【摘要】 将Fe-0.05C-1.3Mn-0.35Ni-0.3Si-0.25Mo超低碳钢在850℃压缩变形后,分别进行了高温停留+直接冷却、高温停留+等温、直接等温和直接冷却等4种处理,研究了不同方式处理后试验钢的物相组成、显微组织和硬度,分析了高温停留对该钢中温相变的影响。结果表明:与直接冷却处理相比,高温停留使试验钢的中温相变易于发生和进行,且钢的硬度水平较高;高温停留处理使变形形成的位错纠缠变成位错胞结构,有利于束状贝氏体的形成,致使试验钢的硬度提高。更多还原

【Abstract】 The Fe-0.05C-1.3Mn-0.35Ni-0.3Si-0.25Mo ultra-low carbon steel was compression deformed at 850 ℃,and then treated by 4 different ways of high-temperature staying+direct cooling,hightemperature staying+isothermal treating,direct isothermal treating and direct cooling,respectively.The phase composition,microstructure and hardness of the tested steel after different treatments were studied,and the influence of high-temperature staying on the intermediate-temperature phase transformation characteristic of the steel was analyzed.The results show that comparing to the direct cooling treatment,the intermediate-temperature phase transformation of the tested steel occurred and continued more easily due to the high-temperature staying and the hardness of the steel was relatively high.The high-temperature staying treatment transformed the dislocation entanglement produced during the deformation into the dislocation cell structure,which was benefiting for the formation of sheaf-like bainite,resulting in the increase of hardness of the tested steel.更多还原