Exploring accurate structure, composition and thermophysical properties of η carbides in 17.90 wt% W-4.15 wt% Cr-1.10 wt% V-0.69 wt% C steel. (September 2018)

• Record Type: Journal Article
• Authors: Chong, XiaoYu; Guan, Pin-Wen; Hu, MingYu; Jiang, YeHua; Li, ZuLai; Feng, Jing
• Is Part Of: Scripta materialia. Number 154(2018)
• Page Start: 149
• Page End: 153
• Publication Date: 2018-09
• Subjects: Carbides -- First-principles calculations -- Mechanical properties -- Thermodynamics -- EPMA; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2018.05.038
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: The heat resistance of the η carbides is important for red hardness and hot strength of high tungsten iron-base alloys. The crystal structure and exact composition of η carbides in this work are revealed to be cubic, Fe3.01 W2.33 Cr0.38 V0.28 C1.06 by extraction, X-ray diffraction refinement and electron probe micro-analysis. Defect formation energy calculations show that Cr and V occupy W sites in the lattice. Cr and V decrease the mechanical properties and weaken the elastic heat resistance of η carbides, which is attributed to the CCr and CV bonds weaker than CW bonds and the CCr bonds population decrease at high temperature. Graphical abstract: Unlabelled Image