标题：Variations of microstructure and properties of 690MPa grade low carbon bainitic steel after tempering
作者：Feng, R.;Li, S.;Li, Z.;Tian, L.
作者机构：Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials, Ministry of Education, Shandong University, Ji
来源：Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing
关键词：Electrical resistivity;Granular bainite;Low carbon bainitic steel;Retained austenite;Tempering
摘要：The variations of microstructure, mechanical properties and electrical resistivity of 690. MPa grade low carbon bainitic steel tempered at different temperatures were investigated with Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM) and double-arm Bridge. The results show that the appearance of granular bainite, decomposition of retained austenite, variations of dislocation density and solid solution of microalloying elements are the main reasons for variations of mechanical properties and electrical resistivity. Electrical resistivity reflects the solution content of microalloying elements and variations of dislocation density, which can be used as a fast and effective way to analyze the microstructure of materials.