【摘要】 利用扫描电镜和能谱分析研究了产生黑斑的GH3044组织,采用Thermal-Calc分析方法研究了合金凝固过程中液体成分变化,并计算了合金凝固时液体密度的变化,给出了GH3044合金平衡凝固时密度反转的范围。结果表明:合金GH3044黑斑区主要是由Cr,W的碳化物相和少量高W(Cr)的体心立方相组成,合金在凝固过程中约有0.0125g·cm-3·℃-1较大的密度反转。更多还原

【Abstract】 The microstructure of GH3044 with freckles was investigated by SEM and EDAX and the variation of liquid concentration during solidification and equilibrium phase transformation was calculated by the Thermal-Calc analysis.The liquid density and the magnitude of density inversion in GH3044 during solidification were calculated.The results show that a large number of carbides and a small quantity of bcc precipitate containing rich W(or Cr)appear in freckle area.There is a high liquid density inversion of about 0.0125 g·cm-3·℃-1 in GH3044.更多还原