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The mechanisms of grain refinement were investigated on two kinds of grain refiners used in Ni—Fe based superalloys and complete atomic matching modes were constructed in this study.It is found that there are at least three matching crystal planes having the small lattice disregistry between the refiner and the nucleated phase,which can lead to grain refinement of y matrix.The results indicate that the(0001),(01—10) planes of CrFeNb have a fine crystallographic matching relationship with the(111),(110) planes ofγmatrix.The disregistry of(0001)_(CrFeNb)//(111)_γ,(0110)_(CrFeNb)//(111)_γand(0110)_(CrFeNb)//(110)_γis 3.34%,6.60%and 5.90%, respectively.The(0001),(0110) planes of Co_3FeNb_2 and(111),(110) planes ofγmatrix also have this relationship.The disregistry of(0001)_(Co3FeNb2)//(111)_γ,(0001)_(Co3FeNb2)//(110)_γ,(0110)_(Co3FeNb2)//(111)_γand (0110)_(Co3FeNb2)//(110)_γis 4.45%,9.35%,8.38%and 6.12%,respectively.
The mechanisms of grain refinement were investigated on two kinds of grain refiners used in Ni-Fe based superalloys and complete atomic matching modes were constructed in this study. It is found that there are at least three matching crystal planes having the small lattice disfiguration between the refiner and the nucleated phase, which can lead to grain refinement of y matrix. The results indicate that (0001), (01-10) planes of CrfNb have a fine crystallographic matching relationship with the (111), (110) planes of γmatrix The disregistry of (0001) _ (CrFeNb) // (111) _γ, (0110) _ (CrFeNb) // (111) _γand (0110) _ (CrFeNb) // (110) _γis 3.34%, 6.60% and (001) _ (Co3FeNb2) // (111) _γ, (0001), (0110) planes of Co_3FeNb_2 and (111), (110) planes of γmatrix also have this relationship (Co3FeNb2) // (110) _γ, (0110) _ (Co3FeNb2) // (111) _γand (0110) _ (Co3FeNb2) // (110) _γis 4.45%, 9.35%, 8.38% and 6.12% respectively.