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Title: High stereographic resolution texture and residual stress evaluation using time-of-flight neutron diffraction

Journal Article · · Journal of Applied Crystallography (Online)
ORCiD logo [1]; ORCiD logo [2];  [3];  [1]; ORCiD logo [4];  [2]; ORCiD logo [5];  [6]; ORCiD logo [7];  [2];  [1]
  1. Japan Atomic Energy Agency (JAEA), Ibaraki (Japan)
  2. Japan Atomic Energy Agency (JAEA), Ibaraki (Japan). J-PARC Center
  3. Univ. of Tokyo (Japan). Dept. of Materials Engineering
  4. Comprehensive Research Org. for Science and Society, Ibaraki (Japan). Neutron Science and Technology Center
  5. Los Alamos National Lab. (LANL), Los Alamos, NM (United States). LANSCE
  6. Univ. of Tokyo (Japan). Research Center for Advanced Science and Technology
  7. Japan Atomic Energy Agency (JAEA), Ibaraki (Japan). J-PARC Center; National Inst. for Materials Science (NIMS), Ibaraki (Japan)

Neutron diffraction texture measurements provide bulk averaged textures with excellent grain orientation statistics, even for large-grained materials, owing to the probed volume being of the order of 1 cm3. Furthermore, crystallographic parameters and other valuable microstructure information such as phase fraction, coherent crystallite size, root-mean-square microstrain, macroscopic or intergranular strain and stress, etc. can be derived from neutron diffractograms. A procedure for combined high stereographic resolution texture and residual stress evaluation was established on the pulsed-neutron-source-based engineering materials diffractometer TAKUMI at the Materials and Life Science Experimental Facility of the Japan Proton Accelerator Research Center, through division of the neutron detector panel regions. Pole figure evaluation of a limestone standard sample with a well known texture suggested that the precision obtained for texture measurement is comparable to that of the established neutron beamlines utilized for texture measurement, such as the HIPPO diffractometer at the Los Alamos Neutron Science Center (New Mexico, USA) and the D20 angle-dispersive neutron diffractometer at the Institut Laue–Langevin (Grenoble, France). A high-strength martensite–austenite multilayered steel was employed for further verification of the reliability of simultaneous Rietveld analysis of multiphase textures and macro stress tensors. By using a texture-weighted geometric mean micromechanical (BulkPathGEO) model, a macro stress tensor analysis with a plane stress assumption showed a rolling direction–transverse direction (RD–TD) in-plane compressive stress (about –330 MPa) in the martensite layers and an RD–TD in-plane tensile stress (about 320 MPa) in the austenite layers. The phase stress partitioning was ascribed mainly to the additive effect of the volume expansion during martensite transformation and the linear contraction misfit between austenite layers and newly transformed martensite layers during the water quenching process.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC52-06NA25396
OSTI ID:
1625774
Journal Information:
Journal of Applied Crystallography (Online), Vol. 51, Issue 3; ISSN 1600-5767
Publisher:
International Union of CrystallographyCopyright Statement
Country of Publication:
United States
Language:
English

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Distinct Recrystallization Pathways in a Cold-Rolled Al-2%Mg Alloy Evidenced by In-Situ Neutron Diffraction journal September 2018
Recent Progress of Residual Stress Distribution and Structural Evolution in Materials and Components by Neutron Diffraction Measurement at RSND journal July 2018

Figures / Tables (9)