论文部分内容阅读
使用Gleeble-1500热/力模拟机,对四种V-N微合金非调质钢和一种非V-N微合金化对比钢进行了静态再结晶实验研究.研究结果表明:当钢中C质量分数为0.33%时,V-N微合金钢的静态再结晶要比未V-N微合金化的对比钢有明显滞后,尤以820～880℃温度范围内最为明显,因此钢中V析出物对道次间再结晶过程影响很大.进一步研究表明,V-N微合金非调质钢道次间静态再结晶量受C含量的影响并不呈简单线性关系:在760～880℃温度范围内,道次间静态再结晶量在钢中C质量分数为0.33%时均为极大值,而940℃下所有五种实验钢均完成了静态再结晶;钢中V析出物对道次间静态再结晶的影响机制相当复杂,与其析出时机关系很大.在此C含量下且V和Ti量均近似相同的V-N微合金实验钢中,发现当N质量分数从140×10-6增加到210×10-6时,该温度范围内道次间静态再结晶量下降14%～19%,N含量增加有明显抑制道次间静态再结晶的作用.
The static recrystallization experiments of four VN microalloy non-quenched and tempered steels and one non-VN microalloyed comparative steel were carried out using the Gleeble-1500 thermal / mechanical simulator.The results show that when the mass fraction of C in steel is 0.33 %, The static recrystallization of VN microalloyed steel is obviously lagging behind that of non-VN microalloyed comparative steel, especially in the temperature range from 820 ℃ to 880 ℃. Therefore, the recrystallization of V between steel and intergranular recrystallization And the influence is great.Further studies show that the static recrystallization of VN micro-alloyed non-quenched and tempered steel is not linearly dependent on the C content: within the temperature range of 760 ~ 880 ℃, the static recrystallization When the mass fraction of C in steel is 0.33%, the maximum recrystallization is achieved in all five kinds of experimental steels at 940 ℃. The influence mechanism of V precipitates in steel on static recrystallization in pass is very complex, Which has a great relationship with the timing of its precipitation.In the VN microalloyed experimental steel with similar C and Ti contents, it was found that when the N mass fraction increased from 140 × 10-6 to 210 × 10-6, the temperature Within the range of static recrystallization between the channels decreased by 14% to 19%, N content increased significantly inhibited Static recrystallization role.