Effect of Titanium Oxide on Phase Transformation for Low Alloy High Strength Steel Welds
Aimed at improving mechanical properties of high strength low alloy steel welds,oxides with high melting point and high stability were added into steel liquid.By thermodynamics calculation and thermal simulating technology,phase transformation characteristics of low alloy steel weld with TiO2 addition were investigated.The results showed that TiO2 added in welds led to the decrease of phase transformation temperature and the wideness of γ→α transformation temperature range.The starting and finishing transformation temperature of ferrite respectively dropped about 311K and 486K on the cooling condition of 373K/s.Moreover,the complex inclusions of TiOx-MnO-SiO2-MnS with spherical shape and 0.67μm mean size formed in weld metal.In addition,only acicular ferrite existed in the titanium oxide added welds.So it was concluded that titanium oxide can effectively be used to control phase transformation and then achieve fine and favorable microstructure.
Low Alloy Steel Titanium Oxide Phase Transformation Complex Inclusion Acicular Ferrite
Cui Xin Chen Hui Fen Peng Pu Zhao Yuan Yuan Li Liang Yan
School of Materials science and Engineering, Hebei University of Technology, Tian Jin, 300130,China
国际会议
广州
英文
92-96
2012-11-16（万方平台首次上网日期，不代表论文的发表时间）