Paper Title:
Investigation of Residual Stress in Laser Formed Mild Steel Plates Using Neutron Diffraction
  Abstract

Forming of metal plates with a high-power laser beam is a flexible materials forming technique. Bending results from the establishment of a steep temperature gradient through the material thickness which leads to non-uniform thermal expansion/contraction and subsequently residual stresses. It is important to characterize these residual stresses as a function of process parameters such as line energy (LE) to optimize treatment conditions and to gain an insight into the mechanism of the formation of the final geometries. Non-destructive neutron diffraction measurements were carried out on ENGIN-X at ISIS and KOWARI at ANSTO to map the residual stress distribution around the heat affected zone (HAZ) of laser deformed mild steel plates for single and multiple passes as a function of line energy (LE), the primary laser forming process parameter. It was found that in the centre of the HAZ, longitudinal residual stresses are tensile and dominant, transverse stresses are predominantly tensile and normal stresses are compressive and close to zero. The residual strain in longitudinal direction increased with LE and number of passes until yielding. Even higher heat input decreased the magnitude of the cusp, but not its total height. The comparison of a stress-free reference sample, measured at both facilities, showed a small discrepancy in the lattice spacing corresponding to ~ 85 μstrain which is insignificant with respect to the experimental values measured.

  Info
Periodical
Edited by
Y. Akiniwa, K. Akita and H. Suzuki
Pages
123-128
DOI
10.4028/www.scientific.net/MSF.652.123
Citation
S. M. Knupfer, A. M. Paradowska, O. Kirstein, A. Moore, "Investigation of Residual Stress in Laser Formed Mild Steel Plates Using Neutron Diffraction", Materials Science Forum, Vol. 652, pp. 123-128, 2010
Online since
May 2010
Export
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: M. Siddique, Muhammad Abid, H.F. Junejo, R.A. Mufti
Abstract:This paper presents results of detailed three-dimensional finite element simulation of residual stress distribution in welded Pipe-Flange...
79
Authors: Jun Wei Zhang, Xiao Dong Hu, Dan Zhang
Abstract:Strip casting process is a kind of promising near net shape technology for producing magnesium alloys strip. The microstructure and...
1012
Authors: Guang Tao Zhou, Wen De Hou, Zhe Wang, Zhong Ming Xue
Abstract:In conventional TIG welding, copper weld joint and its heat affected zone (HAZ) have the disadvantage of softening. In this paper, the new...
348
Authors: Cameron Munro, Allison E. Nolting, Xin Jin Cao, Priti Wanjara
Chapter 24: Welding & Joining
Abstract:High strength low alloy (HSLA) steel, namely HSLA-65, has shown promise as a replacement for more common high strength shipbuilding steels....
2992
Authors: S.M. Manladan, B.O. Onyekpe
Abstract:This paper presents the result of an investigation of the effect of postweld heat treatment on the mechanical properties of weld in 0.36%C...
6