论文部分内容阅读
采用金相显微镜、扫描电镜(SEM)、X射线能谱(EDS)、X射线衍射(XRD)、透射电镜(TEM)及布氏硬度实验研究了热处理制度对GH4199合金组织和硬度的影响。结果表明:在1080~1180℃进行固溶处理,合金硬度随着加热时间的延长逐渐下降,固溶温度越低,达到稳定硬度值所需的时间越长,且稳定硬度值也就越高;随着固溶温度的增加奥氏体晶粒逐渐长大,超过1120℃后晶粒明显粗化;在1120℃以下,固溶处理时间对晶粒大小几乎没有影响;合金组织中含有大量的碳化物,主要以M6C形式存在,也有少量的M23C6和MC。随着固溶温度的增加和时间的延长,在晶界呈链状不均匀分布的碳化物逐渐溶解、粗化。
The effects of heat treatment on microstructure and hardness of GH4199 alloy were investigated by means of metallographic microscope, scanning electron microscopy (SEM), X-ray energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), transmission electron microscopy (TEM) and Brinell hardness test. The results show that when the solution temperature is between 1080 and 1180 ℃, the hardness of alloy decreases with the increase of heating time. The lower the solution temperature is, the longer it takes to reach steady hardness value and the higher the stable hardness value. With the increase of solution temperature, the austenite grains grow up gradually, and the grain coarsens more than 1120 ℃. When the temperature is below 1120 ℃, the solution treatment time has almost no effect on the grain size. The alloy structure contains a large amount of carbonization Material, mainly in the form of M6C, there are also a small amount of M23C6 and MC. With the increase of solution temperature and the extension of time, the carbides distributed unevenly in the grain boundaries gradually dissolve and coarsen.