Development Of A New High Chromium Ferroalloy With Wear And Corrosion Resistance

In this paper, the effect of Ni, Cu and Cr/C on microstructure and properties of high chromium ferroalloy is explored by the method of contrast experiment, and the development of a new high chromium ferroalloy with wear and corrosion resistance is finished.Firstly, the content of Ni, Cu in the new high chromium ferroalloy with wear and corrosion resistance is optimized by the method of orthogonal design. The results show: austenite matrix can be obtained by adding Ni to high chromium cast iron; as Ni content increases, impact toughness increases, corrosion resistance varys a little, and hardness and wear resistance decrease; when Ni content is 4%, hardness and wear resistance are optimum; the function of Cu is the same as that of Ni, and wear resistance and corrosion resistance are optimum when Cu content is 3%.Secondly, the effect of Cr/C on microstructure and properties is studied when Ni content is 4% and Cu content is 3%. The results show: Cr/C is a primary factor of affecting amounts and forms of carbides. Either Cr content or C content fixed to adjust Cr/C can both adjust amounts and forms of carbides greatly. With Cr content fixed, as Cr/C increases, amounts of carbides decrease, forms of carbides change from reticulation to fracted reticulation and isolated stick, impact fracture changes from brittle and ductile fracture to ductile fracture, impact toughness increases, but corrosion resistance, hardness and wear resistance decrease. With C content fixed at lower level, as Cr/C increases, amounts of carbides increase greatly, forms of carbides change from fracted reticulation and isolated stick to reticulation, impact fracture changes from ductile fracture to brittle fracture, impact toughness decreases, but corrosion resistance, hardness and wear resistance increase. But with C content at higher...