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通过对不同工艺处理FGH95合金进行组织形貌观察及持久性能测试,研究了固溶温度对合金组织与持久性能的影响。结果表明:经热等静压后,合金的组织结构由不同尺寸的γ′相和γ基体所组成;经1140℃较低温度固溶及时效处理后,在颗粒边界区域仍存在较多粗大γ′相和γ′相贫化区,随固溶温度提高,粗大γ′相及γ′相贫化区数量减少。当固溶温度提高到1160℃,合金中粗大γ′相完全溶解,γ′相贫化区消失,且高体积分数细小γ′相在晶内弥散分布,并有粒状MC型碳化合物在晶内及沿晶界不连续析出,可改善晶界的结合强度,使合金在650℃、1034MPa条件下具有较高的持久强度。在蠕变期间合金的变形机制是位错以Orowan机制饶过γ′相和位错切割γ′相,其中,<110>位错切入γ或γ′相时,可分解形成(1/6)<112>肖克莱不全位错或(1/3)<112>超肖克莱不全位错+层错的位错组态。
The effects of solution temperature on the microstructure and ductility of FGH95 alloy were investigated by observing the microstructure and durability of the alloy. The results show that the structure of the alloy is composed of γ ’phase and γ matrix with different sizes after hot isostatic pressing. After solid solution and aging treatment at 1140 ℃, there are still more coarse γ in the grain boundary region With the increase of solution temperature, the number of coarse γ ’phase and γ’ phase depletion zone decreases. When the solution temperature is increased to 1160 ℃, the coarse γ ’phase is completely dissolved and the γ’ phase depletion zone disappears, and the high volume fraction of fine γ ’phase is dispersed in the crystal and the granular MC type carbon compound is in the crystal And discontinuous precipitation along the grain boundaries can improve the grain boundary bonding strength, so that the alloy at 650 ℃, 1034MPa conditions have a higher long-lasting strength. The deformation mechanism of the alloy during creep is that the dislocations are spun γ ’phase and dislocation γ’ phase by the Orowan mechanism, in which the dislocation of the <110> dislocation forms (1/6) <112> Shockley incomplete dislocation or (1/3) <112> Chaos Klein incomplete dislocation + stacking fault dislocation configuration.