不同氧含量的Fe-36Ni因瓦合金的晶间内氧化行为

Effect of total oxygen content on intergranular oxidation behavior of Fe-36Ni invar alloy at high temperature

利用恒温氧化试验,研究了不同总氧含量的Fe-36Ni因瓦合金在1000℃和1100℃下的高温氧化行为,通过SEM分析了两种试样在不同温度下氧化层的截面形貌的差异并比较了两者氧化增重曲线的不同。试验结果表明,氧化温度和钢内总氧含量能显著影响Fe-36Ni因瓦合金的晶间内氧化行为;氧化温度越高,反应物质扩散越快,晶间内氧化层厚度越大,氧化越严重;钢内总氧含量较高时,有利于反应物质沿晶界扩散,从而造成更严重的晶间内氧化现象。

High-temperature oxidation behaviors of Fe-36 Ni invar alloys with different oxygen content at 1000 ℃ and 1100 ℃ were investigated by isothermal oxidation.The difference of oxide layer section morphology was studied with SEM,further more the oxidation mass gain curve was also analyzed.Following results were obtained：The oxidation temperature and total oxygen content play an important role in high temperature oxidation of the invar alloy;The diffusion rate of reaction substance becomes faster with the increase of oxidation temperature,which results in more serious intergranular oxidation.It is easier for reactive substances to diffuse along the grain boundary in the Fe-36 Ni invar alloy with higher oxygen content,which could cause more serious intergranular oxidation.