In-situ observation of engulfment and pushing of nonmetallic inclusions in steel melt by advancing melt/solid interface
In-situ observation of engulfment and pushing of nonmetallic inclusions in steel melt by advancing melt/solid interface
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DOI：
10.2355/isijinternational.38.149
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发表时间：
1998-01-01
影响因子：
1.8
通讯作者：
Suzuki, M
中科院分区：
文献类型：
--
作者：
Shibata, H;Yin, HB;Suzuki, M
用共聚焦扫描激光显微镜原位研究了推进钢液/钢液界面对夹杂物颗粒的吞噬或推动作用。当推进界面的速度超过半径为R的颗粒的临界值V-c时，钢液中的固体氧化铝团簇颗粒或液态硅酸盐/铝酸盐球状颗粒被界面凸起吞没，形成向颗粒的凸起。在较低的速度或较小的半径下，两类中的粒子都由不形成凹凸的界面推动。对于固体氧化铝团簇，V-c(mum/S)=60/R(Mum)，而对于液体球形颗粒，V-c=23/R，尽管在相同R下，V-c与V-c相差不大。在传统的铸钢工艺中，颗粒间的夹杂引起的换热减少被认为是在V-C处经常遇到的凸起形成和吞没的原因。
Engulfment or pushing of inclusion particle by advancing melt/sold interface of steel has been investigated in-situ with a confocal scanning laser microscope. When the velocity of advancing interface exceeds a critical value V-c for a particle with radius R, solid alumina cluster particle or liquid silicate/aluminate globular particle in steel melt is found engulfed by the interface which extends in a convex way to form a bump toward the particle. At lower velocities or for smaller radii, the particles in both classes are pushed by the interface which does not form the bump. For solid alumina clusters, V-c(mu m/s)=60/R (mu m), whereas V-c= 23/R for the liquid globular particles, although V-c is not much different from V-c at same R. The shape of the bump is reasonably reproduced by a two-dimensional FEM analysis of heat transfer from the melt across the particle to the interface. Reduced heat transfer caused by the intervening particle is considered responsible for the bump formation and resulting engulfment at V-c usually encountered in conventional casting process of steel.