N5单晶TLP接头中非平衡组织对断裂机理的影响  

Influence of non-equilibrium microstructure on fracture mechanism of TLP bonded N5 single crystal joint

作　　者：柴禄[1,2] 王立[1] 黄继华[1] 侯金保[2] 郎波[2] 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083 [2]北京航空制造工程研究所航空发动机工艺研究室,北京100024

出　　处：《金属热处理》2015年第4期13-18,共6页Heat Treatment of Metals

摘　　要：通过断口观察研究了几种非平衡组织对N5单晶TLP扩散焊接头断裂机理的影响。结果表明,大尺寸化合物是接头在应力状态下的敏感区,增加了接头有效连接面积的平均应力,宏观上则表现为接头力学性能的降低;共晶组织各相弹性模量存在差异,高温持久应力状态下沿相界面易产生脆性断裂;接头中存在第二相粒子时,高温持久断裂和高温拉伸断裂的原始裂纹在第二相粒子处萌生。Effect of non-equilibrium microstructure on fracture mechanism of TLP joints of N5 single crystal superalloy was studied by the method of fracture analysis. The results show that large size compounds come to be the sensitive area and resulted in decreasing mechanical property in the way of increasing the average stress of the effective joint area; different elasticity modulus of phases in the eutectic structures promote the possibility of brittleness breakage from the phase interface under the condition of high temperature endurance rupture; original cracks incline to generate around the second phase particles both during creep rupture and tensile process at elevated temperature.

关 键 词：N5单晶 TLP接头 微观组织 断裂机理 

分 类 号：TG407[金属学及工艺—焊接]