Neutron Diffraction Residual Stress Evaluation and Numerical Modeling of Coating Obtained by PTA Process

2010 ◽  
Vol 638-642 ◽  
pp. 594-599
Author(s):  
Abdeljalil Nady ◽  
Herve Bonnefoy ◽  
Vincent Klosek ◽  
Marie Helene Mathon ◽  
Alain Lodini
Keyword(s):  
Neutron Diffraction ◽  
Residual Stresses ◽  
Complex Geometry ◽  
Steel Substrate ◽  
Diffraction Method ◽  
Stress Evaluation ◽  
Physical Conditions ◽  
Abaqus Code ◽  
Neutron Diffraction Method ◽  
Good Agreement

The Stellite 6 hardfacing alloys have been deposited on steel substrate using a Plasma Transferred Arc (PTA) with complex geometry. The residual strain of the PTA technology at the surface of coating layer and the interface were determined by neutron diffraction method. In the present work, a numerical model for the residual stresses formed during the PTA process with physical conditions and mechanical properties using the Abaqus code is analysed. The result reveals that the residual stresses obtained by the numerical simulation are in very good agreement with experimental results by the neutron diffraction.

Residual Stress Evaluation of Ni Based Weld Metal Using Neutron Diffraction Method

2006 ◽  
Vol 524-525 ◽  
pp. 697-702 ◽  
Author(s):  
Shinobu Okido ◽  
Hiroshi Suzuki ◽  
K. Saito
Keyword(s):  
Residual Stress ◽  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Neutron Diffraction ◽  
Weld Metal ◽  
Diffraction Method ◽  
Fem Analysis ◽  
Butt Weld ◽  
Stress Evaluation ◽  
Neutron Diffraction Method

Residual stress generated in Type-316 austenitic stainless steel butt-weld jointed by Inconel-182 was measured using a neutron diffraction method and compared with values calculated using FEM analysis. The measured values of Type-316 austenitic stainless steel as base material agreed well with the calculated ones. The diffraction had high intensity and a sharp profile in the base metal. However, it was difficult to measure the residual stress at the weld metal due to very weak diffraction intensities. This phenomenon was caused by the texture in the weld material generated during the weld procedure. As a result, this texture induced an inaccurate evaluation of the residual stress. Procedures for residual stress evaluation to solve this textured material problem are discussed in this paper. As a method for stress evaluation, the measured strains obtained from a different diffraction plane with strong intensity were modified with the ratio of the individual elastic constant. The values of residual stress obtained using this method were almost the same as those of the standard method using Hooke’s law. Also, these residual stress values agreed roughly with those from the FEM analysis. This evaluation method is effective for measured samples with a strong texture like Ni-based weld metal.

Study of Interactive Stresses in Thin WC-Co Coating of Thick Mild Steel Substrate Using High-Precision Neutron Diffraction

2013 ◽  
Vol 772 ◽  
pp. 161-165
Author(s):  
Andrew M. Venter ◽  
Vladimir Luzin ◽  
O. Philip Oladijo ◽  
L.A. Cornish ◽  
Natasha Sacks
Keyword(s):  
Neutron Diffraction ◽  
Residual Stresses ◽  
Mild Steel ◽  
Steel Substrate ◽  
Stress Gradient ◽  
Gauge Volume ◽  
Measured Stress ◽  
Steel Substrates ◽  
Coating Stress ◽  
Good Agreement

Investigations of interaction residual stresses between thin WC-Co surface coated layers on thick mild steel substrates have successfully been performed with neutron diffraction. This systematic approach was conducted on the reference grit-blasted substrates and their HVOF coated WC-Co products. Using a sub-millimeter gauge volume, precisely positioned, the stress gradient through the coated and non-coated substrates were determined and used to derive the coating stress condition prevailing in the thin coating by applying the stress balance (Stoney) approach. In addition, the average stress in each 200 μm thick coating was measured directly with very good agreement obtained between the calculated and measured stress values. Investigations were extended to determine the thermal nature of the residual stresses by studying the annealed counterpart samples as well to follow the evolution of the residual stress upon annealing.

Neutron diffraction measurements of residual stress and plastic deformation in an aluminium alloy weld

1988 ◽  
Vol 23 (4) ◽  
pp. 201-211 ◽  
Author(s):  
D J Smith ◽  
R H Leggatt ◽  
G A Webster ◽  
H J Macgillivray ◽  
P J Webster ◽  
...  
Keyword(s):  
Neutron Diffraction ◽  
Plastic Strain ◽  
Residual Stresses ◽  
Aluminium Alloy ◽  
Three Dimensional ◽  
Diffraction Method ◽  
Accurate Indication ◽  
Neutron Diffraction Technique ◽  
Neutron Diffraction Method ◽  
Alloy Weld

The neutron diffraction technique for measuring residual stresses non-destructively in an aluminium alloy weld has been examined. Calibration experiments have been performed to determine the influence of prior plastic strain and surface effects. Comparisons have also been made with strain gauge methods using the destructive block removal and layering technique for measuring the residual stresses. It has been shown that the neutron diffraction method gives an accurate indication of the three dimensional stress distribution present in a weld and that it can also be employed to estimate the amount of prior plastic strain encountered.

Local Structure of the Amorphous Ni25Zr75-Alloy by Using the Isotope-Substitution Neutron Diffraction Method

1991 ◽  
Vol 46 (11) ◽  
pp. 951-954
Author(s):  
W.-M. Kuschke ◽  
P. Lamparter ◽  
S. Steeb
Keyword(s):  
Neutron Diffraction ◽  
Local Structure ◽  
Short Range ◽  
Short Range Order ◽  
Diffraction Method ◽  
Isotopic Substitution ◽  
Isotope Substitution ◽  
Coordination Numbers ◽  
Structure Factors ◽  
Neutron Diffraction Method

AbstractUsing neutron diffraction as well as the method of isotopic substitution the partial Bhatia-Thornton as well as the partial Faber-Ziman structure factors of amorphous Ni25Zr75 were determined. A compound forming tendency was found. The atomic distances, partial coordination numbers, and the chemical short range order parameter are evaluated.

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