Spheroidization of Sulfide in Sulfur Bearing Steels by Oxygen: An Experimental and First-Principle Investigation
摘要
The morphology of single-particle manganese sulfide (MnS) in sulfur bearing steel without oxygen is polyhedral, while it is spherical in the steel containing 70 ppm oxygen. Oxygen can dissolve in MnS to form oxysulfide (Mn(S,O)), the dissolution form of oxygen in MnS is both the substitutional and interstitial solution. The difference in the surface energies of Mn(S,O) is significantly smaller than that of MnS, this is the root cause for oxygen to spheroidize sulfides.