Influence of pre-transition elements on structures and properties in Fe-Ni based alloy design

Abstract

Fe-Ni based alloys have been widely used in nuclear and aerospace industries due to their excellent high temperature strength, preferable combination of hardness and toughness, outstanding corrosion and oxidation resistance. However, with the accelerated development of modern industry, the service environment becomes more severe, thus the traditional Fe-Ni based alloys may hardly meet the requirements of future engineering applications. In this paper, the effects of the addition of pre-transition group elements on the phase structure and properties of Fe-Ni alloys were reviewed. Based on the basic theory of thermodynamics of phase diagram and phase transition, the focus is on the effects of addition of pre-transition group elements (RE, Ti, V, Cr, Zr, Nb, Mo, Hf, Ta, W, etc.) on the phase structure of the alloy; the relationship between the composition-structure-service properties of Fe-Ni-based alloys were further discussed; and it was pointed out that the current research work on element modified Fe-Ni based alloys tends to focus on the synergistic effect of multiple alloys on Fe-Ni based alloys, and lacks the research on adding a single element and the corresponding thermal and kinetic data support. On this basis, the mechanism of action of different elements was explored; the corresponding thermal and kinetic databases were established to optimize the simulation and calculation solutions of alloys in the oxidation process.

Keywords

• pre-transition element
• fe-ni based alloy
• phase diagram
• structure
• performance