摘要
采用不同V系、V-Ti系微合金化成分设计的Q420C级电力角钢进行工业试制,并进行力学性能检验、金相分析、JMatPro以及电解化学相分析。结果表明,V-Ti微合金系,Ti元素全部析出,Ti先与N结合生成TiN,钢中剩余的N含量较少,降低了V的析出驱动力,导致V元素析出率较低,析出率仅约30%;Ti的加入改变了V的析出形式,部分V在TiN上形核长大,粗化了析出相尺寸,析出物尺寸大多大于20 nm,其析出物基本上不起析出强化作用,V-Ti系角钢的析出强化效果不及V系角钢。通过研究和构建角钢多元纳米相的层次化析出与竞争析出理论基础,为电力角钢成分设计及工艺控制提供理论依据。
The Q420C power angle steel is designed and produced with different V series and V-Ti series microalloying compositions.The mechanical property inspection,metallographic analysis,JMatPro and electrolytic chemical phase analysis are carried out.The results show that in V-Ti microalloy system,all Ti elements are precipitated.Ti first combines with N to form TiN,and the remaining N content in steel is less,which reduces the precipitation driving force of V and results in a lower precipitation rate of V element with only about 30%.The addition of Ti element changes the precipitation form of V,and some V nucleates and grows on TiN,which increases the size of precipitation phase.Most of the precipitates are larger than 20 nm and the precipitation basically does not play a role in precipitation strengthening.The precipitation strengthening effect of V-Ti angle steel is not as good as that of V angle steel.The theoretical basis of hierarchical precipitation and competitive precipitation of multi-element nano phase of angle steel is studied and constructed,which can provide theoretical basis for composition design and process control of power angle steel.
作者
韩伏
文辉
朱守欣
王得炯
邓伟
HAN Fu;WEN Hui;ZHU Shouxin;WANG Dejiong;DENG Wei(Nanjing Iron and Steel Co.Ltd.,Nanjing 210035,China)
出处
《现代交通与冶金材料》
CAS
2023年第1期58-64,共7页
Modern Transportation and Metallurgical Materials
关键词
角钢
V-Ti微合金化
析出率
析出强化
力学性能
angle steel
V-Ti microalloyed
precipitation rate
precipitation strengthening
mechanical property
