Fragmented structure of niobium carbide particles in as-cast modified HP alloys

被引：36

作者：

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

Sviatysheva, Ekaterina V. ^{[2
]}

Anastasiadi, Grigoriy P. ^{[1
]}

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, Shpalernaya St 49, St Petersburg 191015, Russia

来源：

ACTA MATERIALIA | 2017年 / 127卷

关键词：

Niobium carbide; Heat-resistant cast Fe-Cr-Ni-based alloys; Microstructure; Morphology of carbide; Phase composition; Analytical electron microscopy; HIGH-TEMPERATURE SERVICE; OXIDIZING/CARBURIZING ENVIRONMENT; PHASE-TRANSFORMATIONS; YTTRIUM ADDITION; CARBON DIFFUSION; MC CARBIDES; HK40; ALLOY; MICROSTRUCTURE; TRANSITION; ORDER;

D O I：

10.1016/j.actamat.2017.01.043

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The structure of niobium carbide particles in as-cast heat resistant modified HP4ONbTi alloy have been studied by light and electron microscopy, electron microprobe and X-ray diffraction. The niobium carbide particles in the structure of the HP4ONbTi alloys are a multiphase polycrystal clusters with inhomogeneous chemical composition and crystallographic form. The boundaries between the crystals of the carbide particle are large-angle; the disorientation angle between crystals is 30-60. Polycrystalline character of carbides is, probably, connected with the high thermal stress arising at interphase boundaries in the alloy structure at primary cooling of an ingot. The explanation of the polymorphic character of a niobium carbide cluster requires an independent analysis on the basis of a structural and geometrical crystallography. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：267 / 276

页数：10

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