摘要
The effect of adding MgO nanoparticles(0%,0.01%,0.05%,and 0.10%)on the inclusion and acicular ferrite(AF)formation in 1.8%Ni low carbon Al-killed(LCAK)steel was explored.The inclusion analysis reveals that MgO nanoparticles react with dissolved Al or Al_(2)O_(3)inclusions and finally change to fine MgAl_(2)O_(4)wrapped by MnS in the case of adding 0.05%Mgo nanoparticles.In contrast,Mgo nanoparticles are agglomerated and form Mg-bearing inclusion clusters in the case of 0.10%or reduced to high Al_(2)O_(3)inclusions by dissolved Al in the case of 0.10%.The microstructure observations show that the AF formation was promoted in the case with addition of 0.05%Mgo nanoparticles.The process of inclusion-inducing AF nucleation is essentially characterized via the high-temperature confocal scanning laser microscopy experiment.δ_(min)(δdenotes disregistry)of Al_(2)O_(3)/α-Fe,MgAl_(2)O_(4)/α-Fe,and MnS/α-Fe is evaluated to be 11.5%,6.5%,and 7.4%,respectively.The high AF fraction in the case of 0.05%MgO addition can be attributed to the low disregistry of MnS–MgAl_(2)O_(4)/ferrite and Mn-depleted zone adjacent to the MnS layer.Based on the results,0.05%was recommended as the proper addition amount of MgO nanoparticles in 1.8%Ni LCAK steel.
基金
This work was supported by the National Natural Science Foundation of China(No.52074075)
The authors would like to express their gratitude to EditSprings(https://www.editsprings.cn)for the expert linguistic services provided
The authors are grateful to Si-tong Liu for assistance with graphic design.
