摘要
采用VL2000DX-SVF18SP型超高温激光共聚焦显微镜原位观察了高V高速钢的氧化行为,并与采用NETZSCHSTA449C型示差扫描量热仪/热重(DSC/TGA)连续加热过程氧化增重进行了对比。结果表明:高V高速钢的组织由分布在马氏体基体上的含V的MC型球形碳化物及Cr、Mo为主的M7C3和M6C型共晶碳化物构成。高速钢在连续加热过程中,当温度低于480℃时,随温度增加,几乎不氧化;当温度高于480℃时,氧化速度随温度升高显著增加;当温度高于650℃时,氧化速度随温度增加呈线性增加。不同相氧化速度不同,氧化主要发生在基体上,且含V的MC型碳化物周围氧化较快;而共晶区M7C3型碳化物氧化最缓慢。
The oxidation behavior of a high-V high speed steel was observed in-situ by VL2000 DX-SVF18 SP ultra-high temperature laser confocal microscopy,and compared with the result of oxidation weight gain which was measured by a NETZSCHSTA449 C differential scanning calorimeter/thermal gravimetric analyzer(DSC/TGA)during continuous heating process.The results showed that the microstructure of the high-V high speed steel consisted of spherical MC carbide particles distributed on martensite matrix and eutectic carbides of M7 C3 and M6 C.In the process of continuous heating,when the heating temperature was lower than 480℃,the high speed steel almost did not oxidize with the increase of temperature,but when the heating temperature was higher than 480℃,the oxidation rate increased significantly with the increase of the increase of the heating temperature.When the heating temperature was over 650℃,the oxidation rate increased linearly with the increase of the heating temperature.The oxidation rate of different phases is different.The fast oxidation occurs around V-carbides,and the slower oxidation occurs in eutectic region.
作者
苏长水
王晓东
周旬
肖福仁
SU Chang-shui;WANG Xiao-dong;ZHOU Xun;XIAO Fu-ren(Hot Rolling Division,Shougang Jingtang Iron and Steel Co.,Ltd.,Caofeidian063200,China;State Key Laboratory of Metastable Materials Science and Technology,College of Materials Science and Engineering,Yanshan University,Qinhuangdao066004,China)
出处
《物理测试》
CAS
2019年第4期1-5,共5页
Physics Examination and Testing
基金
首钢蓝精灵计划资助项目(2015首京唐科-07)
关键词
轧辊
高速钢
氧化
原位观察
roll
high speed steel
oxidation
in-situ observation
