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Suzuki, Hiroshi; Holden, T. M.*
Journal of Strain Analysis for Engineering Design, 41(8), p.575 - 582, 2006/11
Times Cited Count：11 Percentile：74.37(Engineering, Mechanical)In this study, the residual stress distribution in a double-V butt weld plate of 304-type austenitic stainless steel was measured using the neutron diffraction technique with the diffractometer for REsidual Stress Analysis (RESA) located in the JRR-3 (Japan Research Reactor No.3) at the Japan Atomic Energy Agency. Coupon samples were cut from the weld plate in order to follow the changes in chemical and microstructure or effects from type-2 intergranular strains. The residual stresses were measured using the {111}, {002} and {220} reflections. The residual stress derived from {002} reflection is sensitive to intergranular effects, so that when the analysis ignored intergranular effects, the stress variation for the {002} reflection was different from the stresses derived from the other reflections. However, the stress distributions evaluated from the lattice strains for all the reflections were in good agreement, within the error bar of 
35 MPa, after correcting the measured strains by subtracting the intergranular strains derived from the coupon measurements. The consideration of intergranular effects thus improves the accuracy of neutron stress measurements of weldments.
Holden, T. M.*; Suzuki, Hiroshi; Carr, D. G.*
ISIJ International, 46(7), p.959 - 965, 2006/07
Times Cited Count：11 Percentile：37.25(Metallurgy & Metallurgical Engineering)In the last decade a more sophisticated understanding of how to calculate the macroscopic stress from strains measured in neutron diffraction experiments has developed. Strains measured with the aid of a particular reflection may have a component corresponding to the stress field as well as a component corresponding to a type-2 or intergranular stress. The latter originates in inhomogeneous plastic deformation among different grain orientations. One approach is to cut small reference coupons from the component, small in size compared with the variation of the stress field. Cutting destroys the stress field but leaves any chemistry and intergranular effects intact since they are on the scale of the grain size. The difference between the intact sample and the coupon then gives an approximation to the strain associated with the macroscopic stress. Examples of how the intergranular and macroscopic strains and stresses are superposed, are presented for the cases of slightly bent and severely bent steam generator tubing, and for a deformed pressure tube. Welds often represent a situation where plastic deformation has occurred on cooling. In addition, microstructural and compositional changes are often associated with melting, so it is important to have reference coupons as a function of position through the weld zone. Examples of austenitic stainless steel and Zr-alloy welds are presented.
Suzuki, Hiroshi; Holden, T. M.*; Moriai, Atsushi; Minakawa, Nobuaki*; Morii, Yukio
Zairyo, 54(7), p.685 - 691, 2005/07
no abstracts in English
Suzuki, Hiroshi; Holden, T. M.*; Clausen, B.*; Shiota, Yoshinori*; Tomota, Yo*
no journal, ,
In this study, the textures in cold rolled 316 type austenitic stainless plate with 25 % and 75 % reduction as well as the as-received plate were measured using neutron diffraction. The texture was progressed with increase of reduction rate and the typical texture in cold rolling was observed. In addition, the intergranular strains of each reflection at 25 % reduction were also measured. The largest variations of intergranular strain were observed in 200 reflection. Relation of intergranular strains among 111, 200 and 220 reflections is very similar with that with uniaxial deformation reported in previous studies.
