Coherent precipitation and stability of cuboidal B2 nanoparticles in a ferritic Fe–Cr–Ni–Al superalloy. Issue 11 (2nd November 2021)

• Record Type: Journal Article
• Authors: Wang, Zhenhua; Wang, Qing; Niu, Ben; Dong, Chuang; Zhang, Hongwei; Zhang, Haifeng; Liaw, Peter K.
• Is Part Of: Materials research letters. Volume 9:Issue 11(2021)
• Page Start: 458
• Page End: 466
• Publication Date: 2021-11-02
• Subjects: Fe-based superalloy -- coherent precipitation -- lattice misfit -- particle coarsening -- mechanical properties; Materials science -- Research -- Periodicals; Biomedical materials -- Research -- Periodicals; Composite materials -- Research -- Periodicals; Biomedical materials -- Research; Composite materials -- Research; Materials science -- Research; Periodicals; 620.1105
• DOI: 10.1080/21663831.2021.1973130
• Languages: English
• ISSNs: 2166-3831

Abstract

Abstract : The present work developed a new Fe-based superalloy of Fe–10.9Cr–13.9Ni–6.4Al–2.2Mo–0.5W–0.04Zr–0.005B (weight percent, wt. %) with cuboidal B2 nanoparticles coherently precipitated into the body-centred-cubic (BCC) matrix. This alloy possesses excellent microstructural stability at 973 K with a slow particle coarsening rate and the B2 nanoprecipitates still keep cuboidal after 1000 h-aging, which is ascribed to the moderate lattice misfit ( ϵ = 0.24–0.67%) between BCC and B2 phases. Also, the current alloy exhibits a prominent mechanical property with a high yield strength of σYS = 238–258 MPa at 973 K. IMPACT STATEMENT: A Fe-based superalloy with cuboidal B2 nanoparticles coherently precipitated into BCC matrix exhibits high microstructural stability and prominent mechanical property at 973 K.