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Synchrotron X-ray study of vacuum brazed 316L stainless steel joints

Lenrick, F. LU orcid ; Lazar, I. ; Rajashekar, P. LU ; Yondu, I. LU ; Bhattacharya, R. LU ; Slama, Martin ; Knutsson, Axel and Mikkelsen, A. LU (2025) The 14th International Conference on Brazing, High Temperature Brazing and Diffusion Bonding In DVS Berichte 399. p.114-119
Abstract
Nickel phosphide is a valuable material in high-temperature brazing and joining applications, offering excellent thermal stability for temperatures up to 400°C. Nickel phosphide is used as powder form for joining applications and therefore it is imperative to study the formation as well as interaction of Ni2P particles with Brazing with nickel-chromium-based fillers is widely used to join stainless steel components in applications such as heat exchangers, where strong, corrosion-resistant joints are essential. Silicon and boron additives lower the filler melting temperature but can promote the formation of chromium-rich precipitates near the joint. This study characterizes such precipitates in AISI 316 stainless steel brazed with a... (More)
Nickel phosphide is a valuable material in high-temperature brazing and joining applications, offering excellent thermal stability for temperatures up to 400°C. Nickel phosphide is used as powder form for joining applications and therefore it is imperative to study the formation as well as interaction of Ni2P particles with Brazing with nickel-chromium-based fillers is widely used to join stainless steel components in applications such as heat exchangers, where strong, corrosion-resistant joints are essential. Silicon and boron additives lower the filler melting temperature but can promote the formation of chromium-rich precipitates near the joint. This study characterizes such precipitates in AISI 316 stainless steel brazed with a Ni-Cr-Si-B filler using high resolution synchrotron hard X-ray fluorescence (XRF) and diffraction (XRD). XRF identified Cr-rich precipitates, while XRD revealed diffraction patterns consistent with space group number 70, with lattice parameters a = 4.26 Å, b = 7.38 Å, and c = 14.70 Å. Combined with SEM XEDS analysis, the results suggest the precipitates are Cr₂B or (Cr,Fe)₂B. (Less)
Please use this url to cite or link to this publication:
author
; ; ; ; ; ; and
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
keywords
Stainless steel 316L, Synchrotron diffraction, X-ray fluorescence spectroscopy, High resolution spectroscopy, Max IV, Brazing, Joining, Bonding, Scanning electron microscopy, NanoMAX, Energy dispersive X-ray spectroscopy
host publication
Brazing, high temperature brazing and diffusion bonding : LÖT 2025 - LÖT 2025
series title
DVS Berichte
volume
399
article number
3
edition
DVS Berichte
pages
6 pages
publisher
DVS Media GmbH, Düsseldorf 2025, Printing by WirmachenDruck GmbH, Backnang
conference name
The 14th International Conference on Brazing, High Temperature Brazing and Diffusion Bonding
conference location
Aachen, Germany
conference dates
2025-06-24 - 2025-06-26
ISSN
0418-9639
ISBN
978-3-96144-295-9
978-3-96144-294-2
DOI
10.53192/LOET20250114
language
English
LU publication?
yes
id
e145fdcb-f9aa-4084-9747-5a36c74ee1c1
date added to LUP
2025-08-30 11:57:00
date last changed
2025-09-19 02:50:18
@inproceedings{e145fdcb-f9aa-4084-9747-5a36c74ee1c1,
  abstract     = {{Nickel phosphide is a valuable material in high-temperature brazing and joining applications, offering excellent thermal stability for temperatures up to 400°C. Nickel phosphide is used as powder form for joining applications and therefore it is imperative to study the formation as well as interaction of Ni2P particles with Brazing with nickel-chromium-based fillers is widely used to join stainless steel components in applications such as heat exchangers, where strong, corrosion-resistant joints are essential. Silicon and boron additives lower the filler melting temperature but can promote the formation of chromium-rich precipitates near the joint. This study characterizes such precipitates in AISI 316 stainless steel brazed with a Ni-Cr-Si-B filler using high resolution synchrotron hard X-ray fluorescence (XRF) and diffraction (XRD). XRF identified Cr-rich precipitates, while XRD revealed diffraction patterns consistent with space group number 70, with lattice parameters a = 4.26 Å, b = 7.38 Å, and c = 14.70 Å. Combined with SEM XEDS analysis, the results suggest the precipitates are Cr₂B or (Cr,Fe)₂B.}},
  author       = {{Lenrick, F. and Lazar, I. and Rajashekar, P. and Yondu, I. and Bhattacharya, R. and Slama, Martin and Knutsson, Axel and Mikkelsen, A.}},
  booktitle    = {{Brazing, high temperature brazing and diffusion bonding : LÖT 2025}},
  isbn         = {{978-3-96144-295-9}},
  issn         = {{0418-9639}},
  keywords     = {{Stainless steel 316L; Synchrotron diffraction; X-ray fluorescence spectroscopy; High resolution spectroscopy; Max IV; Brazing; Joining; Bonding; Scanning electron microscopy; NanoMAX; Energy dispersive X-ray spectroscopy}},
  language     = {{eng}},
  pages        = {{114--119}},
  publisher    = {{DVS Media GmbH, Düsseldorf  2025, Printing by WirmachenDruck GmbH, Backnang}},
  series       = {{DVS Berichte}},
  title        = {{Synchrotron X-ray study of vacuum brazed 316L stainless steel joints}},
  url          = {{http://dx.doi.org/10.53192/LOET20250114}},
  doi          = {{10.53192/LOET20250114}},
  volume       = {{399}},
  year         = {{2025}},
}