摘要
采用金相组织观察和氧化增重法等手段研究了加热温度对55SiCr钢脱碳和氧化的影响。试验结果表明,随着加热温度的升高,55SiCr试样表面首先出现轻微全脱碳;然后全脱碳程度加重,铁素体厚度增大;最后全脱碳程度降低而部分脱碳加深,出现网状渗碳体。55SiCr钢的氧化增重率曲线的斜率随加热温度的升高而增大,氧化速度大幅提高。为了避免发生脱碳现象,应尽量缩短材料在800℃左右的停留时间。加热工艺改进后,55SiCr弹簧钢盘条的脱碳情况得到了较好的控制。
The effect of heating temperature on decarburization and oxidation of 55SiCr steel was studied using metallographic observation and oxidation weight gain method.The results showed that with the heating temperature increased,the surface of 55SiCr specimen first appeared slight full decarbonisation,then the degree of full decarbonisation increased and the thickness of ferrite increased,finally the degree of decarburization reduced while partialde carburization deepened,resulting in the network cementite.The slope of the oxidation weight gain rate curve of 55SiCr increased with the increase of heating temperature,and the oxidation rate increased greatly.The residence time of the material at around 800℃should be shortened in order to avoid decarburization.The decarburization of 55SiCr spring steel wire rod has been well controlled after the improvement of heating process.
作者
陈华
CHEN Hua(School of Mechanical and Electrical Engineering,Liuzhou Polytechnic University,Liuzhou 545006,Guangxi,China)
出处
《热处理技术与装备》
2025年第2期52-56,共5页
Heat Treatment Technology and Equipment
关键词
55SiCr钢
脱碳氧化
金相组织
55SiCr steel
decarbonization and oxidation
metallographic structure
