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随着固溶温度的提高,显微组织发生明显的变化,共晶Υ′相和初生的粗大Υ′相不断回溶,重新析出更多更细的Υ′相。与此同时,晶界状态也逐渐变成“细线”状。元素的枝晶偏析减小,中、高温的纵向持久寿命增加。但是,中温横向持久寿命显著降低。在试验中测定了DZ22合金的初熔温度为1230～1240°C,并进行了提高初熔温度的试验。文中讨论了确定定向凝固合金回溶温度的原则,根据试验结果,认为DZ22台金选用1200～1210°C为宜。
With the increase of solution temperature, the microstructure changes evidently. The eutectic Y ’phase and the primary Y’ phase are continuously dissolved back to more and more fine Y ’phase. At the same time, the grain boundary state gradually become “thin line” shape. Dendritic element segregation decreases, medium and high temperature vertical life expectancy increased. However, the long-term life expectancy at transverse temperatures is significantly reduced. In the test, the initial melting temperature of DZ22 alloy was determined to be 1230 ~ 1240 ° C, and the experiment of increasing the initial melting temperature was carried out. The paper discusses the principle of determining the solution temperature of directional solidification alloy, according to the test results, that DZ22 Taiwan gold selection 1200 ~ 1210 ° C is appropriate.