研究F550级船板钢在820、850和910℃淬火，600℃回火条件下的热处理工艺对其低温韧性的影响。通过光学显微镜、扫描电子显微镜（SEM）、透射电子显微镜（TEM）等实验方法，分析了组织中多边形铁素体以及M／A岛体积分数、M／A岛的形貌、尺寸及分布情况。结果表明：选择在亚温区850℃淬火后600℃回火试验钢的-80℃低温韧性最佳，达到220J左右。在完全淬火区910℃淬火后回火，钢的主要组织为贝氏体，且大于2μm的M／A岛数量较多，这些M／A岛在晶间聚集或呈细条状或点列状分布在贝氏体铁素体板条间，这对钢的韧性起到破坏作用。经亚温处理后实验钢的组织为多边形铁素体和粒状贝氏体，铁素体细小且弥散分布。粒状贝氏体中的M／A岛体积分数较完全淬火低，且呈细小圆点状，弥散分布在贝氏体铁素体板条间，可以有效的阻止裂纹的扩展。
Microstructure and mechanical properties of F550 ship plate steel after guenching at 820 ℃ ,850 ℃ ,910 ℃ and tempering at 600 ℃ were investigared. The effects of quenching temperature on low temperature toughness of F550 ship plate steel were examined. The morphology, size and distribution of martensite-austenite (M/A) constituents and the volume fraction of M/A islands and polygonal ferritc obtained after different heat treatment processes were observed by optical microscope, scanning electron microscopy (SEM) , transmission electron microscopy (TEM) and quantitative metallographie methods. The results show that after intereritical quenching at 850 ℃ and tempering at 600℃ , the low temperature toughness at -80 ℃ of the steel is the best, which is about 220 J. After complete quenching at 910 0C and tempering at 600 ℃ , the main mierostrueture of the steel is bainite, and the amount of M/A islands with the size above 2 ~m increases and the M/A islands are distributed at grain boundaries or between bainitic ferrite lathes with the form of elongated block and dots, which lead to the decrease of toughness. After sub-critical heat treatment, the microstructure consists of polygonal ferrite (QF) and granular bainite, and polygonal ferrite is fine and distributed uniformly. The amount of M/A islands is smaller compared with that of complete quenching and tempering, and the M/A islands with dot-shape disperse uniformly between bainitic ferrite lathes acting as effective barriers to crack propagation.
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