摘要:
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.
Abstract:
The Gleehle-1500 thermal/mechanical simulator was used to study static recrystallization in four non-quenched/tempered steels with V-N-microalloying and one non-microalloying base steel. The results show that in the V-N microalloved steel with 0.33% C, the static recrystallization process was retarded markedly in comparison with that in the non-mlcro,alloying steel with the same C content, especially in the range of 820 to 880℃. However, the relationship between C content and static recrystallization was not linear for the microalloyed steels studied. Compared that for the steels with lower or higher C contents, the inter-pass static recrystallization amounts in the 0.33% C steel were always the maximum within the temperature range of 760 to 880℃, though all the five tested steels completed static recrystalllzation under 940℃. Such results indicated that the effect of V-contalning precipitates on the inter-pass static recrystallization process was fairly complex and depended on when the precipitation occurs. When the mass fraction of N increased from 140×10-6 to 210×10-6 and the other compositions were almost the same, the inter-pass static recrystallization amount decreased by 14% to 19% in the temperature range of 820 to 860℃;, showing that the increase of N content would restrain static recrystallization obviously.
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