摘要
利用V-N微合金化技术,在Q345钢基础上进行V-N微合金化,将通用型正火容器用钢的强度水平由345 MPa升级至400。MPa。考察了不同N含量对正火型V-N钢组织和强化效果的影响。结果表明,随着N含量增加,正火态V微合金化试验钢的屈服强度明显提高;每加入50×10^(-6)的N,屈服强度提高18MPa左右,同时屈强比上升。随着N含量提高,V微合金化钢产生明显的晶粒细化效果,试验钢的铁素体晶粒尺寸由13.36μm逐渐细化至7.89μm。对比热轧态试验钢和正火态试验钢的强化效果,发现正火态试验钢的析出强化作用相对较弱,而细晶强化作用相对显著。
Based on the chemical composition of the Q345 C-Mn steel, 400 MPa-grade pressure vessel steel which was in- creased from 345 MPa was designed by the V-N microalloyed technology. Gradually increasing N content was added in the experimental steels in order to investigate the influence of N content on the microstructure and strengthening effect. The results show that the yield strength as well as yield ratio is improved significantly with the addition of N content. Ev- ery 50 × 10-6 N content will result in a 18 MPa yield strength increase in normalized experimental steels. With increasing N content, the average size of ferrite is refined from 13.36 μm to 7.89 μm. Compared with the hot-rolled experimental steels, the normalized steels have a better refine-grain strengthening effect but a weakening of precipitation strengthening effect.
出处
《钢铁》
CAS
CSCD
北大核心
2014年第6期85-90,共6页
Iron and Steel
关键词
V-N微合金化
正火
强化效果
屈强比
V-N microalloyed
normalized
strengthening effect
yield rate
