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含硫易切削钢中硫化锰的热力学计算及试验研究
Thermodynamic Calculation and Experimental Study of MnS in Sulfur Containing Free-cutting Steel
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- DOI:
- 作者:
- 王英虎
WANG Yinghu
- 作者单位:
- 攀钢集团研究院有限公司 海洋装备用金属材料及其应用国家重点试验室
Pangang Group Research Institute Co.,Ltd.,Panzhihua 617000,China;State Key Laboratory of Marine Equipment Made of Metal Material and Application,Anshan 114009,China
- 关键词:
- 热力学计算 含硫易切削钢 THERMO-CALC软件 硫化锰
thermodynamic calculation sulfur containing free-cutting steel Thermo-Calc software manganese sulfide
- 摘要:
- 通过采用Thermo-Calc热力学计算与金相显微镜、扫描电镜、能谱仪及X射线衍射仪等试验研究相结合的方法研究了含硫易切削钢中主要合金元素对硫化锰析出温度的影响、含硫易切削钢相转变过程与硫化锰的形貌、成分及分布特征。研究结果表明,随着锰与硫元素含量增加,硫化锰的析出温度升高,当锰与硫元素含量过高时,硫化锰会在钢液中形核并析出,碳与铬元素含量变化对硫化锰的析出温度几乎没有影响;含硫易切削钢升温过程中的平衡相变依次为:铁素体转变为奥氏体→M23C6溶解→奥氏体转变为高温δ铁素体→δ铁素体转变为液相→硫化锰溶解→液相;硫化锰为浅灰色,大部分沿晶界分布,只有小部分在晶内析出,其形貌主要为纺锤形、长条形及球形。Thermo-Calc thermodynamic calculation and metallographic microscope,scanning electron microscope(SEM),energy spectrometer(EDS),X-ray diffractometer(XRD)and other experimental studies were used to study the effect of the main alloy elements in sulfur-containing free-cutting steel on the precipitation temperature of MnS,the phase transition process of sulfur-containing free-cutting steel and the morphology,composition and distribution characteristics of MnS.The results show that the precipitation temperature of MnS increases with the increase of manganese and sulfur content.When the content of manganese and sulfur is too high,MnS will nucleate and precipitate in molten steel.The content of carbon and chromium has little effect on the precipitation temperature of MnS.The equilibrium phase transitions of sulfur-containing free-cutting steel during the heating process are successively as follows:ferritic transformation to austenite,M23C6 dissolution,austenite transformation to high temperature ferrite,ferrite transformation to liquid phase,manganese sulfide dissolution,liquid phase;MnS color is light gray,mostly distributed along grain boundaries,only a small part precipitated in grain,its morphology is mainly spindle shape,elongated and spherical.