Investigation of the effect of contaminations and cleaning processes on the surface properties of brazing surfaces

Bobzin, Kirsten; Öte, Mehmet; Wiesner, Stefanie

doi:10.1088/1757-899x/181/1/012027

Cited by 7 publications

(7 citation statements)

References 8 publications

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“…[ 9,10 ] Previous research on of the austenitic stainless steel X5CrNi18‐10 and the high‐chromium brazing paste Ni 650 joints have already demonstrated a substantial effect of adding small amount of refractory metals on the microstructure of brazed joints. [ 11 ] In this study, a mass fraction of ω Ti = 3 wt% Ti was found to have a significant impact on the tensile strength of the joints. This effect was linked to the formation of Ti‐containing precipitates, and their effect on the formation of brittle phases, which precipitate in a more homogeneous distribution.…”

Section: Introductionmentioning

confidence: 76%

Microstructural Modification by Redesigning the Chemical Composition of Ni 620 Filler Metal

2023

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Ni 620 is a widely used brazing alloy, especially in cases where high‐temperature strength and corrosion resistance are required. The formation of undesirable intermetallic phases in the brazing joint due to the addition of boron and silicon as melting point depressants affects the mechanical properties of the joint. Reducing the formation of intermetallic phases during brazing is an important issue in the application of Ni 620. In this study, two approaches, inoculation with Nb and variation of the B and Si content in Ni 620, are pursued to selectively influence the microstructure of the brazed joint. Therefore, the solidus and liquidus temperatures of the new brazing alloys are investigated by means of differential scanning calorimetry measurements. Also, the microstructure of brazed joints is analyzed and evaluated by scanning electron microscope/electron‐dispersive spectroscopy as well as the hardness properties using nanoindentaion. It is observed that the addition of Nb, as well as the variation of the B and Si content, leads to a change in the brittle phase band. Especially brittle borides can be reduced in this way. The results contribute to produce brazing joints with more adapted properties, despite low brazing temperatures and short holding times.

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Section: Introductionmentioning

confidence: 76%

Microstructural Modification by Redesigning the Chemical Composition of Ni 620 Filler Metal

2023

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“…Bobzin et al. explored pre-cleaning and plasma cleaning of stainless steel and Inconel before brazing, and found that these treatments increased surface energy, and hence gave better wetting and improved joints [17].…”

Section: The Brazed Jointmentioning

confidence: 99%

“…While it is widely accepted in brazing that surface cleanliness is paramount in ensuring a high quality joint, there has been little systematic investigation of the effects. Bobzin et al explored pre-cleaning and plasma cleaning of stainless steel and Inconel before brazing, and found that these treatments increased surface energy, and hence gave better wetting and improved joints [17].…”

Section: Cleanliness Of the Jointmentioning

confidence: 99%

Brazing filler metals

Way

Willingham

Goodall

2019

International Materials Reviews

102

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Brazing is a 5000-year-old joining process which still meets advanced joining challenges today. In brazing, components are joined by heating above the melting point of a filler metal placed between them; on solidification a joint is formed. It provides unique advantages over other joining methods, including the ability to join dissimilar material combinations (including metal-ceramic joints), with limited microstructural evolution; producing joints of relatively high strength which are often electrically and thermally conductive. Current interest in brazing is widespread with filler metal development key to enabling a range of future technologies including; fusion energy, Solid Oxide Fuel Cells and nanoelectronics, whilst also assisting the advancement of established fields, such as automotive lightweighting, by tackling the challenges associated with joining aluminium to steels. This review discusses the theory and practice of brazing, with particular reference to filler metals, and covers progress in, and opportunities for, advanced filler metal development.

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“…The aim is to cause branching or breaking of the brittle phase band due to the influence of precipitates containing refractory metals, which act as nucleating components for boron and silicon in the brazing alloy [9]. Microstructural studies on joints of the austenitic stainless steel X5CrNi18-10 and the high-chromium brazing paste Ni 650 shown a significant effect of the addition of small amounts of refractory metals on the microstructure of the brazed joints [10]. A mass fraction of ω Ti = 3 wt % titanium had a significant effect on the tensile strength of the joints.…”

Section: Introductionmentioning

confidence: 99%

Use of molybdenum in Ni 620 filler metal to influence the microstructure of brazed hot work steel

Bobzin,

Heinemann,

Apel

et al. 2024

Materialwissenschaft Werkst

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Brazing of hot work steel with nickel‐based filler metals is a widely used process for manufacturing casting tools. However, the formation of brittle phases in the joint impairs its mechanical properties. Reducing these intermetallic phases is an important aspect. Thermodynamic equilibrium calculations are used to estimate the change in melting range and apearance of intermetallic phases by adding different amounts of molybdenum to Ni 620. The filler metals are then produced and their solidus and liquidus temperatures are investigated using differential scanning calorimetry. Specimens of X37CrMoV5‐1 are then brazed in a vacuum furnace and their microstructure is analysed by scanning electron microscopy/electron dispersive spectroscopy and their hardness properties by nanoindentation. The addition of molybdenum to the Ni 620 filler metal leads to the formation of chromium molybdenum boride rich phases and reduced hardness values in brazed joints. Manipulation of Ni 620 by molybdenum helps to improve relevant properties in brazing hot work steel.

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Investigation of the effect of contaminations and cleaning processes on the surface properties of brazing surfaces

Cited by 7 publications

References 8 publications

Microstructural Modification by Redesigning the Chemical Composition of Ni 620 Filler Metal

Microstructural Modification by Redesigning the Chemical Composition of Ni 620 Filler Metal

Brazing filler metals

Use of molybdenum in Ni 620 filler metal to influence the microstructure of brazed hot work steel

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