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对控轧控冷态60 mm厚的E550海洋工程用钢分别进行860、890、930℃的奥氏体化淬火,650℃的回火,使用扫描电子显微镜和电子背散射衍射技术对热处理后钢板的组织和力学性能进行研究。结果表明:调质处理钢板的屈服强度随着淬火温度的升高不断增加,而抗拉强度和伸长率基本保持不变。860℃淬火后的组织细小均匀,晶内有大量小角度晶界存在,冲击吸收能量在188～335 J之间;890℃淬火,晶粒尺寸有所增加,且晶粒间多以大角度晶界为多;930℃淬火,由于温度较高,相邻奥氏体晶粒间出现相互吞并生长现象,冲击吸收能量很不稳定,最低仅为20 J。
Controlled rolling and control of cold 60 mm thick steel for marine engineering E550 were 860,890,930 ° C austenitizing quenching, 650 ° C tempering, the use of scanning electron microscopy and electron backscatter diffraction of heat-treated steel The organization and mechanical properties of the study. The results show that the yield strength of quenched and tempered steel increases with the increase of quenching temperature, while the tensile strength and elongation remain basically unchanged. After quenching at 860 ℃, the microstructure is fine and uniform. There are a large number of small-angle grain boundaries in the grain, and the impact energy is absorbed between 188 and 335 J. The quenching at 890 ℃ increases the grain size, Due to the high temperature, the mutual austenite grain growth phenomenon appears, the impact absorption energy is very unstable, the lowest is only 20J.