高强度船板抗应变时效敏感性研究

Study on Strain-aging Sensibility of High Strength Ship Plate

采用夏比冲击法测定了热轧、热轧+正火及TMCP 3种工艺下EH36高强度船板的应变时效敏感性,通过金相显微镜、透射电镜等观察了显微组织、精细结构和二相粒子析出形貌。结果表明,TMCP工艺下所获得的细化的F+P显微组织和大量细小弥散析出的二相粒子,减少了碳、氮间隙原子固溶,并阻碍了它们的扩散,使高强船板具有优良的低温韧性和抗应变时效敏感性。

The strain-aging sensibility of EH36 high strength ship plates is measured by Sharp impact method under conditions of three kinds of rolling technologies such as hot rolling, hot rolling with normalizing treatment as well as TMCP. Then the microstructures, fine structures and the precipitation morphology of two-phase particles are observed and analyzed by metallographic microscope and transmission electron microscope. Analytical results show that the microstructures of refined ferrite and pearlite and a large amount of fine dispersing precipitated two-phase particles can be obtained by TMCP technology, which can reduce the amount of solid solution of interstitial atoms such as carbon and nitrogen and their diffusing is blocked so that high strength ship plates are excellent in low temperature toughness and resistant strain-aging sensibility.