真空加壓釬焊FGH96/DD6接頭的組織和性能

真空加壓釬焊FGH96/DD6接頭的組織和性能Microstructures and Properties of FGH96/DD6 Joints Brazed at Vacuum Pressure State

采用Ni-Cr-B釬料分別在1120℃/10 min和1120℃/10 min/2 MPa的工藝下實現(xiàn)FGH96與DD6的釬焊連接。測試兩種工藝下接頭的抗拉強度，通過光學(xué)顯微鏡（OM）、掃描電子顯微鏡（SEM）和電子探針（EPMA）分析接頭的組織、成分和斷口。結(jié)果表明：真空加壓釬焊所得接頭的室溫平均抗拉強度達到1187 MPa，遠高于真空釬焊接頭621 MPa的強度；與不加壓的真空釬焊相比，真空加壓釬焊所得FGH96/DD6接頭的釬縫中心沒有平行于被焊面的晶界，而是單個晶粒貫穿整個釬縫，并與母材連接面發(fā)生韌性斷裂；真空釬焊接頭中存在Ni3B相，而真空加壓釬焊釬縫中并沒有殘留的Ni3B相，主要由（Ni，Cr）固溶體組成。

Ni-Cr-B brazing filler was used to braze FGH96 and DD6 at 1120℃/10 min and 1120℃/10 min/2 MPa. The tensile strength of the joints was tested, the microstructures and fractures were observed by OM and SEM, and the reaction products were analyzed by EPMA. The results show that the joints brazed at vacuum pressure process offer the average tensile strength of 1187 MPa, outclass the joints brazed without pressure which has average tensile strength of 621 MPa. Compared with vacuum brazing, the grains of FGH96/DD6 joints brazed by vacuum pressure state penetrate the brazing seam without grain boundary and ductile fracture occurred in the parent metal surface. The Ni3B exists in the joints brazed by vacuum brazing, but it is (Ni, Cr) solid solution in the joints brazed by vacuum pressure brazing instead of Ni3B.

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