0Cr13不锈钢连铸坯高温物理性能研究
Study on Physical Properties of 0Cr13 Stainless Steel Continuous Casting Billet at High Temperature
刘洪军, 吴 鑫, 李亚敏
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作者单位：(兰州理工大学 有色金属合金及加工教育部重点实验室, 甘肃 兰州 730050)
中文关键字：高温物理性能； 0Cr13不锈钢； 热分析； 组织
英文关键字：physical properties at high temperature; 0Cr13 stainless steel; thermal analysis; microstructure
中文摘要：为了制定合理的连铸工艺，减少连铸坯边裂缺陷的发生，分别采用热膨胀分析仪和同步热分析仪测试了0Cr13铁素体不锈钢连铸坯的高温性能，并对其在950～1300 ℃的相变行为进行了研究。热膨胀分析表明，0Cr13不锈钢从室温到1200 ℃升温过程中热膨胀曲线是非线性的；DSC分析表明，0Cr13不锈钢在849～890 ℃存在一明显的晶型转变；高温相变研究表明，0Cr13不锈钢在950 ℃的高温组织基本为奥氏体；当温度大于1150 ℃时高温奥氏体含量迅速减少，1300 ℃时基体组织基本为铁素体。根据研究结果可确定0Cr13不锈钢二冷区温度应大于910 ℃，最佳轧制温度为950～1050 ℃。
英文摘要：In order to establish proper continuous casting processes and reduce the occurance of edge cracks in continuous casting billets, the physical properties of 0Cr13 ferritic stainless steel continuous casting billet at high temperature were tested by thermal dilatometer and synchronous thermal analyzer. The phase transition behavior between 950 ℃and 1300 ℃ was also investigated. The testing results of thermal dilatometer thermo dilatometric analysis show that the dilatometric curve is nonlinear in the process of temperature elevation from room temperature to 1200 ℃. The DSC analysis indicates there is a obvious crystal transfer between 840 ℃and 890 ℃. The investigation of phase transition at high temperature shows that the microstructure of 0Cr13 stainless steel at 950 ℃ is almost austenite; the amount of austenite reduces when temperature is above 1150 ℃; the microstructure is almost ferrite at 1300 ℃. According to the results, it can be determined that the temperature of second cooling zone should be above 910 ℃, and the best rolling temperature zone is form 950 ℃ to 1050 ℃.