Abstract: The effect of 0.01%~0.22%V on relax resistance,mechanical properties and precipitated phase of Si- Mn   spring   steels(0.34~0.53C,1.06~1.24Si,1. 17~1.36Mn)with   870～900℃  normalizing,900~920   ℃  quenching and 400~460 ℃ tempering has been studied by Bauschinger test and transmission electron microscope examination.  Results showed that with increasing austenitizing temperature at 870~920 ℃,the strength of steel increased; with adding vanadium in steel the area of relax loop and relax resistance of steel increased; and the available vanadium content in steel  was 0.05%~0. 10% which had obvious precipitates of second phase in steel and the second phase particle in 0.06%V steel was fine.

Key words: Vanadium,Si-Mn Spring Steel,Mechanical Properties,Relax Resistance

摘要： 采用包辛格试验方法和透射电镜研究了0.01%～0.22%V对870～900℃正火,900～920℃淬火,400～460℃回火Si-Mn弹簧钢(%:0.34～0.53C、1.06～1.24Si、1.17～1.36Mn)的松弛抗力、力学性能和析出相的影响。结果表明,在870～920℃随奥氏体化温度增加,钢的强度增加;添加钒能增加钢的滞后环面积和钢的松弛抗力;钢中较合适的钒含量为0.05%～0.10%,含钒钢中有明显第二相粒子析出,0.06%V钢中析出第二相粒子细小。

关键词: 钒, Si-Mn弹簧钢, 力学性能, 松弛抗力