Infrared brazing of Ti-6Al-4V and 17-4 PH stainless steel with (Ni)/Cr barrier layer(s)

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:488

Article

Shiue, R. K.¹  Wu, S. K.¹  Shiue, J. Y.¹ 

[1] Natl Taiwan Univ, Dept Mat Sci & Engn, Taipei 106, Taiwan

关键词: Ti-6Al-4V;    17-4PH stainless steel;    infrared brazing;    coating;    shear test;   

DOI  :  10.1016/j.msea.2007.10.075

来源: Elsevier

【 摘 要 】

Ti-6Al-4V and 17-4PH stainless steel (17-4PH SS) with (Ni)/Cr barrier layer(s) were infrared vacuum brazed using two silver-based braze alloys, 72Ag-28Cu and 63Ag-35.25Cu-1.75Ti (wt.%), respectively. Both Cr (15 mu m) and Ni (2 mu m)/Cr (15 mu m) coated 17-4PH SS plates were evaluated in the study. Introducing (Ni)/Cr barrier layer(s) can effectively inhibit the interfacial reaction between the 17-4PH SS and the molten braze during brazing. Therefore, the formation of brittle interfacial Ti-Fe intermetallics next to the 17-4PH SS is avoided and replaced by Ti-Cu-(Ni) and TiCr2 intermetallic compounds in the joint. The average shear strength of the infrared brazed joint with Ni/Cr barrier layers is significantly improved up to 233 MPa. Using (Ni)/Cr barrier layers on the 17-4PH SS has the potential of industrial application in brazing Ti-6Al-4V and 17-4PH SS. (C) 2007 Elsevier B.V. All rights reserved.

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