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Materials 2017, 10(6), 593; doi:10.3390/ma10060593

Neutron Diffraction Evaluation of Near Surface Residual Stresses at Welds in 1300 MPa Yield Strength Steel

1
Department of Engineering Science, University West, SE-461 86 Trollhättan, Sweden
2
Institut Max von Laue-Paul Langevin, 6 rue Jules Horowitz, BP156, F-38042 Grenoble, France
3
ESAB AB, Lindholmsallen 9, 40227 Gothenburg, Sweden
*
Author to whom correspondence should be addressed.
Academic Editor: Yong-Cheng Lin
Received: 5 April 2017 / Revised: 25 May 2017 / Accepted: 27 May 2017 / Published: 29 May 2017
(This article belongs to the Section Structure Analysis and Characterization)
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Abstract

Evaluation of residual stress in the weld toe region is of critical importance. In this paper, the residual stress distribution both near the surface and in depth around the weld toe was investigated using neutron diffraction, complemented with X-ray diffraction. Measurements were done on a 1300 MPa yield strength steel welded using a Low Transformation Temperature (LTT) consumable. Near surface residual stresses, as close as 39 µm below the surface, were measured using neutron diffraction and evaluated by applying a near surface data correction technique. Very steep surface stress gradients within 0.5 mm of the surface were found both at the weld toe and 2 mm into the heat affected zone (HAZ). Neutron results showed that the LTT consumable was capable of inducing near surface compressive residual stresses in all directions at the weld toe. It is concluded that there are very steep stress gradients both transverse to the weld toe line and in the depth direction, at the weld toe in LTT welds. Residual stress in the base material a few millimeters from the weld toe can be very different from the stress at the weld toe. Care must, therefore, be exercised when relating the residual stress to fatigue strength in LTT welds. View Full-Text
Keywords: residual stress; high strength steel; neutron diffraction; weld toe; low transformation temperature welding consumable residual stress; high strength steel; neutron diffraction; weld toe; low transformation temperature welding consumable
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Harati, E.; Karlsson, L.; Svensson, L.-E.; Pirling, T.; Dalaei, K. Neutron Diffraction Evaluation of Near Surface Residual Stresses at Welds in 1300 MPa Yield Strength Steel. Materials 2017, 10, 593.

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