摘要
利用同步热分析仪研究了2%(体积分数)残氧气氛下硅对弹簧钢氧化速率的影响。实验表明,硅元素在1 170℃以下对氧化有阻碍作用,而1 200℃时有明显的促进作用。在1 170℃及以下,60Si2Mn弹簧钢氧化层和金属基体之间有一个硅酸亚铁层,阻碍了铁离子向外扩散,导致了氧化减慢。而1 200℃时该层呈液态,并渗入氧化铁皮中,促进铁离子向外扩散和氧离子向基体扩散,加重了氧化。
Effect of Si on the growth rates of the oxide scales of spring steels were investigated by using a simulta- neous thermal analyzer in atmosphere with 02 of 2% and Ar of 98%. The results show that Si retards the oxidation reaction below 1170 ℃, while strongly accelerates the oxidation at 1200℃. Below 1 170℃, fayalite, Fe2 SiO4 is found between the scale and metal of 60Si2Mn, acting as a diffusion barrier of divalent Fe ions, leading to decreasing the growth rate of oxide scale. However, at 1200℃, the oxidation is strongly accelerated due to the presence of liquid fayalite permeating into the oxide scale, which promotes iron ions migrating outward and oxygen ions diffusing inwards.
出处
《钢铁研究学报》
CAS
CSCD
北大核心
2015年第5期55-60,共6页
Journal of Iron and Steel Research
关键词
弹簧钢
氧化速率
硅
低氧浓度
spring steel
oxidation rate
silicon
low oxygen concentration
