微合金元素Nb,Mo在应变诱导析出过程中的相互作用

Interaction Between Micro-alloyed Element of Nb and Mo During Strain-induced Precipitation

运用热模拟技术和透射电子显微镜,研究了C-Mo、C-Ti-Mo和C-Nb-Mo三种简单成分钢奥氏体变形后松弛过程中微合金元素Nb、Mo在析出物中的相互作用。结果表明:在850℃变形后松弛1000s,三种钢均保持了奥氏体状态,但C-Ti-Mo和C-Nb-Mo钢有析出发生,能谱分析显示析出颗粒分别是Ti(C,N)和含Mo的Nb(C,N)。微合金元素Mo与Nb有较强的相互作用,在Nb(C,N)析出后,Mo可能溶入Nb(C,N)的析出颗粒之中。

Using the thermo-simulation test and transmission electron microscopy （TEM）, the interaction between the micro-alloyed element Nb and Mo in the precipitates during relaxation after austenite deformation for C-Mo, C-Ti-Mo steel and C-Nb-Mo steel was investigated. The experiment results show that the austenite state is preserved in three kinds of steels relaxed for 1000 s after deforming at 850℃. But strain-induced precipitate occurs in C-Ti-Mo steel and C-Nb-Mo steel. The energy spectrum analysis shows that the precipitated particles are Ti（C, N） and Mo-containing Nb（C, N）, there is strong interaction between Mo and Nb in the precipitates. The element Mo enters the matrix of Nb（C, N） particles probably after Nb（C, N） formation.