摘要
通过对低铬（409L）和中铬（439）含钛铁素体不锈钢在900℃下空气中开展恒温氧化试验,获得了两种钢的氧化动力学曲线,并结合EPMA、SEM和XRD等方法对氧化皮的结构进行了分析。结果表明,409L和439氧化动力学曲线均遵从抛物线规律,但409L抛物线速度常数远高于439;409L氧化80h后氧化层结构由外侧Fe_2O_3和内侧（Fe,Cr,Mn）_3O_4复合尖晶石组成;439氧化80h后氧化层外侧则由Cr_2O_3和（Cr,Mn）_3O_4尖晶石组成,内侧为一层SiO_2,基体内还伴有钛的内氧化;较高的铬含量能保证TiO_2内氧化颗粒稳定存在,而TiO_2内氧化颗粒阻止离子迁移,显著降低氧化速度。
The isothermal oxidation tests of the low chromium（409 L）and medium chromium（439）titanium stainless steel were carried out at 900℃.The oxidation kinetic curves of the two steels were obtained and the structure of oxide scale was analyzed by EPMA,SEM and XRD.The results indicated that the curves of the 409 Land 439 stainless steel both followed the parabolic curve.But the parabolic velocity constant for 409 Lstainless steel was much higher than that for 439 stainless steel.The oxide layer of 409 Lstainless steel was formed by（Fe,Cr,Mn）_3O_4 and Fe_2O_3 after oxidation of 80 h.The outside layer of the oxide layer of 439 stainless steel was formed by Cr_2O_3 and（Cr,Mn）_3O_4,the inner layer of the oxide layer was SiO_2 and the internal oxidation of Ti was accompanied in the matrix.The higher content of Cr can ensure the stable existence of the oxide particles in the TiO_2,and the TiO_2 oxidation particles can prevent the ion migration and reduce the oxidation rate significantly.
出处
《中国冶金》
CAS
北大核心
2018年第1期27-31,共5页
China Metallurgy
关键词
含钛铁素体不锈钢
氧化动力学
氧化机理
内氧化物
ferritic stainless steel containing titanium
oxidation kinetics
oxidation mechanism
inner oxide
