变形铝合金在水冷连续铸造条件下,都呈现不同的裂纹倾向。铸锭裂纹是熔铸生产中的主要废品之一。铸锭在铸造过程中,由于冷却强度大,保留着大量的残余应力,有拉应力区和压应力区。当拉应力超过该合金的δ_b时,将在拉应力区产生裂纹。影响应力大小的因素是多方面的,因而铸锭裂纹的形态也是多种多样。但是,产生的铸锭裂纹绝大多数是热裂纹和由热裂纹引伸的冷裂纹,而纯属冷裂纹的情况不多。 Deformed aluminum alloy in water-cooled continuous casting conditions, have shown a different tendency to crack. Ingot cracking is one of the major waste products in casting production. In the casting process, the ingot retains a large amount of residual stress due to its high cooling strength, with tensile and compressive stress zones. When the tensile stress exceeds the alloy δ_b, cracks will occur in the tensile stress zone. Factors affecting the size of the stress is multifaceted, so ingot crack morphology is varied. However, the majority of the ingot cracks produced are hot cracks and cold cracks extending from the hot cracks, but not enough cold cracks.