七、硅碳比对灰铸铁件残留应力的影响铸件的残留应力受到许多因素的影响,如铸件结构、铸造工艺、冷却条件以及铸铁性质等。灰铸铁本身的应力倾向性是影响铸件残留应力大小的重要因素之一,因而研究铸铁成分对残留应力的影响是很必要的。铸造残留应力主要是热应力和相变应力综合作用的结果。在铸件本体上测定残留应力是比较困难的,而且测定的数据可信度也较差。早在70年以 VII, silicon-carbon ratio on the residual stress of gray cast iron Residual stress of castings by many factors, such as casting structure, casting process, cooling conditions and cast iron properties. The tendency of gray cast iron itself is one of the important factors affecting the residual stress of castings. Therefore, it is necessary to study the effect of cast iron composition on residual stress. Casting residual stress is mainly the result of the combined effect of thermal stress and phase transformation stress. It is difficult to measure the residual stress on the body of the casting, and the confidence of the measured data is also poor. As early as 70 years