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针对K424精密铸造增压涡轮叶片出现的热裂问题,采用组织观察和计算模拟的方法,分析增压涡轮用K424合金特性以及涡轮叶片铸造中出现热裂的原因,并对比K418合金提出合金热裂倾向性的影响因素以及减少热裂的建议.结果表明,铸造增压涡轮热裂倾向性与合金特性及铸件特性等有关.K424合金中Al和Ti元素含量较高,导致合金中共晶组织含量多且尺寸大,与K418合金相比,热裂倾向性较大;另一方面,由于铸件叶片位置厚度小且曲率变化大,易形成应力集中,导致热裂.为减小热裂倾向性,需控制K424合金中Al和Ti元素含量并选择合理的工艺参数.
Aiming at the thermal cracking problem of K424 precision casting turbocharged turbine blade, the characteristics of K424 alloy used in turbocharged turbine and the cause of thermal cracking in turbine blade casting were analyzed by using the method of microstructure observation and calculation simulation. The thermal cracking of alloy K418 The results show that the hot tearing tendency of the foundry turbocharger turbine is related to the characteristics of the alloy and the characteristics of the castings.The content of Al and Ti in the K424 alloy is relatively high and the content of eutectic in the alloy is large And large size, compared with the K418 alloy, hot cracking tendency larger; the other hand, the thickness of the casting leaves small and large changes in curvature, easy to form stress concentration, leading to thermal cracking .In order to reduce the tendency of hot cracking needs Controlling the content of Al and Ti in K424 alloy and choosing the reasonable process parameters.