Abstract
The objective of this work was to analyze the residual stress state in spot welds made in an HY-100 steel disk by an autogenous gas tungsten arc (GTA) welding process. An uncoupled thermal-mechanical finite element (FE) model was developed that took into account the effects of liquid-to-solid and solid-state phase transformations. Effects of variations in mechanical properties due to solid-state phase transformations on residual stresses in the weld were studied. Extensive experimental testing was carried out to determine the mechanical properties of HY-100 steel. The residual stresses in the disk with the spot weld were measured by a neutron diffraction (ND) technique. The FE results are in good agreement with the ND measurements. The results show that the volumetric changes associated with the austenite to martensite phase transformation in HY-100 steel significantly affect residual stresses in the weld fusion zone and the heat affected zone.
| Original language | English |
|---|---|
| Pages (from-to) | 45-54 |
| Number of pages | 10 |
| Journal | Materials Science and Engineering: A |
| Volume | 246 |
| Issue number | 1-2 |
| DOIs | |
| State | Published - May 15 1998 |
Funding
The authors would like to thank Dr C.R. Hubbard and Dr X.L. Wang for reviewing the paper. The research was sponsored in part by an appointment to the Oak Ridge National Laboratory Postdoctoral Research Associates Program administered jointly by the Oak Ridge Institute for Science and Education and Oak Ridge National Laboratory. The research was also sponsored by the US Navy, Office of Naval Research, under interagency agreement DOE No. 1866-E126-A1, Navy No. N000014-92-F-0063 under US Department of Energy contract DE-AC05-96OR22464 with Lockheed Martin Energy Research Corporation.
Keywords
- Finite element method
- Gas tungsten arc
- Neutron diffraction
- Residual stress state