热轧高钒高速钢轧辊氧化行为研究

Research on oxidation behavior of a high-V high speed steel hot rolls

采用增重法研究了离心铸造高V高速钢热轧辊棍在空气及水蒸气环境中的氧化行为,并采用扫描电子显微镜、X射线衍射等方法研究了氧化膜的结构。结果表明:在等温条件下,当温度低于600℃时,高速钢的氧化速率较慢,而温度达到650℃时,氧化膜快速生长;在氧化过程中,基体优先氧化,不同类型碳化物氧化行为也明显不同;水蒸气环境能够加速氧化膜的生长;温度及环境对氧化膜的相结构也有一定的影响,高温及水蒸气环境促进γ-Fe_3O_2向α-Fe_3O_2转化。

Oxidation behaviors of a high-V high speed steel hot roll manufactured by centrifugal casting in air and vapor environment are investigated by utilizing a oxidation weight increasing method,and then the structure of the oxidation films are studied by means of the scanning electron microscopy（ SEM） and X-ray diffraction（ XRD）. Result shows that the oxidation rate is very slow when the isothermal temperature is below 600 ℃,while the oxidation film quickly grows as the isothermal temperature is at 650 ℃. The matrix of tempering martensite first oxidizes,and the different oxidation behaviors occur in different type carbides. The oxidation is accelerated in vapor environment. The temperature and environment have affect on oxidation film structure,and the temperature and vapor environment promote change form γ-Fe_3O_2 to α-Fe_3O_2.