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M_6C形式存在,也有少量的M_(23)C_6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.
lnfluence of heat treatment on microstructure and hardness of CH4199 alloy was studied by means of optical microscopy(OM) ,scanning electron microscopy (SEM) ,energy dispersive spectroscopy (EDS) ,X-ray diffraction (XRD) ,transmission electron microscopy (TEM) and Brinell hardness test. The results indicate that the hardness of GH4199 alloy decreases gradually to a stable value with the increasing of heat treatment time (at 1080-1180 ℃) ,and the lower stable hardness value and shorter holding time is observed for GH4199 alloy solution treated at higher temperature8. The austenite grains grow gradually with the increase of solid solution temperature and is coarsened markedly when the solid solution temperature exceeds 1120℃ . No significant effect of solid solution time on austenite grain is detected when solution temperature is lower than 1120℃ . The carbides in GH4199 alloy are found moatly in the form of M_6C and a little amount of M_(23)C_6 and MC. The carbides unhomogeneously distributed at grain boundaries are dissolved and coarsened gradually with the increase of solid solution temperature and holding time.
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