钛含量对443超纯铁素体不锈钢凝固组织的影响  

Effect of Ti Content on Solidification Structure of 443 Ultra-Pure Ferritic Stainless Steel

作　　者：黄泽骅 HUANG Zehua(Gansu Jiu Steel Group Hongxing Iron&Steel Co.Ltd.,Jiayuguan 735100,China)

机构地区：[1]甘肃酒钢集团宏兴钢铁股份有限公司,甘肃嘉峪关735100

出　　处：《甘肃冶金》2024年第3期102-105,共4页Gansu Metallurgy

摘　　要：通过真空感应炉浇注不同钛含量的443超纯铁素体不锈钢铸锭,并分析研究不同钛含量对443超纯铁素体不锈钢铸锭凝固组织的影响。试验结果表明:443超纯铁素体不锈钢凝固过程中先从液相中析出高温铁素体,随着温度降低析出TiN和NbC。钛含量越高凝固组织的等轴晶率越高、晶粒尺寸越小,在[Ti]为0.3%时,铸锭组织全部为等轴晶,等轴晶率为100%,平均尺寸达到0.56 mm,晶粒球化率为0.85。The 443 ultrapure ferritic stainless steel ingots with different titanium contents were poured in a vacuum induction furnace.Effects of different Ti alloying elements on solidification structure in 443 ultra purified ferritic stainless steel were investigated and analyzed.The results show that high-temperature ferrite is first precipitated from the liquid phase,and TiN and NbC are precipitated as the temperature decreases during the solidification process of 443 ultra pure ferritic stainless steel.The higher the titanium content in 443,the higher the equiaxed grain rate and smaller the grain size of the solidified structure.When[Ti]is 0.3%,the microstructure of the ingot is entirely equiaxed,with an equiaxed grain rate of 100%,an average size of 0.56 mm,and a grain spheroidization rate of 0.85.

关 键 词：443超纯铁素体不锈钢 TI 凝固组织 等轴晶率 真空感应炉 

分 类 号：TG142.15[一般工业技术—材料科学与工程]