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Abstract For the purpose of investigating tellurium on the morphology of MnS in steel，aiming at Y15 high sulfur free-cutting steel， using scanning electron microscopy， combined with FactSage thermodynamic calculation， the effect of tellurium on morphology， size and aspect of MnS inclusions in steel was studied and the controlling mechanism of scattered metals tellurium in the morphology of MnS inclusions was discussed.The results show that， after tellurium added into liquid steel，the compound which is identified as complex phase containing Fe， Mn and Te by elementmapping forms. The morphology and distribution of MnS changes significantly by adding Te into liquid steel.MnS inclusions of chain shapearegreatly reduced and quantities of globular MnS inclusions increase when the ratio of Te content to S content reaches 0.05. MnS inclusions of chain shape almost entirely disappear when the ratio of Te content to S content reaches 0.2， andthe change of MnS inclusions morphologyis no longer obvious when[w(Te)/w(S)]reaches 0.5. The aspect of MnS inclusions reduces significantly by adding Te into liquid steel and the best ratio to control MnS inclusions is 0.2. FactSage calculation shows that the formation temperature of MnTe is 1 900 ℃.Solid solution occurs between MnS and MnTe during solidification. Solid solution growsspherical because of liquid MnTe.
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Received: 09 January 2017
Published: 07 September 2017
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2017, Vol. 52 
