On the Development of Grain-Orientation-Dependent and Inter-Phase Stresses in a Super Duplex Stainless Steel under Uniaxial Loading

2006 ◽  
Vol 524-525 ◽  
pp. 917-922 ◽  
Author(s):  
Ru Lin Peng ◽  
Yan Dong Wang ◽  
Guo Cai Chai ◽  
Nan Jia ◽  
Sten Johansson ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Stainless Steel ◽  
Neutron Diffraction ◽  
Grain Orientation ◽  
Super Duplex Stainless Steel ◽  
Lattice Strains ◽  
Duplex Steel ◽  
In Situ Neutron Diffraction ◽  
Phase Stresses

Microstresses due to intergranular and inter-phase interactions in an austenitic-ferritic super duplex steel (SAF 2507) under uniaxial compressive deformation have been studied by in-situ neutron diffraction experiments. Lattice strains of several hkl planes of austenite respective ferrite were mapped as a function of sample direction at a number of load levels during loading into the plastic regime and unloading. The analysis of the experimental results has shown that during loading both grain-orientation-dependent and inter-phase stresses were generated under plastic deformation that was inhomogeneous at the microstructural level. Residual stresses depending on the grain-orientation and phase have been found after unloading. The results also indicate stronger intergranular interactions among the studied hkl planes of austenite than those of ferrite.

In-Situ Neutron Diffraction Study of the Behavior of AL6XN Stainless Steel Under Biaxial Loading

2007 ◽  
Vol 1027 ◽  
Author(s):  
Michael Gharghouri ◽  
Tito Marin ◽  
Ronald B Rogge ◽  
Paul R Dawson
Keyword(s):  
Stainless Steel ◽  
Neutron Diffraction ◽  
Internal Pressure ◽  
Axial Load ◽  
Biaxial Loading ◽  
Axial Loading ◽  
Distinct Advantage ◽  
Lattice Strains ◽  
In Situ Neutron Diffraction

AbstractIn–situ neutron diffraction has been used to measure lattice strains parallel to two principal stress directions in biaxially-loaded AL6XN stainless steel. A new fixture was developed for loading thin-walled tubular specimens through combinations of internal pressure and axial loading. Under these conditions, the principal directions (σzz and σθθ in a cylindrical r, θ, z coordinate system) remain constant with respect to the initial crystallographic texture regardless of the level of biaxiality, a distinct advantage for diffraction experiments over the traditional tension/torsion tests for which this condition does not hold. Specimens were first pressurized to the level required to obtain a chosen value of σθθ. The axial load was then increased to reach the yield surface at different σθθ/σzz ratios, ranging from uniaxial to balanced biaxial loading (0, 0.4, 0.7, 1 according to Tresca). The {200}, {220}, {222}, and {311} reflections were measured in the axial and hoop directions as a function of axial load. A sequence of axial loading/unloading episodes was applied for different levels of plastic deformation. Under uniaxial tension, the {200} reflection showed the highest axial strains, followed by the {311}, and {220}/{222} reflections. With increasing internal pressure (biaxiality), the axial lattice strains corresponding to a given axial stress tended to decrease, and the responses of the various reflections tended to merge.

Evaluating the Mechanical Behavior of 316 Stainless Steel at the Microscale Using Finite Element Modelling and In-Situ Neutron Scattering

2010 ◽  
Author(s):  
Dong-Feng Li ◽  
Noel P. O’Dowd ◽  
Catrin M. Davies ◽  
Shu-Yan Zhang
Keyword(s):  
Finite Element ◽  
Stainless Steel ◽  
Finite Element Modelling ◽  
Mechanical Response ◽  
Fe Model ◽  
Lattice Strains ◽  
Crystallographic Slip ◽  
In Situ Neutron Diffraction ◽  
Elastic Lattice

In this study, the deformation behavior of an austenitic stainless steel is investigated at the microscale by means of in-situ neutron diffraction (ND) measurements in conjunction with finite-element (FE) simulations. Results are presented in terms of (elastic) lattice strains for selected grain (crystallite) families. The FE model is based on a crystallographic (slip system based) representation of the deformation at the microscale. The present study indicates that combined in-situ ND measurement and micromechanical modelling provides an enhanced understanding of the mechanical response at the microscale in engineering steels.

