【摘要】 通过分析控轧控冷F40级船板钢在400~750℃重加热不同温度保温1h过程中的性能变化,结合金相组织、扫描电镜和透射电镜观察,研究了钢板在重加热过程中的组织演化过程及其热稳定性机理。结果表明,F40级船板钢的硬度值随重加热温度的升高呈现先降低后增加至出现硬化峰,然后再降低的过程;钢板重加热前的组织为准多边形铁素体和针状铁素体复合组织,重加热温度升至600℃保温1h后组织变化不很明显,随着重加热温度的逐步升高,针状铁素体逐渐消失并最终演化成多边形铁素体。因此F40级船板钢在600℃以内热加工时具有较好的组织热稳定性。更多还原

【Abstract】 The mechanical properties of F40 hull structure steel processed by thermo-mechanical controlling process(TMCP) and reheating at 400~750 ℃ and holding for 1 h were investigated.The structure evolution and thermal stability mechanism of the steel during reheating process were studied by OM,SEM and TEM.It was found that the hardness variety decreased prior and then increased up until emerging the hardening peak.The microstructure of the steel before reheating are the quasi-polygonal and the acicular ferrite mixed structure,after the temperature rising higher than 600 ℃ for 1h the structure variety is not obvious.With the reheating temperature raising the acicular ferrite gradually disappear and at last turns to polygonal morphology.Therefore,the F40 hull structure steel hot processed at lower 600 ℃ can still hold better structure stability.更多还原