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首页> 外文会议>Materials forum - aluminium alloys, their physical and mechanical properties - Volume 28 - 2004 >Constitutive Behaviour and Hot Tearing during Aluminium DC Casting
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Constitutive Behaviour and Hot Tearing during Aluminium DC Casting

机译：铝直流铸造时的本构行为和热撕裂

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The prediction of hot tears during DC casting is complicated because of the complexrncooling conditions and subsequent development of thermal stresses. Models developedrnfor this purpose require a detailed knowledge of the process conditions and hot tearingrnmechanisms. Therefore, a micro structural investigation of hot tearing in commercial alloysrnwas carried out in two ways: tensile specimens were deformed at various temperaturesrnabove the solidus, which conditions led to fracture. Further, crack propagation was studiedrnin-situ at semi-solid temperatures. In both cases, the fracture surfaces of the specimensrnwere investigated by SEM. Microstructural investigations of these cracks show that theyrninitiate at any weak spot such as a pore or partially liquid grain boundary and occur by arncombination of fluid film separation and rupture of solid bridges along grain boundaries.rnThis leads to brittle behaviour on the large scale although local deformation can be veryrnductile. Similarities between hot tears in industrial ingots and cracked specimens indicaternthat important aspects of hot tearing during casting can be simulated by tensilernexperiments at semi-solid temperatures.
机译：由于复杂的冷却条件和随后产生的热应力，对直流铸造过程中热裂的预测非常复杂。为此目的开发的模型需要对过程条件和热撕裂机理有详细的了解。因此，通过两种方式对商业合金的热撕裂进行了微观结构研究：拉伸试样在固相线以上的不同温度下变形，从而导致断裂。此外，在半固态温度下对裂纹扩展进行了原位研究。在这两种情况下，均用SEM观察了试样的断裂面。对这些裂纹的显微组织研究表明，它们在任何弱点（如孔或部分为液态的晶界）处发生，并且是由于液膜分离和沿晶界的固体桥断裂的结合而发生的.rn尽管局部变形，但仍导致大范围的脆性可以非常延展。工业铸锭的热撕裂和破裂的试样之间的相似性表明，铸造过程中热撕裂的重要方面可以通过半固态温度下的拉伸实验来模拟。

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