The ferritic-based ductile iron was subjected to friction stir processing（FSP）.The effects of FSP on the microstructure evolution and erosion wear angle on the erosion wear resistance of ferriticbased ductile iron were investigated by hardness tester

SEM

EPMA

XRD and erosion wear tester.The results reveal that graphites in the TMAZ of the FSP ductile iron are elongated by stirring

and graphites in the other regions maintain a spherical morphology.As the distance from the FSP surface increases

the content of martensite and retained austenite in the matrix is decreased

and the hardness correspondingly become lower.The martensite and retained austenite in the HAZ are formed around the graphite

and the rest area is ferrite.The FB ductile iron has an increased erosion wear resistance as the erosion wear angle increases.The erosion wear rate curve of FSP ductile iron presents bimodal

and the erosion wear resistance under the erosion angle of 20°and 45°is better.When the erosion angle is less than 50°

the erosion wear resistance of FSP ductile iron is better than that of FB ductile iron;on the contrary

the erosion wear resistance of FB ductile iron is better than that of FSP ductile iron.