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Chen Z.-Q.,China Aviation Industry Shenyang Liming Hangfa Group Company | Tai Q.-A.,China Aviation Industry Shenyang Liming Hangfa Group Company | Zhao X.-D.,China Aviation Industry Shenyang Liming Hangfa Group Company | Wang J.-Y.,China Aviation Industry Shenyang Liming Hangfa Group Company | Li C.-Y.,China Aviation Industry Shenyang Liming Hangfa Group Company
Journal of Iron and Steel Research | Year: 2013

The evolution of carbide, such as MC and M23C6, has significantly effects on the mechanical properties during hot deformation and heat treatment for GH738 superalloy. In order to investigate the carbide precipitation and distribution, the grain boundary carbide and its dissolution were analyzed after 1100-1170 °C ×4h WC treatment, as well as after the pre-heat treatment below the MC carbide dissolution temperature T Mc or up, then aged at the different steps based on the standard hear treatment. Furthermore, the carbide precipitation behavior was demonstrated at 700-1050 °C aging after 1080 °C ×0. 5 h× AC. These experimental results show that the dissolution temperature of MC carbide is about 1150 °C. Before the standard heat treatment, the hot temperature excesses Tmc, the grain boundary carbide appears as a continuous precipitated morphology, and below TMc, as the discontinuous distribution. Also it was obtained the precipitation peak temperature of M23C6 is 900-950 °C. Source

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