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为研究贝氏体相变温度对中碳热轧TRIP钢组织与性能的影响,采用扫描电镜(SEM)、X射线衍射(XRD)与高分辨透射电镜(HRTEM)对含Ti与Mo的中碳热轧TRIP钢进行了显微组织观察、残余奥氏体含量测定以及析出相的表征与分析.结果表明:在400℃贝氏体相变温度下,试验钢的残奥含量与强塑积均达到最大值,分别为28.2%和31.14 GPa·%;同时在钢中发现了呈块状、无规则形状以及片层状形貌分布的残余奥氏体,对衍射斑标定后显示,片层状残余奥氏体与铁素体基体同时满足kurdjumov-Sachs(K-S)与Nishiyama-Wasserman(N-W)位向关系;HRTEM分析显示,Mo可以溶入TiC而生成(Ti,Mo)C粒子,而纳米级的(Ti,Mo)C粒子可以显著提高钢的沉淀析出强化效果.
In order to study the effect of bainite transformation temperature on the microstructure and properties of hot-rolled TRIP steel, the carbon and carbon of Ti and Mo-containing mesocarbons were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and high resolution transmission electron microscopy (HRTEM) The microstructure of the hot-rolled TRIP steel, the determination of the residual austenite content and the characterization and analysis of the precipitated phase were studied.The results show that the content of the para-a-noxious phase Reaching the maximum value of 28.2% and 31.14 GPa ·%, respectively. At the same time, residual austenite with massive, irregular shape and lamellar topography was found in the steel. After the diffraction spot was calibrated, lamellar The residual austenite and ferrite matrix simultaneously satisfy the orientation relationship between kurdjumov-Sachs (KS) and Nishiyama-Wasserman (NW). HRTEM analysis shows that Mo can dissolve into TiC to form (Ti, Mo) The (Ti, Mo) C particles can significantly enhance the precipitation strengthening effect of steel.