Evolution of the microstructure and phase composition of a subsurface of cast HP-type alloy during a long-term high-temperature aging

被引：8

作者：

Kondrat'ev, Sergey Yu ^{[1
]}

Anastasiadi, Grigoriy P. ^{[1
]}

Ptashnik, Alina, V ^{[2
]}

Petrov, Sergey N. ^{[2
]}

机构：

[1] Peter Great St Petersburg Polytech Univ, Polytech Skaya St 29, St Petersburg 195251, Russia

[2] Cent Res Inst Struct Mat Prometey, Phys Mat Sci Lab, Shpalernaya St 49, St Petersburg 191015, Russia

来源：

MATERIALS CHARACTERIZATION | 2019年 / 150卷

关键词：

Microstructure; Phase composition; Heat-resistant cast Fe-Cr-Ni-based alloys; Oxidation; Morphology of oxides; Analytical electron microscopy; REFRACTORY ALLOY; OXIDIZING/CARBURIZING ENVIRONMENT; NIOBIUM CARBIDE; HK40; ALLOY; TRANSFORMATIONS; KINETICS; SERVICE; CRYSTALLOGRAPHY; 45KH26N33S2B2; COEFFICIENT;

D O I：

10.1016/j.matchar.2019.02.020

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The mechanism and kinetics of changes in the microstructure and phase composition of the surface diffusion area of the as-cast heat-resistant HP40NbTi alloy during prolonged, high-temperature aging in an oxidising environment are studied by optical microscopy, electron microscopy, electron microprobe analysis, and X-ray mapping. The transformation process of each phase of the alloy is unique, where these phases differ in their structure, chemical composition, and nature of the reaction with oxygen. When the alloy is oxidised, the chemical composition of the phases changes continuously according to complex laws, depending on the environment, temperature, and duration of exposure. An intensive exchange of chemical elements occurs between different phases. After long-term, high-temperature operation of the alloy, the process of oxidation of the phases probably attains a steady limiting state.

引用

页码：166 / 173

页数：8

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