Characteristics of AlN inclusions in low carbon Fe-Mn-Si-Al TWIP steel produced by AOD-ESR method

被引：33

作者：

Liu, H. ^{[1
]}

Liu, J. ^{[1
]}

Michelic, S. ^{[2
]}

Wei, F. ^{[1
]}

Zhuang, C. ^{[1
]}

Han, Z. ^{[1
]}

Li, S. ^{[1
]}

机构：

[1] Univ Sci & Technol Beijing, Engn Res Inst, Beijing 100083, Peoples R China

[2] Univ Leoben, Chair Met, Franz Josef Str 18, A-8700 Leoben, Austria

来源：

IRONMAKING & STEELMAKING | 2016年 / 43卷 / 03期

基金：

中国国家自然科学基金;

关键词：

TWIP steels; AOD; ESR; Aluminium nitride inclusions; Thermodynamics; LIQUID-IRON; HOT-DUCTILITY; AIN FORMATION; ALUMINUM; NITROGEN; THERMODYNAMICS; SOLUBILITY; ALLOYS; EQUILIBRIUM; MECHANISM;

D O I：

10.1179/1743281215Y.0000000028

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

Argon oxygen decarburisation-electroslag remelting (AOD-ESR) process has been well used to produce the Fe-Mn-Si-Al twinning induced plasticity steel (TWIP) steels. The characteristics of AlN inclusions formed in TWIP steels after AOD refining, ESR and forging process were investigated by scanning electron microscopy and X-ray energy dispersive spectrometry. An automated program called 'INCAFeature' was used to collect statistics of inclusion characteristics. Great differences on the amount, distribution and morphologies of AlN inclusions were observed in AOD ingots, ESR ingots and forgings. The dominating inclusions in AOD ingots are mainly single Al(O) N and MnS(Se)-Al(O) N aggregate, accounting for 66.7% of the total inclusions. After the ESR process, AlN inclusions in all size range significantly decreased, which were rarely observed in ESR ingots. Thermodynamic calculations show that AlN inclusions can precipitate in the liquid Fe-Mn-Si-Al TWIP steels, which is different from the viewpoint of literatures that the precipitation of AlN inclusions took place at solidifying front or solid phase. Furthermore, the thermodynamic calculation result has been verified by high temperature laser scanning confocal microscope experiments.

引用

页码：171 / 179

页数：9