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本文通过改变铸造工艺参数研究了凝固条件对K6合金高温瞬时性能的影响,对不同凝固条件和性能的试棒作了组织分析。研究表明:铸型温度和试棒位置显著影响了合金的冷却凝固速度,从而改变了合金的枝晶臂距及MC、M_3B_2和r—r′共晶的大小、形态与分布;热处理更增大了不同冷速下M_3B_2的大小和形态间的差别;高温瞬时拉伸时这些脆性相的大小、形态与分布显著影响了裂纹的萌生和扩展,因而影响了合金的高温瞬时塑性。
In this paper, the influence of solidification conditions on the transient properties of K6 alloy at high temperature was studied by changing the casting process parameters. The test bars with different solidification conditions and properties were analyzed. The results show that the temperature of the mold and the position of the test bar significantly affect the cooling and solidification rate of the alloy, thus changing the dendrite arm spacing and the size, shape and distribution of the MC, M_3B_2 and r_ r ’eutectic. The heat treatment increases The size and morphology of M_3B_2 at different cooling rates were different. The size, morphology and distribution of these brittle phases significantly affected the initiation and propagation of cracks during high temperature transient stretching, which affected the high temperature transient plasticity of the alloy.