Ni3Al基合金IC6与变形合金GH3030间真空钎焊接头的安排与力学性能将两种Ni基钎料ВПР24和GHL-6-2用于IC6合金与变形高温合金GH3030之间的真空钎焊,剖析接头钎缝和近缝区母材的微观安排,测试接头的900℃高温耐久寿数,并对断口纵剖面微观安排进行剖析。结果表明:ВПР24对近缝区母材安排没有显着的影响;GHL-6-2中降熔元素B含量较高,导致钎缝两侧近缝区母材析出大量针状硼化物相,严重影响了接头安排及性能,其900℃、22 MPa耐久寿数仅73 h;而运用ВПР24的接头的900℃、22 MPa耐久寿数为361 h,并最终断于母材GH3030,可见,运用ВПР24的接头钎缝处的耐久性能比GH3030基体合金的更好。Microstructure and mechanical properties of vacuum brazed joint between Ni3Al based alloy IC6 and deformed alloy GH3030Mix two types of Ni based brazing materials ВПР 24 and GHL-6-2 are used for vacuum brazing between IC6 alloy and deformed high-temperature alloy GH3030, analyzing the microstructure of the joint brazing seam and the base material near the seam, testing the high-temperature endurance life of the joint at 900 ℃, and analyzing the microstructure of the longitudinal section of the fracture surface. The results indicate that: ВПР 24 pairs have no significant effect on the microstructure of the base material near the seam; The high content of reducing melting element B in GHL-6-2 leads to the precipitation of a large amount of needle shaped boride phases in the base metal near the joint on both sides of the brazing seam, seriously affecting the microstructure and properties of the joint. Its endurance life at 900 ℃ and 22 MPa is only 73 hours; And using ВПР The endurance life of the 24 joint at 900 ℃ and 22 MPa is 361 hours, and it ultimately breaks at the base material GH3030. It can be seen that the use of ВПР The durability performance at the joint of 24 is better than that of GH3030 matrix alloy.GH3030合金高温应变疲惫行为剖析对GH3030合金在600、700和800℃,应变比R=-1时的应变疲惫行为进行研讨。剖析了GH3030合金循环应力-应变响应联系,运用Manson-Coffin模型和含有疲惫极限的应变疲惫公式拟合了其应变-寿数联系曲线,并经过残差剖析对两式的拟合效果做出比较点评。结果表明,合金在800℃时疲惫寿数相对于其他两个温度显着下降。Analysis of High Temperature Strain Fatigue Behavior of GH3030 AlloyStudy the strain fatigue behavior of GH3030 alloy at 600, 700, and 800 ℃ with a strain ratio of R=-1. The stress-strain response relationship of GH3030 alloy was analyzed, and the strain life relationship curve was fitted using the Manson Coffin model and strain fatigue formula containing fatigue limit. The fitting effect of the two equations was compared and evaluated through residual analysis. The results indicate that the fatigue life of the alloy is significantly reduced compared to the other two temperatures at 800 ℃.电磁拌和对GH3030高温合金铸态安排的影响经过试验研讨了电磁拌和对高温合金GH3030铸坯的凝结安排及凝结过程中溶质散布的影响。GH3030合金的凝结微观安排为单相奥氏体,电磁拌和能够打碎枝晶、促进形核,显着细化其晶粒,得到安排细密,晶粒细小的凝结安排。没有电磁拌和的情况下,铸坯的微观偏析和微观偏析都比较严重。经过施加电磁拌和,熔体的流动使得熔体内的传热得到改进,凝结前沿温度梯度变小,同时促进溶质富集区液体与熔体其他部分的混合,然后减轻了Cr元素在铸坯中的微观偏析和微观偏析,使Cr元素散布的愈加均匀,铸坯质量得到提高。The effect of electromagnetic stirring on the as cast microstructure of GH3030 high-temperature alloyThe effect of electromagnetic stirring on the solidification structure and solute distribution during solidification of GH3030 high-temperature alloy billets was studied through experiments. The solidification microstructure of GH3030 alloy is single-phase austenite. Electromagnetic stirring can break down dendrites, promote nucleation, significantly refine its grains, and obtain a dense and fine solidification structure. Without electromagnetic stirring, both macroscopic and microscopic segregation of the casting billet are relatively severe. By applying electromagnetic stirring, the flow of the melt improves heat transfer inside the melt, reduces the temperature gradient at the solidification front, and promotes the mixing of the solute enrichment zone liquid with other parts of the melt, thereby reducing the macroscopic and microscopic segregation of Cr element in the billet, making the distribution of Cr element more uniform, and improving the quality of the billet.
