Time-Resolved X-Ray Diffraction Stress Analysis during Laser Surface Hardening of Steel

2014 ◽  
Vol 69 (6) ◽  
pp. 360-367 ◽  
Author(s):  
V. Kostov ◽  
J. Gibmeier ◽  
A. Wanner
Keyword(s):  
Stress Analysis ◽  
Surface Hardening ◽  
Laser Surface ◽  
X Ray Diffraction ◽  
Time Resolved ◽  
X Ray ◽  
Laser Surface Hardening

scholarly journals Time-Resolved X-Ray Stress Analysis in Multilayered Thin Films during Continuous Loading: Use of 2D Remote Detection

2014 ◽  
Vol 996 ◽  
pp. 878-883
Author(s):  
Raphaëlle Guillou ◽  
Pierre-Olivier Renault ◽  
Eric Le Bourhis ◽  
Philippe Goudeau ◽  
Pierre Godard ◽  
...  
Keyword(s):  
Stress State ◽  
Mechanical Behavior ◽  
Stress Analysis ◽  
Biaxial Loading ◽  
X Ray Diffraction ◽  
Time Resolved ◽  
X Ray ◽  
Multiphase Materials ◽  
Residual Stress State ◽  
Multilayered Thin Films

Synchrotron X-ray diffraction is a powerful tool to analyse the mechanical behavior of multiphase materials due to its selectivity. Simultaneous stress analysis of both phases of a W/Cu thin multilayer has been performed during a continuous biaxial loading on DiffAbs beamline at SOLEIL synchrotron (France). The use of a 2D detector with a large sample-detector distance is shown to give relatively accurate applied stress analysis even if only a small part of the usual ψ range of the sin2ψ method is considered. The results show the failure of the thin film multilayer while the W components are still under a strong compressive stress state of-3 GPa. It is concluded that the mechanical behavior is in fact mainly governed by the residual stress state.

Laser Surface Hardening of Steel: Effect of Process Atmosphere on the Microstructure and Residual Stresses

2013 ◽  
Vol 772 ◽  
pp. 149-153 ◽  
Author(s):  
Vladimir Kostov ◽  
Jens Gibmeier ◽  
Alexander Wanner
Keyword(s):  
Residual Stress ◽  
Residual Stresses ◽  
Surface Hardening ◽  
Local Heating ◽  
Laser Surface ◽  
Inert Gas ◽  
X Ray ◽  
Depth Direction ◽  
Laser Surface Hardening ◽  
Gas Atmosphere

The effect of processing atmosphere on the microstructure and residual stresses are studied for laser surface hardening on steel samples of grade AISI 4140. Samples were hardened in air, vacuum and inert gas atmosphere (Helium) by means of a stationary laser beam. A high-power diode laser (HPDL) system was used in combination with a custom-designed process chamber. Residual stress distributions in lateral and in depth direction were analysed after laser processing by means of X-ray diffraction according to the well known sin² - method. X-ray residual stress analyses were supplemented by microscopic investigations of the local microstructure. The results indicate a widening of the compressive stressed region in lateral as well as in depth direction by surface hardening in inert gas atmosphere compared to laser surface hardening in air or vacuum atmosphere. This is due to the local heating flux distribution during the laser assisted heat treatment which is strongly affected by the processing atmosphere an leads to an extension of the hardening zone when using helium as inert gas.

scholarly journals Effect of Preloading on Local Residual Stresses Induced by Laser Surface Hardening of Steel

2014 ◽  
Vol 996 ◽  
pp. 562-567 ◽  
Author(s):  
Vladimir Kostov ◽  
Jens Gibmeier ◽  
Klaudia Lichtenberg ◽  
Alexander Wanner
Keyword(s):  
Residual Stress ◽  
Residual Stresses ◽  
Surface Hardening ◽  
Process Zone ◽  
Laser Surface ◽  
External Loading ◽  
Strong Impact ◽  
Near Surface ◽  
X Ray ◽  
Laser Surface Hardening

