低碳马氏体不锈钢热处理过程中夹杂物转变动力学  

Kinetics on transformation of inclusions in low carbon martensitic stainless steel during heat treatment process

作　　者：黄日清 任英[3] 张立峰 程礼梅 张健 HUANG Riqing;REN Ying;ZHANG Lifeng;CHENG Limei;ZHANG Jian(Key Laboratory for Iron and Steel Metallurgy and Resources Utilization of Ministry of Education,Wuhan University of Science and Technology,Wuhan 430081,Hubei,China;School of Intelligent Metallurgical,Guangxi Modern Polytechnic College,Hechi 547000,Guangxi,China;School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083,China;School of Mechanical and Materials Engineering,North China University of Technology,Beijing 100144,China;Special Steel Technology Research Institute,Pangang Group Research Insititue Co.,Ltd.,Panzhihua 610031,Sichuan,China)

机构地区：[1]武汉科技大学钢铁冶金及资源利用省部共建教育部重点实验室,湖北武汉430081 [2]广西现代职业技术学院智能冶金学院,广西河池547000 [3]北京科技大学冶金与生态工程学院,北京100083 [4]北方工业大学机械与材料工程学院,北京100144 [5]攀钢集团研究院有限公司特钢技术研究所,四川攀枝花610031

出　　处：《中国冶金》2024年第11期44-52,共9页China Metallurgy

基　　金：国家重点研发计划项目(2023YFB3709900);国家自然科学基金资助项目(U22A20171);中国宝武低碳冶金创新基金资助项目(BWLCF202315);攀钢-北科大钒钛研究院科研资助项目。

摘　　要：夹杂物对低碳马氏体不锈钢的力学性能和腐蚀性能有重要影响,已有研究主要针对低碳马氏体不锈钢钢液中夹杂物的控制,对热处理过程中夹杂物转变的相关研究较少。通过实验室热处理试验和动力学计算,揭示了低碳马氏体不锈钢加热过程中夹杂物的转变规律。结果表明,热处理前低碳马氏体不锈钢中夹杂物的主要成分为24%Al_(2)O_(3)-9%MgO-41%CaO-26%SiO_(2);热处理后,夹杂物中的Al_(2)O_(3)含量增加,CaO含量和SiO_(2)含量降低,MgO含量波动变化。随着热处理温度从900℃增加至1200℃,钢中夹杂物的尺寸、面积分数和数密度因夹杂物与钢基体之间的化学反应而产生波动。随着加热温度升高,基体中相关元素在低碳马氏体不锈钢中的扩散系数增加,有利于钢基体与夹杂物发生化学反应,导致夹杂物成分发生的转变概率增加。建立了低碳马氏体不锈钢加热过程中夹杂物转变的动力学模型,模型考虑了元素的扩散和边界层的化学反应,计算了热处理过程中夹杂物成分随时间的变化规律,可以用于预测热处理过程中不同参数对夹杂物成分的影响。Inclusions have a significant impact on the mechanical properties and corrosion resistance of low-carbon martensitic stainless steel.Existing investigations mainly focuses on the control of inclusions in the molten steel of low-carbon martensitic stainless steel,while there is little studies on the transformation of inclusions during the heat treatment process.Through laboratory heat treatment experiments and kinetic calculation,the transformation law of inclusions in the heating process of low carbon martensitic stainless steel was revealed.It is shown that the main composition of inclusions before the heat treatment is 24%Al_(2)O_(3)-9%MgO-41%CaO-26%SiO_(2).After heat treatment,the content of Al_(2)O_(3) increases,content of CaO and SiO_(2) decrease,and the content of MgO fluctuats.With the increase of temperature from 900℃to 1200℃,the size,area fraction and number density of the inclusions in steel are fluctuated due to the chemical reaction between the inclusions and the steel matrix.With the increase of heating temperature,the diffusion coefficient of elements in the low carbon martensitic stainless steel increase,which is conducive to the chemical reaction between steel matrix and inclusions,resulting in the increase of the transformation rate of inclusions.A kinetic model of inclusion evolution during the heating of low carbon martensitic stainless steel is established,considering the diffusion of elements and the chemical reactions at the boundary layer.The model is used to calculate the variation of the composition of inclusions over time during the heat treatment process,which can be used to predict effects of various parameters on inclusion composition during the heat treatment process.

关 键 词：低碳马氏体不锈钢 热处理 夹杂物 动力学计算 热力学 

分 类 号：TG161[金属学及工艺—热处理]