摘要
为提高焦罐内衬板的使用寿命,研制了一种成本较低的高硅中铬耐热钢——Cr13Si5铁素体耐热钢,借助光学金相显微镜、扫描电子显微镜、能谱仪和X射线衍射仪等手段,从化学成分、铸态组织、氧化膜的形貌、构成和分布等方面对其1100℃下的高温抗氧化规律进行了分析和研究。结果表明,1100℃下,抗氧化性较好的为Cr13Si5铁素体耐热钢,原因是其氧化膜构成为SiO2和尖晶石结构氧化物MnCr2O4.紧邻基体的SiO2膜,明显降低了基体的氧化速率。粗大的碳化物破坏氧化膜的完整性,使得氧化膜容易脱落,阻碍了前期氧化膜的形成;而分布在奥氏体-铁素体界面上的细小碳化物对高温氧化前期氧化膜的形成影响不大。
In order to prolong the life of the inner liner of coke can,a low cost material,Cr13Si5 heat-resisting steel was designed.By OM,SEM,EDS and XRD,its anti-oxidation law was analyzed on chemical constituent and as-cast structure and the morphology,composition and location of the oxide films at 1 000 ℃.The results show that the oxidation resistance of Cr13Si5 ferritic heat-resistant steel is good at 1 000℃ because of SiO2 layer and MnCr2O4 layer.SiO2 layer is on the matrix which lowers the oxidation rate considerably.The big size carbides break the completeness of the oxide film,cause the spallation and reject the formation of the early oxide film.But the small size carbides between the austenite and ferrite have little influence.
出处
《铸造技术》
CAS
北大核心
2011年第2期179-183,共5页
Foundry Technology
