论文部分内容阅读
采用光学显微镜、扫描电镜、透射电镜、物理化学相分析等方法并结合热力学计算,分析了CSP工艺生产的钛微合金化高强钢的析出物特征及析出规律.研究发现:屈服强度700 MPa级高强钢中存在大量球形的纳米级Ti C和Ti(C,N)粒子及少量不规则形状、100 nm以上的Ti4C2S2粒子,Ti N在连轧前完成析出,Ti C主要在卷取和空冷时析出.不含钼钢和含钼钢(0.1%Mo)中MC相的质量分数为0.049%和0.043%,由于钼的加入,含钼钢中Ti的析出量较少,但析出粒子更为细小,并定量得到了不含钼钢和含钼钢的析出强化效果分别为126 MPa和128 MPa.
The precipitation characteristics and precipitation regularity of titanium microalloyed high strength steel produced by CSP process were analyzed by optical microscopy, scanning electron microscopy, transmission electron microscopy, physical chemical phase analysis and thermodynamic calculation. It was found that the yield strength of 700 MPa grade high strength A large number of spherical nano-sized TiC and Ti (C, N) particles and a small amount of irregular TiN4S2S2 particles with a size of over 100 nm exist in the steel. TiN is precipitated before the tandem rolling. TiC mainly precipitates during coiling and air cooling . The mass fraction of MC phase in the molybdenum-free steel and molybdenum-containing steel (0.1% Mo) is 0.049% and 0.043%, the amount of Ti precipitated in the molybdenum-containing steel is smaller due to the addition of molybdenum, The quantitative results of precipitation strengthening of non-molybdenum steel and molybdenum-containing steel were 126 MPa and 128 MPa, respectively.