铝含量对TWIP钢中夹杂物特征及AlN析出行为的影响

发布时间：2018-04-10 09:02

  本文选题：TWIP钢　切入点：铝含量　出处：《工程科学学报》2017年07期

【摘要】：采用扫描电镜、X射线能谱仪以及扫描电镜配置的夹杂物自动扫描统计软件(INCAFeature)表征了Fe-Mn-C(-Al)系TWIP钢中夹杂物的成分、形貌和数量,考察了Al质量分数在0.002%~1.590%的四种TWIP钢中夹杂物的特征和Al含量对AlN析出行为的影响.并在此基础上,采用了适合TWIP钢中高锰高铝特点的热力学参数对AlN夹杂物进行了系统的热力学分析.研究表明,在含有相似N质量分数(0.0078%~0.0100%)的TWIP钢中,当钢中Al质量分数升高至0.75%时,AlN夹杂物开始在钢中析出,并在MnS(Se)-Al_2O_3上局部析出形成MnS(Se)-Al_2O_3-AlN复合夹杂;当Al质量分数升高至1.07%时,热力学计算表明AlN已经可以在TWIP钢液相中形成,经不断长大后在MnS(Se)夹杂物表面局部析出形成MnS(Se)-AlN复合夹杂物;在Al质量分数为1.59%的TWIP钢中,AlN的平衡析出温度比其液相线温度高出42℃,在液相中形成的AlN可以作为异质核心,MnS(Se)夹杂在其表面包裹形成MnS(Se)-AlN复合夹杂物.另外,在Fe-18.21%Mn-0.64%C-1.59%Al体系的TWIP钢中,AlN在液相中析出所需的最低氮的质量分数仅为0.0043%.因此,在TWIP钢的冶炼过程中,应尽可能的降低钢中的氮含量,避免生成过量的AlN夹杂.
[Abstract]:The composition, morphology and quantity of inclusions in Fe-Mn-Ca-Al TWIP steel were characterized by scanning electron microscopy (SEM) and scanning electron microscope (SEM) automatic scanning statistical software (Inca feature).The characteristics of inclusions in four kinds of TWIP steels with Al content of 0.002% and 1.590% Al content and the effect of Al content on the precipitation behavior of AlN were investigated.On this basis, the thermodynamic parameters suitable for high manganese and high aluminum in TWIP steel were used to analyze the inclusion of AlN systematically.The results show that in TWIP steel containing similar N mass fraction (0.0078 / 0.0100), when the Al content in the steel increases to 0.75, the AlN inclusions begin to precipitate in the steel and locally precipitate on the MnS(Se)-Al_2O_3 to form MnS(Se)-Al_2O_3-AlN composite inclusions, and when the Al mass fraction increases to 1.07%,The thermodynamic calculation shows that AlN can be formed in the liquid phase of TWIP steel, and after growing up, MnS(Se)-AlN compound inclusions can be formed by local precipitation on the surface of MNS See inclusions.The equilibrium precipitation temperature of AlN in TWIP steel with 1.59% Al content is 42 鈩，

本文编号：1730556