摘要
通过热力学计算和试验,研究了钛合金化后高硼钢含钛析出相在液相和凝固过程中的析出规律,采用光学显微镜(OM)、扫描电镜(SEM)、X射线衍射仪(XRD)研究了高硼钢的凝固组织。研究结果表明不加钛的合金铸态组织由硼化物、铁素体、珠光体组成,钛合金化后铸态组织由第二相TiC、硼化物和铁基体组成;热力学计算结果表明含钛析出相均不可能在液相中析出,TiC在凝固的过程中析出,析出温度为1 691 K,析出时的凝固分数为29%,析出相的析出顺序为TiC>TiB2>TiB。
The precipitation behavior of the titanium-containing precipitated phases of titanium-alloyed high boron steel in liquid phase and during solidification has been studied by thermodynamic calculation and experiments. Solidification microstructures of the high boron steel were researched by means of optical microscope （ OM ） , scanning electron microscope （ SEM ） , X-ray diffractometer （ XRD ）. The results show that the solidification microstructures of cast alloy without alloying with Ti consist of boride, ferrite, and peadite, and boride successively distributes along grain boundary in reticular form, while the micro- structures of titanium-alloyed cast alloy consist of second-phase TiC, boride and matrix. Thermodynamic calculation results show that the titanium-containing precipitated phases cannot precipitate in the liquid phase; TiC can precipitate at 1691K when the solidification volume fraction reaches 29% during its solidification, and the precipitation sequence of the precipitated phases is TiC 〉 TiB2 〉 TiB.
出处
《钢铁钒钛》
CAS
北大核心
2014年第1期41-47,共7页
Iron Steel Vanadium Titanium
关键词
高硼钢
钛合金化
凝固组织
TiC
TIB2
TIB
high boron steel, titanium alloying, solidification microstructure, TiC, TiB2, TiB
