摘要
针对超高锰钢Fe-24Mn-4Cr-0.6C的高温氧化,采用热重法测定了超高锰钢在1100~1250℃的氧化增量曲线,拟合计算了超高锰钢的氧化速率曲线及氧化激活能;并借助XRD和SEM-EDS等手段分析了不同氧化温度的氧化层物相、形貌及元素分布,阐述了超高锰钢的氧化机制。结果表明,超高锰钢Fe-24Mn-4Cr-0.6C在1100~1250℃下的恒温氧化基本遵循抛物线规律,氧化初期氧化速率较快,以界面反应为主导;氧化中后期主要受氧和金属元素扩散控制,氧化速率逐渐降低直至平稳。经拟合得到超高锰钢Fe-24Mn-4Cr-0.6C氧化激活能为42.26 kJ/mol。随着氧化温度的升高,超高锰钢氧化层上表层逐渐致密化;而且内氧化程度不断加剧,靠近基体内侧呈现较为明显的晶界氧化;1250℃氧化时,SiO_(2)与铁、锰的氧化物结合形成的液态Fe_(2)SiO_(4)或(Mn,Fe)_(2)SiO_(4)沿着晶界的渗透进一步加剧了晶界氧化。
Aiming at the high temperature oxidation of ultra-high manganese steel Fe-24Mn-4Cr-0.6C,the oxidation mass gain curves of the ultra-high manganese steel at 1100-1250℃were measured by thermogravimetric method,and the oxidation rate curves and oxidation activation energy of the tested steel were fitted and calculated.The phase,morphology and element distribution of the oxide layer at different oxidation temperatures were analyzed by means of XRD and SEM-EDS,and the oxidation mechanism of the tested steel was described.The results show that the isothermal oxidation of the ultra-high manganese steel Fe-24Mn-4Cr-0.6C at 1100-1250℃basically follows the parabolic law,and the oxidation rate is faster at the initial stage of oxidation,which is dominated by interfacial reaction.In the middle and late stages of oxidation,it is mainly controlled by oxygen and metal element diffusion,and the oxidation rate gradually decreases until being stable.The oxidation activation energy of the ultra-high manganese steel Fe-24Mn-4Cr-0.6C is 42.26 kJ/mol.With the increase of oxidation temperature,the upper surface of the oxide layer of the tested steel is gradually densified.Moreover,the degree of internal oxidation is increasing,and there is obvious grain boundary oxidation near the inner side of the matrix.When oxidized at 1250℃,SiO_(2) combines with iron and manganese oxides to form liquid Fe_(2)SiO_(4) or(Mn,Fe)_(2)SiO_(4),of which the penetration along the grain boundary further aggravates the grain boundary oxidation.
作者
杨富云
桑绍柏
杨启宝
李亚伟
王恒
朱天彬
Yang Fuyun;Sang Shaobai;Yang Qibao;Li Yawei;Wang Heng;Zhu Tianbin(State Key Laboratory of Advanced Refractories(Wuhan),Wuhan University of Science and Technology,Wuhan Hubei 430081,China;National-Provincial Joint Engineering Research Center of High Temperature Materials and Lining Technology,Wuhan Hubei 430081,China)
出处
《金属热处理》
北大核心
2025年第8期24-29,共6页
Heat Treatment of Metals
关键词
超高锰钢
高温氧化
氧化动力学
晶界氧化
ultra-high manganese steel
high temperature oxidation
oxidation kinetics
grain boundary oxidation
