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利用扫描电子显微镜(SEM),透射电子显微镜(TEM)和电子背散射衍射技术(EBSD)研究了热处理工艺对Q125级ERW石油套管用钢中组织和性能的影响。结果表明,实验钢采用870℃淬火+500℃回火调质处理后,其组织为典型的回火索氏体,组织内含有100～150 nm的细化马氏体板条,板条内部存在两类亚结构,一类是对提升韧性有利的位错胞状亚结构,另一类是对强度贡献较大的高密度、相互缠结的位错亚结构;在此工艺条件下,使得Q125石油套管钢的屈服强度为950 MPa,抗拉强度985 MPa,伸长率为18%,0℃冲击功为58 J,具备良好的综合力学性能,满足API的标准对钢板的要求。
The effects of heat treatment process on the microstructure and properties of Q125 ERW steel were investigated by scanning electron microscopy (SEM), transmission electron microscopy (TEM) and electron backscatter diffraction (EBSD). The results show that the microstructure of the experimental steel is tempered sorbite at 870 ℃ and tempering at 500 ℃. The microstructure of the experimental steel is composed of fine martensite lath of 100-150 nm and the internal of the lath Two types of sub-structures, one is the dislocation cellular sub-structure beneficial to improve toughness, and the other is high-density, intertwined dislocation sub-structure that contributes to the strength; under this process conditions, Q125 oil The yield strength of casing steel is 950 MPa, the tensile strength is 985 MPa, the elongation is 18% and the impact energy at 0 ℃ is 58 J, which has good comprehensive mechanical properties and meets the requirements of the API standard for steel plates.