固溶温度对FGH95合金组织和持久性能的影响  

Influence of solution temperature on microstructure and creep properties of FGH95 nickel-base superalloy

作　　者：田素贵[1] 谢君[1] 周晓明[2] 钱本江[1] 伦建伟[1] 于丽丽[1] 汪武祥[2] 

机构地区：[1]沈阳工业大学材料科学与工程学院,辽宁沈阳110178 [2]北京航空材料研究院,北京100095

出　　处：《材料热处理学报》2010年第11期122-127,共6页Transactions of Materials and Heat Treatment

摘　　要：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。By means of the endurance tests and microstructure observation,an investigation was carried out to examine the influence of solution temperature on the microstructure and creep behavior of FGH95 nickel-base superalloy.The results show that,after hot isostatic pressing,the microstructure of the alloy consists of γ matrix and unhomogeneous γ＇ phase in size.When solution treated at 1140 ℃,the regions of poor γ＇ phase and the large amount of thicker γ＇ phase exist still at the particle boundaries,and the amount of the thicker γ＇ phase and the poor γ＇ phase regions decreases with the increase of the solution temperature.After the solution temperature is enhanced to 1160 ℃,the thicker γ＇ phase in the alloy is fully dissolved,and the region of the poor γ＇ phase disappears,and the fine γ＇ phase with high volume fraction is dispersively distributed within the grains,the particles of MC carbide are discontinuously precipitated along the boundaries to improve the boundary strength,which results in the better endurance strength of the alloy under the applied stress of 1034 MPa at 650 ℃.The deformation mechanism of the alloy during creep is as follows：some dislocations are over the γ＇ phase by means of Orowan looping and dislocations shear into the γ＇ phase,therein,the 110 super-dislocation which shears into the γ and γ＇ phases may be decomposed to form the configuration of（1 /6） 112 shockleys dislocation or（1 /3） 112 super-shockleys dislocation plus stacking fault.

关 键 词：FGH95合金 固溶温度 组织形貌 持久性能 

分 类 号：TG166.7[金属学及工艺—热处理]