TY - JOUR
T1 - Effect of environmental oxygen content on the oxide inclusion in laser solid formed AISI 420 stainless steel
AU - Song, Menghua
AU - Lin, Xin
AU - Liu, Fenggang
AU - Yang, Haiou
AU - Huang, Weidong
N1 - Publisher Copyright:
© 2015 Elsevier Ltd.
PY - 2016
Y1 - 2016
N2 - A series of AISI 420 stainless steel samples were deposited under different oxygen partial pressures. The morphology, composition, size distribution and number density of the oxide inclusion were examined. Based on the thermodynamic calculation, the transformation process of the oxide inclusion was analyzed. Under air, the oxide inclusion comprised the angular spinel and allotriomorphic or globular compound oxide of spinel and silicate with large size. With decreasing the environmental oxygen content, the oxide inclusion became the globular oxide of mainly silicate with finer and more uniform size. The decrease of the O content in the sample mainly resulted in the decrease of the number density of the oxide particle but not the size. It is found that the oxide inclusion characteristics are determined mainly by the precipitation and solidification of the slag before and after the solidification of the liquid metal respectively. The size distribution of the oxide particle is dominated by the nucleation behavior when the O content is relatively low, while by the collision-coalescence behavior when the O content is high enough. The thermodynamic calculation can predict the oxide inclusion transformation reasonably for laser solid forming AISI 420 stainless steel.
AB - A series of AISI 420 stainless steel samples were deposited under different oxygen partial pressures. The morphology, composition, size distribution and number density of the oxide inclusion were examined. Based on the thermodynamic calculation, the transformation process of the oxide inclusion was analyzed. Under air, the oxide inclusion comprised the angular spinel and allotriomorphic or globular compound oxide of spinel and silicate with large size. With decreasing the environmental oxygen content, the oxide inclusion became the globular oxide of mainly silicate with finer and more uniform size. The decrease of the O content in the sample mainly resulted in the decrease of the number density of the oxide particle but not the size. It is found that the oxide inclusion characteristics are determined mainly by the precipitation and solidification of the slag before and after the solidification of the liquid metal respectively. The size distribution of the oxide particle is dominated by the nucleation behavior when the O content is relatively low, while by the collision-coalescence behavior when the O content is high enough. The thermodynamic calculation can predict the oxide inclusion transformation reasonably for laser solid forming AISI 420 stainless steel.
KW - AISI 420 stainless steel
KW - Environmental oxygen content
KW - Laser solid forming
KW - Oxide inclusion
KW - Thermodynamic calculation
UR - http://www.scopus.com/inward/record.url?scp=84952361345&partnerID=8YFLogxK
U2 - 10.1016/j.matdes.2015.11.003
DO - 10.1016/j.matdes.2015.11.003
M3 - 文章
AN - SCOPUS:84952361345
SN - 0264-1275
VL - 90
SP - 459
EP - 467
JO - Materials and Design
JF - Materials and Design
ER -