Lattice Strain Pole Figures Analysis in Titanium during Uniaxial Deformation

2017 ◽  
Vol 905 ◽  
pp. 74-80
Author(s):  
David Gloaguen ◽  
Baptiste Girault ◽  
Jamal Fajoui ◽  
Vincent Klosek ◽  
Marie José Moya
Keyword(s):  
Experimental Data ◽  
Neutron Diffraction ◽  
Lattice Strain ◽  
Pure Titanium ◽  
Tensile Load ◽  
Uniaxial Tensile ◽  
Lattice Strains ◽  
Pole Figures ◽  
In Situ Neutron Diffraction

A theoretical and experimental study was carry out to investigate deformation mechanisms in a textured titanium alloy. In situ neutron diffraction measurements were performed to analyze different {hk.l} family planes ({10.0}, {10.1}, {11.0} and {00.2}) and determine the corresponding internal strain pole figures. This method was applied to a pure titanium (a-Ti) submitted to a uniaxial tensile load up to 2 %. The experimental data was then used to validate the EPSC model in order to predict the distribution of lattice strains determined by neutron diffraction for various diffraction vector directions. This comparison reveals that the model results were in good agreement with the experimental data and the simulations reproduced the lattice strain development observed on the strain pole figures determined by neutron diffraction.

Elastoplastic Deformation and Damage Process in Duplex Steel Studied Using Synchrotron and Neutron Diffraction

2017 ◽  
Vol 905 ◽  
pp. 9-16
Author(s):  
Yu Chen Zhao ◽  
Léa Le Joncour ◽  
Andrzej Baczmański ◽  
Manuel François ◽  
Sebastian Wroński ◽  
...  
Keyword(s):  
Neutron Diffraction ◽  
Synchrotron Diffraction ◽  
X Ray ◽  
Slip Mechanism ◽  
Lattice Strains ◽  
Duplex Steel ◽  
Consistent Model ◽  
Damage Process ◽  
Crystallographic Planes

In the present work, the mechanical behavior of phases in duplex steel during tensile test was studied. Special interest was taken in the analysis of damage process just before failure. In this aim two diffraction methods: in-situ time of flight neutron diffraction and X-ray synchrotron diffraction were applied. Using diffraction data, the slip mechanism on crystallographic planes during plastic deformation was investigated. In the case of aged UR45N steel, it was found that significant softening caused by damage process was initiated in the ferritic phase. The lattice strains measured in situ by two above mentioned diffraction methods were compared with prediction of the self-consistent model.

Optimising Sintering in Metal Injection Moulding Using In Situ Neutron Diffraction

2012 ◽  
Vol 706-709 ◽  
pp. 1737-1742 ◽  
Author(s):  
D.J. Goossens ◽  
R.E. Whitfield ◽  
A.J. Studer
Keyword(s):  
Stainless Steel ◽  
High Temperature ◽  
Neutron Diffraction ◽  
Injection Moulding ◽  
Phase Evolution ◽  
Rietveld Analysis ◽  
Formation Temperature ◽  
Lower Temperature ◽  
In Situ Neutron Diffraction

The phase evolution during the sintering of metal injection moulded stainless steel, 316Land 17-4PH, has been observed using in situ neutron diffraction and Rietveld analysis. The formationof the ferrite phase in the final product is associated with the production of -ferrite at high temperatures.Coexistence of phases at high temperature is thought to allow the segregation of alloyingelements, stabilising the ferrite to lower temperature. To prevent ferrite in the final products the sinteringmust occur at a lower temperature than that at which -ferrite is formed. An alternative regimeis proposed in which the temperature would be cycled around the formation temperature of -ferrite.

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