Influence of Si and Ni elements on low-temperature property of ductile iron castings for MW wind power generator
Abstract：In order to analyze the effect of Si and Ni elements on the low-tempareture property of ductile iron castings for MW wind power generator,the low-tempareture impact tests for ductile iron with Si content of 1.9%~2.5% were carried out at-20℃ and the low-tempareture impact tests for QT350-22L were performed at temperatures from-20 to-80℃.In addition,the comparison with the results of the impact tests for QT350-22L with Ni content of 0.1%~1.0% at-20℃ was also conducted.The results show that the content of Si element is the main influencing factor on the low-tempareture property of ductile iron castings,and it is not suggested to improve the low-tempareture property of ductile iron castings through adding Ni element.When the content of Si element in the ductile iron castings for MW wind power generator is controlled within the range of 2.1%~2.3%,the property of the castings can meet the use requirement.Within a certain range,the lower the content of Si element is,the better the low-temperature impact property of the ductile iron castings for MW wind power generator is,but the larger the sensitivity of low-temperature impact property to temperature is.
Keywords：ductile ironlow-temperature impact propertygraphite globeimpact fracture surfaceAk-T curvestress concentrationtemperature sensitivityferrite matrix
Publication Date：2011-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)