(4).
[5] FANG Q T,GRANGER D A. Porosity formation in modified and un-modified A356 alloy casting[J]. AFS Trans,1989,97:989-1000.
[6] LEE Y W,CHANG E,CHIEU C F. Modeling of feeding behavior of solidifying Al-7Si-0. 3Mg alloy plate casting[J]. Metell Trans,1990(21B):715-722.
[2]麻向军,金胜灿,佟国栋,等.影响铝合金铸件显微疏松的因素[J].铸造,2002,51(7).
[3]李爱兰,余乾.关于“铸造高温合金显微疏松评定方法”和“铸造高温合金晶粒度评定方法”两项航标的说明[J].材料工程,2009(4):28-30.
[4]李学朝,等.铝合金材料组织与金相图谱[M].北京:冶金工业出版社,2010:266.
[4]汪德涛.变形铝合金疏松的组织特征及其对性能的影响[J].轻合金加工技术,2000,28(4).
[5] FANG Q T,GRANGER D A. Porosity formation in modified and un-modified A356 alloy casting[J]. AFS Trans,1989,97:989-1000.
[6] LEE Y W,CHANG E,CHIEU C F. Modeling of feeding behavior of solidifying Al-7Si-0. 3Mg alloy plate casting[J]. Metell Trans,1990(21B):715-722.