Effects of Trace Element Si on Microstructure and Mechanical Properties of K452 Ni-based Cast Superalloy
The effects of different Si additions on the microstructure,tensile properties and stress rupture properties of K452 Ni-based cast superalloy after standard heat treatment were studyied.Using OM,SEM,EDS and other experimental methods,the following results are obtained:in K452 Ni-based cast superalloy,the addition of Si has a great influence on the morphology and distribution of carbides.Due to the increase of Si content,the number of carbides distributed on the grain boundary increases.The effect of Si less than 0.5wt%on the tensile strength of the alloy is not obvious,but the tensile strength of the alloy decreases significantly when the amount of Si is greater than 1.0wt%.The stress rupture life of the alloy at 900℃/200 MPa decreases obviously with the increase of Si content.
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