Effect of titanium on sulfide in a sulfur-containing steel
The effect of titanium on sulfide inclusions in 42CrMoS4 sulfur-containing steel was investigated.The sulfides were characterized by SEM,EDS and ASPEX.The three-dimensional morphology of the sulfides was characterized by electrolysis experiment.With the increase of Ti content,the number of pure MnS decreased and the number of MnS-TiN composite inclusions increased.When the mass fraction of Ti was 309 × 10-6,Ti4C2S2 sulfide precipitated.The trajectory for the evolution of sulfides in the steel was:MnS→MnS-TiN→Ti4C2S2.The size of Ti4C2S2 was obviously smaller than that of MnS and MnS-TiN,and the deformation resistance of Ti4C2S2 was obviously stronger than that of MnS and MnS-TiN.With the increase of Ti content,the number density of sulfides first increased and then decreased,and the size of sulfides first decreased and then increased.When the mass fraction of Ti was 400×10-6,the number density of sulfide was the largest and the average size was the smallest.For 42CrMoS4 sulfur-containing steel,the optimized mass fraction of Ti element was 400×10-6.
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