Microstructural characterisation of Tristelle 5183 (Fe-21%Cr-10%Ni-7.5%Nb-5%Si-2%C in wt%) alloy powder produced by gas atomisation

被引：13

作者：

Carrington, M. J. ^{[1
]}

Daure, J. ^{[1
]}

Ratia, V. L. ^{[1
]}

Shipway, P. H. ^{[1
]}

McCartney, D. G. ^{[1
]}

Stewart, D. A. ^{[2
]}

机构：

[1] Univ Nottingham, Adv Mat Grp, Nottingham NG7 2RD, England

[2] Rolls Royce PLC, Goodwood, W Sussex, England

来源：

MATERIALS & DESIGN | 2019年 / 164卷

基金：

英国工程与自然科学研究理事会;

关键词：

Metals and alloys; Coating materials; Nuclear reactor materials; Rapid-solidification; Quenching; Powder metallurgy; Precipitation; RAPID SOLIDIFICATION; IRON; CONSTITUTION; RESISTANCE;

D O I：

10.1016/j.matdes.2018.107548

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Nitrogen gas atomised powders of the hardfacing alloy Tristelle 5183 (Fe-21%Cr-10%Ni-7%Nb-5%Si-2%C in wt%) were sieved into different particle size ranges and their microstructures have been investigated. Powder particles larger than approximately 53 mu m are composed of dendritic fcc gamma-Fe as the principal phase with smaller quantities of: alpha-Fe, an interdendritic silicide phase isostructural to Fe5Ni3Si2, and Nb(C,N). Particles <53 mu m have increasing quantities of either dendritic alpha-Fe or cellular silicide phase with decreasing amounts of gamma-Fe as the particle size decreases, along with similar to 5% Nb(C,N). Coarse (> 10 mu m) sized Nb(C,N) particles, that are seen in all powder size fractions, pre-existed in the melt prior to atomisation, whereas micron-sized Nb(C,N) particles that are found within alpha-Fe, gamma-Fe or silicide are the primary solidification phase. Nanoscale Nb(C,N) also formed interdendritically in the last stages of solidification. Compared with a mould cast sample, a significant difference is the suppression of M7C3 formation in all powder size ranges. The increasing quantities of alpha-Fe and silicide in smaller sized powder particles is consistent with increased undercooling prior to nucleation permitting metastable phase formation. (C) 2018 The Authors. Published by Elsevier Ltd.

引用

页数：13

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