The effect of defined preloading in the tensile and compressive regime on the near surface (residual) stress distributions, which result from laser surface hardening, is systematically studied in-situ, i.e. under the applied preload and after unloading. Samples made of steel grade AISI 4140 are defined surface hardened by means of a high-power diode laser (HPDL) system during uniaxial compressive elastic loading at-300 MPa as well as during uniaxial elastic tensile loading at 300 MPa using a custom designed 4-point-bending device, which can be mounted on an X-ray diffractometer. The results of X-ray stress analysis were compared to data derived for a sample state unaffected by any preload. Without external loading compressive residual stresses are induced inside the process zone that are balanced by tensile residual stresses outside this zone. The investigations show that external loading in the tensile and compressive regime has a strong impact on the resulting lateral residual stress distribution in loading direction. The results further indicate that undesirable tensile residual stresses outside the process zone can even be suppressed by using a defined appropriate preloading in the tensile regime.

scholarly journals Fast in situ phase and stress analysis during laser surface treatment: A synchrotron x-ray diffraction approach

2012 ◽  
Vol 83 (11) ◽  
pp. 115101 ◽  
Author(s):  
V. Kostov ◽  
J. Gibmeier ◽  
F. Wilde ◽  
P. Staron ◽  
R. Rössler ◽  
...  
Keyword(s):  
Surface Treatment ◽  
Stress Analysis ◽  
Laser Surface ◽  
X Ray Diffraction ◽  
Laser Surface Treatment ◽  
X Ray

scholarly journals Direct observations of shock-induced melting in a porous solid using time-resolved x-ray diffraction

2020 ◽  
Vol 4 (6) ◽  
Author(s):  
A. Mandal ◽  
B. J. Jensen ◽  
M. C. Hudspeth ◽  
S. Root ◽  
R. S. Crum ◽  
...  
Keyword(s):  
Porous Solid ◽  
X Ray Diffraction ◽  
Time Resolved ◽  
X Ray ◽  
Direct Observations

scholarly journals Experimental investigation on a novel approach for laser surface hardening modelling

2021 ◽  
Vol 16 (1) ◽  
Author(s):  
L. Orazi ◽  
A. Rota ◽  
B. Reggiani
Keyword(s):  
Surface Hardening ◽  
Carbon Diffusion ◽  
Industrial Applications ◽  
Laser Surface ◽  
Simplified Approach ◽  
Laser Surface Hardening ◽  
Novel Approach ◽  
Laser Treatments ◽  
High Flexibility ◽  
Short Time

AbstractLaser surface hardening is rapidly growing in industrial applications due to its high flexibility, accuracy, cleanness and energy efficiency. However, the experimental process optimization can be a tricky task due to the number of involved parameters, thus suggesting for alternative approaches such as reliable numerical simulations. Conventional laser hardening models compute the achieved hardness on the basis of microstructure predictions due to carbon diffusion during the process heat thermal cycle. Nevertheless, this approach is very time consuming and not allows to simulate real complex products during laser treatments. To overcome this limitation, a novel simplified approach for laser surface hardening modelling is presented and discussed. The basic assumption consists in neglecting the austenite homogenization due to the short time and the insufficient carbon diffusion during the heating phase of the process. In the present work, this assumption is experimentally verified through nano-hardness measurements on C45 carbon steel samples both laser and oven treated by means of atomic force microscopy (AFM) technique.

scholarly journals Laser surface hardening of SS316L

2021 ◽  
Vol 1070 (1) ◽  
pp. 012107
Author(s):  
Ganesh Dongre ◽  
Avadhoot Rajurkar ◽  
Ramesh Gondil ◽  
Nandan Jaju
Keyword(s):  
Surface Hardening ◽  
Laser Surface ◽  
Laser Surface Hardening

scholarly journals Bulk modulus of H2O across the ice VII–ice X transition measured by time-resolved x-ray diffraction in dynamic diamond anvil cell experiments

2021 ◽  
Vol 103 (6) ◽  
Author(s):  
A. S. J. Méndez ◽  
F. Trybel ◽  
R. J. Husband ◽  
G. Steinle-Neumann ◽  
H.-P. Liermann ◽  
...  
Keyword(s):  
Bulk Modulus ◽  
Diamond Anvil Cell ◽  
X Ray Diffraction ◽  
Time Resolved ◽  
X Ray ◽  
Diamond Anvil
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