Transient Evolution of Inclusions during Al and Ti Additions in Fe-20 Mass pct Cr Alloy
Transient Evolution of Inclusions during Al and Ti Additions in Fe-20 Mass pct Cr Alloy
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Fe-20 Cr合金中Al和Ti添加过程中夹杂物的瞬态演化
DOI：
10.3390/met9060702
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发表时间：
2019-06
期刊：
影响因子：
2.9
通讯作者：
Yimin Zhang
中科院分区：
文献类型：
--
作者：
Xuefeng Bai;Yanhui Sun;Yimin Zhang
用抛光截面和电解提取法研究了Fe-20合金中添加Al和Ti过程中夹杂物的瞬时演化。添加Al后，Al基夹杂物随时间的演化经历了颗粒团聚、夹杂物漂浮和残留夹杂物缓慢减少三个主要阶段。在Ostwald熟化过程结束后，加入Al后，在浮动阶段结束时将钛丝送入钢中。添加钛后，在现有的Al_2O_3基夹杂物上很容易生成过渡相氧化钛，随着时间的推移，由于Al的还原作用，过渡相氧化钛消失。Al_2O_3与TiO_x之间的低失准度和局部的Ti过饱和度影响了瞬时TiO_x相的形成，而用高铬熔体中的Ti-O-N或Ti-Al-O平衡关系无法预测。加入钛后，由于[%Ti]和[%N]的局部过饱和，TiN与现有夹杂物伴生，并发现了单立方、孪生夹杂物和团簇三种类型的单个TiN。为了最大限度地减少过渡阶段富钛区的形成所造成的钛损失，应在添加钛之前通过搅拌促进Al_2O_3基大颗粒(包括集合体、团簇和花状夹杂物)的去除。添加钛后，布朗碰撞和湍流碰撞是影响小于2.7μm的颗粒碰撞的主要因素，大于该阈值的夹杂物的团聚主要以湍流碰撞和斯托克斯碰撞为主。
The transient evolution of inclusions during Al and Ti additions in a Fe-20 mass pct Cr alloy was investigated using polished cross sections and electrolytic extraction. After Al addition, the evolution of Al2O3-based inclusions based upon the area and particle size passed through the following three main stages with time: Particle agglomeration, inclusion floating, and a slow decrease of the remaining Al2O3-based inclusions. Titanium wire was fed into the steel at the end of the floating stage after Al addition when the Ostwald ripening process was finished. Immediately after Ti addition, the transient phase of Ti oxide was readily generated on the existing Al2O3-based inclusion and disappeared due to Al reduction as time progressed. The formation of the transient TiOx phase was affected by the low disregistry between Al2O3 and TiOx and the local Ti supersaturation, which cannot be predicted by the equilibrium relations of Ti–O–N or Ti–Al–O in the high-Cr-containing melt. Because of the local supersaturation of dissolved [%Ti] and [%N] shortly after Ti addition, TiN associated with existing inclusions and three types of individual TiN including single cubes, twinned inclusions, and clusters were identified. In order to minimize the Ti loss caused by the formation of Ti-rich zones during the transient stages, the removal of large Al2O3-based particles including aggregates, clusters, and flower-shaped inclusions should be promoted by stirring before Ti addition. After Ti addition, Brownian and turbulent were the major factors affecting the collision of particles smaller than the threshold of 2.7 μm. The agglomeration of inclusions larger than this threshold was mainly dominated by turbulent and Stokes’ collisions.
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影响因子：
1.8
作者：
Youn‐Bae Kang;Joo-Hyeok Lee
通讯作者：
Youn‐Bae Kang;Joo-Hyeok Lee
影响因子：
3.5
作者：
Min-Ki Sun;I. Jung;Hae-geon Lee
通讯作者：
Min-Ki Sun;I. Jung;Hae-geon Lee
DOI：
10.1007/s11663-009-9290-7
发表时间：
2009-09
期刊：
Metallurgical and Materials Transactions B
影响因子：
--
作者：
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通讯作者：
Congmin Wang;N. T. Nuhfer;S. Sridhar
影响因子：
1.8
作者：
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通讯作者：
K. Fujii;T. Nagasaka;M. Hino
DOI：
--
发表时间：
1968
期刊：
--
影响因子：
--
作者：
U. Lindborg
通讯作者：
U. Lindborg