CAJ | 학술논문

利用Gleeble模拟技术研究了不同N含量和热加工工艺对N80无缝管(33Mn2V成分)的影响.结果显示,在各种工艺条件下,N含量从0.005%增加至0.014%或0.021%,在保持钢的强度提高的同时,钢的韧性也显著增加.进一步研究表明,当降低再加热温度时,钢的强度略微损失,韧性提高;而钢的中间停冷温度从450℃提高至700℃,工艺从在线常化变化为非在线常化,则使钢的强度有较大提高的同时韧性明显降低.无缝管的上述力学性能变化和V在钢中的溶解和析出行为以及相应的显微组织变化有直接关系.N含量的增加则优化了V(CN)的析出行为.
이용Gleeble모의기술연구료불동N함량화열가공공예대N80무봉관(33Mn2V성분)적영향.결과현시,재각충공예조건하,N함량종0.005%증가지0.014%혹0.021%,재보지강적강도제고적동시,강적인성야현저증가.진일보연구표명,당강저재가열온도시,강적강도략미손실,인성제고;이강적중간정랭온도종450℃제고지700℃,공예종재선상화변화위비재선상화,칙사강적강도유교대제고적동시인성명현강저.무봉관적상술역학성능변화화V재강중적용해화석출행위이급상응적현미조직변화유직접관계.N함량적증가칙우화료V(CN)적석출행위.
The synthesis effects of different nitrogen (N) contents and thermal processes on the micro-structure and mechanical properties of 33 Mn2V steel for N80-class seamless tube were investigated using Gleeble simulation technique. The results showed that when the N content in the steel increased from 0.005% to 0.014% or 0.021% , for in-line normalizing process, the strength of steel increased, and in the same time toughness of steel increased greatly. The further research showed that while the reheating temperature decreased, the strength of steel became lower slightly and the toughness of it improved. When the cooling-interrupted temperature of steel changed from 450℃ to 700℃, the process varied from in-line normalizing to non in-line, which made the strength of steel increased significantly and the toughness decreased evidently. This can be attributed to the dissolution and precipitation behavior of V (CN). The optimization of V (CN) precipitation can be achieved by the enhanced N.