温度和气氛对含Ni钢热处理过程氧化动力学和氧化膜特征的影响  

Effect of temperature and atmosphere on oxidation kinetics and oxide scale characteristics of Ni-containing steel during heat treatment

作　　者：杨治争 张蓬朝[2] 霍旭东 李光强 汪勇[4] 刘昱 YANG Zhizheng;ZHANG Pengzhao;HUO Xudong;LI Guangqiang;WANG Yong;LIU Yu(Wuhan Branch of Baosteel Central Research Institute(R&D Center ofWuhan Iron Steel Co.,Ltd.),Wuhan 430080,China;Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education,Wuhan University of Science and Technology,Wuhan 430081,China;Hubei Provincial Key Laboratory for New Processes of Ironmaking and Steelmaking,Wuhan University of Science and Technology,Wuhan 430081,China;School of Intelligent Manufacturing and Mechanical Engineering,Hunan Institute of Technology,Hengyang 421002,China)

机构地区：[1]宝钢股份中央研究院武汉分院(武钢有限技术中心),湖北武汉430080 [2]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 [3]武汉科技大学钢铁冶金新工艺湖北省重点实验室,湖北武汉430081 [4]湖南工学院智能制造与机械工程学院,湖南衡阳421002

出　　处：《武汉科技大学学报》2025年第1期1-7,共7页Journal of Wuhan University of Science and Technology

基　　金：国家自然科学基金项目(52374309,52004189);湖北省自然科学基金项目(2022CFB051);中国博士后科学基金项目(2023T160210,2022M721109);中国科协青年人才托举工程项目(2022QNRC001).

摘　　要：本文针对给定成分的(0.04%~0.07%)C-(7%~8%)Ni钢,系统探究了热处理温度与气氛对其氧化动力学和氧化膜特征的影响。结果表明,在800~950℃温度范围内,降低气相氧分压可显著抑制该含Ni钢的氧化增重,并使氧化动力学曲线由线性向抛物线转变,表明氧化反应速率的控制步骤由化学反应速率向扩散传质速率转变。由于内氧化层中富Ni金属相与Fe氧化物相互镶嵌形成网状结构,钢材的除鳞性能受到抑制。随着氧化温度的升高,不同气氛下钢样表面外氧化膜厚度均呈增加趋势,但内氧化层的演变则存在差异:在空气中,内氧化膜厚度随氧化温度升高而持续增加;而在高纯氮气气氛中,内氧化膜厚度则随温度升高先增大后减小,在950℃几乎消失。其原因在于高温下致密外氧化膜的形成和长大会降低气体/膜界面的氧浓度梯度,从而抑制了内氧化的发生。This study systematically investigated the effect of heat treatment temperature and atmosphere on the oxidation kinetics and oxide scale characteristics of a(0.04%~0.07%)C-(7%~8%)Ni steel.The results show that within the temperature range of 800~950℃,reducing the partial pressure of oxygen in the gas phase significantly suppresses oxidation weight gain.Concurrently,the oxidation kinetics curve shifts from linear to parabolic,indicating that the rate-controlling step changes from chemical reaction to diffusion-controlled mass transfer.Due to the formation of a network-like structure in the inner oxidation layer,where Ni-rich metallic phases and Fe oxides interlock with each other,the descalability of oxide scale on the steel surface is impaired.As the oxidation temperature increases,the thickness of the external oxide scale increases under all atmospheres tested.However,the evolution of the inner oxide layer varies:in air,its thickness consistently increases with temperature,whereas in nitrogen atmosphere,it first increases and then decreases,becoming almost negligible at 950℃.This phenomenon can be attributed to the growth of the external oxide scale at high temperatures,which reduces the oxygen concentration gradient at the gas/oxide scale interface and thus inhibits inner oxidation.

关 键 词：含Ni钢 热处理 氧化动力学 氧化膜 气相氧分压 

分 类 号：TF142.3[冶金工程—冶金物理化学] TG172.82[金属学及工艺—金属表面处理]