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首页> 中文期刊> 《中国有色金属学报（英文版）》 >间隙尺寸和循环热冲击处理对瞬时液相扩散连接IN-738LC高温合金力学性能的影响

间隙尺寸和循环热冲击处理对瞬时液相扩散连接IN-738LC高温合金力学性能的影响

         
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摘要

Influences of gap size and cyclic-thermal-shock treatment on the mechanical properties of transient liquid phase (TLP) bonded IN-738LC superalloy were investigated. For this purpose, TLP bonding of IN-738LC superalloy was carried out in a vacuum furnace using powdered AMS 4777 as the filler metal. The results showed that isothermal solidified zone (ISZ) consisted of Ni solid-solution and the distribution of alloying elements was homogeneous. High hardness of HV 409 and high shear strength of 506 MPa were observed in 40 μm gap sample. Alloying elements formed γ′ precipitates and the solid-solution in the ISZ. Hardness and shear strength of bonds were reduced with increasing the gap size (in range of 40?120 μm). The fractured surfaces of complete isothermal solidified bonds showed dimpled rupture, but athermal solidified bonds showed cleavage fracture surface. 10, 20, 30 and 40 thermal-shock cycles were applied to 80 μm gap samples, respectively. The shear strength of the bond was measured to be 268 MPa after the 40th thermal-shock cycle. The sample with gap size of 80 μm was failed due to crack nucleation on faying surface at 45th thermal-shock cycle. The amount of the produced brittleness due to quenching the samples in water bath was attributed to the number of thermal-shock cycles.%研究间隙尺寸和循环热冲击处理对瞬时液相扩散连接 IN-738LC 高温合金力学性能的影响.用粉末状AMS 4777作为焊料在真空炉中对IN-738LC高温合金进行瞬时液相扩散连接试验.结果表明,等温凝固区由Ni固溶体组成,且合金化元素分布均匀.间隙尺寸为40 μm的样品具有HV409的高硬度和506 MPa的高强度.在等温凝固区,合金化元素形成γ′析出相及Ni固溶体.合金连接处的硬度和强度随间隙尺寸(40~120 μm)的增大而降低.完全等温凝固连接处的断裂表面呈韧窝断裂;非热凝固连接处呈解理断裂.对间隙尺寸为80 μm的样品分别进行10、20、30和40次循环热冲击试验.经过40次循环热冲击后,合金连接处的剪切强度为268 MPa.当循环热冲击次数为45时,由于接合面上的裂纹形核,间隙尺寸为80 μm的合金样品发生断裂.由于受到循环热冲击,在水浴中对合金样品进行水淬后样品脆性增强.

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