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液态金属(锡)冷却法(LMC)定向凝固高温合金对合金铸件有少量锡的污染,为验证,不同锡含量对定向凝固高温合金组织和主要性能的影响,本研究选择在DZ17合金中分别加入<0.001、0.007、0.019、0.038、0.073％Sn。发现,定向凝固合金含有少量的锡(0.073％重量)对合金机械性能相对地来说无有害作用;随着锡含量的增加,中温和高温持久寿命相应降低,但比普通铸造合金持久寿命的降低幅度大为减少;对室温和高温拉伸性能无影响;合金中存在微量锡时,枝晶干、枝晶间、MC、γ+γ’共晶中锡的含量分布均匀,当锡含量增多时,锡在γ+γ’共晶边沿的分布明显增加。
In order to verify the effect of different tin content on the microstructure and main properties of the directional solidification superalloy, a small amount of tin contamination of alloy castings by liquid metal (tin) cooling (LMC) directional solidification superalloy was chosen. In this study, DZ17 alloy <0.001, 0.007, 0.019, 0.038, 0.073% Sn. It was found that the low content of tin (0.073 wt%) in the directional solidification alloy has no harmful effect on the mechanical properties of the alloy. With the increase of tin content, the long-life at medium temperature and high temperature decreases correspondingly, but decreases more than the ordinary alloy When the content of tin increases, the content of tin in MC and γ + γ ’eutectic is distributed evenly between the dry and dendritic grains. , The distribution of tin on the γ + γ ’eutectic edge obviously increases.