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采用金相法、相分析、X射线衍射技术,定量研究了不同钛含量的微合金高强钢加热温度及保温时间对奥氏体晶粒长大尺寸的影响,以及其析出特性对力学性能的影响。结果发现,当加热温度达1 000~1 150℃时,在保温时间相同时,B钢奥氏体晶粒尺寸小;但当温度升高到1 150℃以上时,B钢奥氏体晶粒尺寸快速增大,粗大的含钛颗粒对奥氏体晶粒长大几乎无阻碍作用。随钢中钛含量增加,A、B钢中的MC析出相的量分别占M3C相析出总量的7.5%、159.0%(质量分数,下同)。MC与M3C的质量比增大,则其对应钢的强度值也增大。A、B钢中10nm以下的析出相质量分数分别为2.2%、21.7%。
The effects of heating temperature and holding time of austenite with different Ti content on the grain size of austenite were studied quantitatively by metallographic method, phase analysis and X-ray diffraction. The influence of precipitation and heating on the mechanical properties was also investigated. The results show that the austenite grain size of B steel is small when the heating temperature is up to 1 000-1 150 ℃, but the austenite grain size of B steel is small when the heating temperature is above 1 150 ℃. Rapid increase in size, coarse titanium particles on the austenite grain growth almost unimpeded effect. With the increase of titanium content in steel, the amount of MC precipitated phase in A and B steel accounts for 7.5% and 159.0% of the total precipitated amount of M3C phase, respectively (mass fraction, the same below). The mass ratio of MC to M3C increases, and the strength value of the corresponding steel also increases. The mass fraction of precipitates below 10nm in A and B steel were 2.2% and 21.7% respectively.