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| Home > Publications database > Diffusion bonding of steels with a homogeneous microstructure throughout the joint |
| Journal Article | IMPULSE-2024-00194 |
; ; ; ; ;
2024
Springer Science + Business Media B.V
Dordrecht [u.a.]
Please use a persistent id in citations: doi:10.1007/s10853-024-10343-x
Abstract: Cold-finished carbon steel bars were bonded by means of the transient liquidphase bonding (TLPB) process using amorphous metallic foils of the eutectic Fe-Bcomposition as filler material. A homogeneous microstructure throughout thejoint was obtained. Traces of borides in the middle of the joint were the only distinguishablemicroconstituent from the base metal due to the TLPB process. The Bconcentration profile across the joint was measured by neutron radiography andwas found to be composed of a central sharp peak with a maximum concentrationof 15.9 ppm B superimposed over a broad peak (base width of ≈ 5 mm) with amaximum concentration of 13.3 ppm B. Owing to this low range of B concentrations,boride precipitation was almost suppressed, and only a scarce number ofborides were observed at the joint. The resulting boride structure was identifiedas Fe23B6by synchrotron microfocused X-ray diffraction, and its stabilization atroom temperature is discussed. The bonded samples were subjected to a bendtest, with a bending angle of 180°, and no cracks were observed. In tension tests,the bonded samples attained an ultimate tensile strength (UTS) of 434 MPa, anelongation of 32.3% and a reduction area q of 51.2%—78.6%, 165.6% and 75.4%,respectively, of the base metal. The fracture of the bonded samples occurred at thejoint. It was determined that the decrease in UTS compared with that of the basemetal was due to the recovery, recrystallization and grain growth that occurredduring the TLPB thermal cycle. In addition, from fracture surface observation, itwas found that the decrease in q in bonded samples was caused by the presenceof traces of borides at the joint, which were the result of the liquid phase thatsolidified during the cooling stage.
Keyword(s): Engineering, Industrial Materials and Processing (1st) ; Materials Science (2nd)
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