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中文摘要：
针对EQ70海洋平台用钢实际生产条件及存在问题,采用Gleeble-1500热模拟试验机测定了EQ70海洋平台用钢动态连续冷却转变膨胀曲线,再结合金相组织观察和显微硬度测定,获得EQ70海洋平台用钢动态连续冷却转变曲线。结果表明:冷速为0.05℃/s时,试验用钢的组织为粒状贝氏体以及少量的铁素体;冷速在0.1℃/s到1℃/s之间组织主要为粒状贝氏体和板条贝氏体;冷速为2℃/s时,组织为板条贝氏体和少量马氏体;随着冷速增加,马氏体的含量逐渐增多,冷速在8℃/s以上时,组织全部为马氏体。
英文摘要：
Dynamic continuous cooling transformation curves of EQ 70 steel for offshore platform were measured based on Gleeble-1500 thermal mechanical simulator coupling with microstructure observation and Vickers hardness measurement .The results show that the microstructure with granular bainite and small amount of ferrite is obtained at the cooling rate of 0.05℃/s.Microstructure mainly consists of granular bainite and lath bainite when the cooling rate ranges between 0.1 ℃/s and 1 ℃/s.Martensite begins to appear as the cooling rate is 2 ℃/s, the volume fraction of martensite increases with the cooling rate increasing , when cooling rate is up to 8℃/s, the microstructure is completely martensite .
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