Nucleation Crystallography of Ni Grains on CrFeNb Inoculants Investigated by Edge‐to‐Edge Matching Model in an IN718 Superalloy. Issue 2 (20th September 2017)

• Record Type: Journal Article
• Authors: Yang, Wenchao; Qu, Pengfei; Liu, Lin; Jie, Ziqi; Huang, Taiwen; Wang, Feng; Zhang, Jun
• Is Part Of: Advanced engineering materials. Volume 20:Issue 2(2018)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2017-09-20
• Subjects: edge‐to‐edge matching model -- grain refinement -- Ni‐based superalloys -- nucleation -- orientation relationship; Materials -- Periodicals; 620.11
• DOI: 10.1002/adem.201700568
• Languages: English
• ISSNs: 1438-1656

Abstract

Abstract : In this work, the nucleation crystallography of CrFeNb intermetallic particles as a grain refiner for Ni‐based IN718 superalloys is studied using Edge‐to‐Edge Matching model. Three distinguishable orientation relationships between CrFeNb intermetallic particles and Ni grains are well predicted: [ 1 1 ¯ 0 ] N i ∖ ∖ [ 1 ¯ 2 1 ¯ 0 ] C r F e N b, (111)Ni 1.28° from (0004)CrFeNb, [ 1 1 ¯ 0 ] N i ∖ ∖ [ 1 ¯ 2 1 ¯ 0 ] C r F e N b, (111)Ni 1.32° from ( 20 2 ¯ 0 ) CrFeNb, and [ 1 1 ¯ 0 ] Ni //[0001]CrFeNb, (111)Ni 0.72° from ( 20 2 ¯ 0 ) CrFeNb . The results indicate that CrFeNb intermetallic particles have a strong nucleation potency as an effective grain refiner for Ni‐based superalloy and the existence of semi‐coherent interfaces between the CrFeNb intermetallic particles and Ni grains. Furthermore, the IN718 superalloy is used to experimentally validate the grain refinement effect of CrFeNb intermetallic particles, showing that its grain size is obviously refined from 8.60 to 1.23 mm. And, the corresponding heterogeneous nucleation mechanism of grain refinement at the atomic level is further identified. Abstract : The nucleation crystallography of CrFeNb particle on Ni grain is studied using Edge‐to‐Edge Matching model. Three orientation relationships are predicted to indicate a semi‐coherent interface. A relaxation of some atoms may be necessary to minimize the nucleation interface energy. IN718 superalloy is used to validate the grain refinement effect.