对高温度梯度液态金属冷却(LMC)定向凝固技术中低熔点合金污染、模壳变形破裂等关键问题进行了分析, 通过优化LMC定向凝固工艺, 解决了430 mm长大型铸件变截面位置的断晶、偏晶等问题, 分析了铸件的显微组织、热处理工艺及典型力学性能, 成功研制了大型定向结晶叶片.
Contamination of low melting point metal and distortion and fracture of ceramic shell during directional solidification assisted by liquid metal cooling (LMC) were discussed. Large DS castings with 430 mm in length were produced by optimizing the processing parameters. The microstructure, heat treatment response and typical creep rupture properties of the large casting were analyzed. Results of the preliminary casting trials of large blades were also reported.
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