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利用萃取复型,结合TEM和EDX技术,研究了超低碳Nb-Ti微合金钢中析出相粒子在1300℃保温后的回溶行为。结果表明,基体中存在两类析出相:一类为凝固过程中形成的比较粗大的析出相,另一类为应变诱导下产生的析出相,尺寸比较细小。凝固过程中形成的析出相中富Ti,应变诱导下的细小析出相富Nb。在1300℃回溶时应变诱导析出相不稳定,2 h后基本不存在,而凝固过程中形成的析出相在回溶48 h后,还存在含Nb的(Nb,Ti)(C,N)复合相。在钢中含Ti的情况下,Nb碳氮化物的稳定性大幅提高。
With the help of extraction complex type and TEM and EDX techniques, the dissolution behavior of precipitated particles in ultra-low carbon Nb-Ti microalloyed steel after heat preservation at 1300 ℃ has been studied. The results show that there are two types of precipitates in the matrix: one is the coarse precipitates formed during the solidification and the other is the precipitates formed under the strain induction, the size is relatively small. The precipitation phase formed in the solidification process is rich in Ti, and the small precipitates in the strain-induced phase are Nb-rich. At 1300 ℃, the strain-induced precipitation phase is unstable and basically absent after 2 h. However, the Nb, Nb, Ti (C, N) Complex phase. In the case of steel containing Ti, the stability of Nb carbonitride greatly improves.