为提高单晶高温合金的高温力学性能，合金中的难熔元素( 尤其是 Re 和

To improve the high temperature mechanical properties of single crystal superalloys, refractory alloy element <br>contents hormone (especially Re and W) is significantly increased, thereby increasing the solid solution alloy is <br><br>difficult to process. Therefore, under the premise of incipient melting alloy does not occur, a high single-Re <br><br>to develop an optimal degree of difficulty of solution treatment is also growing crystal superalloy <br><br>large. This article summarizes the solution treatment of the second and third generation single crystal superalloy of the <br><br>system, the results show that, by eliminating the low temperature section solute of solid phase transformation during <br><br>the interdendritic precipitates (primary γ 'phase + γ / γ 'eutectic), and the high-temperature stage a solid solution <br><br>by solid-phase diffusion processes to obviate or mitigate the micro-segregation of alloying elements. <br><br>Meanwhile, the phase transition temperature of the solution treatment Superalloy have certain shadow <br><br>ring. Furthermore, conventional solution treatment Superalloy use more stepped heating <br><br>method, in recent years, Hegde, proposed a new method of treatment solution, i.e., using <br><br>a continuous heating method, the advantage of this method is effective in reducing early melting spot <br><br>formed tendency. Zhang also proposes a new method of treatment solution, i.e. remelting <br><br>solution treatment, which method can improve the efficiency of solution temperature and solution, and <br><br>with respect to the conventional solution treatment significantly reduced the microstructure of refractory elements the degree of segregation.

In order to improve the high temperature mechanical properties of single crystal high-temperature alloys, the refractory elements in the alloy<br>significantincrease in the content of the factors (especially Re and W), which in turn increases alloy solidification<br><br>The difficulty of processing. Therefore, without the initial melting of the alloy, the high Re single<br><br>Crystal high temperature alloy to develop an optimal solid-soluble treatment system is becoming more and more difficult<br><br>Big. This paper summarizes the solid-soluble treatment of second- and third-generation single-crystal high-temperature alloys.<br><br>The results show that the solid solution of the low temperature segment is eliminated by the process of solid phase change.<br><br>The inter-branch crystal sepsis (the nassolutation of the 'phase-in/the'co-crystalline tissue) and the high temperature segment solidly dissolves<br><br>Micro-biasing of alloy elements is eliminated or reduced by the process of solid phase diffusion.<br><br>At the same time, the solid-soluble treatment on the phase-change temperature of single-crystal high-temperature alloy also has a certain shadow<br><br>Ring. In addition, the solid-soluble treatment of conventional single-crystal high-temperature alloys is more than step-type heating<br><br>Methods, in recent years, Hegde has proposed a new solid-soluble treatment, i.e. the use of<br><br>Continuous heating method, the advantage of which is that it effectively reduces the primary melting spot<br><br>to form a tendency. Zhang has also proposed a new solution for solid-soluble treatment, namely remelting<br><br>Solid-soluble treatment, the method effectively improves the solid-soluble temperature and the solution efficiency, and<br><br>Compared with the traditional solid-soluble treatment, the degree of micro-biasing of refractory elements is significantly reduced.

In order to improve the high temperature mechanical properties of single crystal superalloy, the refractory element in the alloy<br>The content of element (especially Re and W) increased significantly, which increased the solid solution of the alloy<br>Difficulty of handling. Therefore, under the premise of no primary melting of the alloy, it is a high re single<br>It is more and more difficult to develop an optimal solution treatment system for crystalline Superalloys<br>Big. This paper summarizes the solution treatment of the second and third generation single crystal superalloys<br>The results show that the solid solution in the low temperature phase is eliminated by the solid phase transformation process<br>The dendrite precipitates (primary γ 'phase + γ / γ' eutectic structure) are formed, while the high temperature phase is solid solution<br>The microsegregation of alloy elements is eliminated or reduced by solid diffusion.<br>At the same time, the solution treatment also has some influence on the transformation temperature of single crystal superalloy<br>Ring. In addition, the solution treatment of conventional single crystal superalloys usually adopts step heating<br>Methods. In recent years, Hegde has proposed a new solution treatment method, that is to use<br>The advantage of this method is that it can effectively reduce the<br>Forming tendency. Zhang also proposed a new solution treatment method, namely remelting<br>The method can effectively improve the solution temperature and solution efficiency<br>Compared with the traditional solution treatment, the degree of microsegregation of refractory elements is reduced significantly.