Vibratory stress relieving of welded sheet steels of low alloy high strength steel

doi:10.1016/j.matlet.2003.10.002

Materials Letters

Volume 58, Issues 7–8, March 2004, Pages 1396-1399

https://doi.org/10.1016/j.matlet.2003.10.002 Get rights and content

Abstract

Vibratory stress relieving of D6AC and D406A welding steel plates was carried out. The macro-residual stress decreased to 0±25 MPa, which is the same value as can be achieved by hot stress relief.

Introduction

Vibratory stress relief is a new technology. There are some issues in its popularization in China. Many people consider that the macro-residual stress peak value can be relieved, but that the macro-residual stress background value cannot be relieved via vibratory stress relief. Many people are anxious about the increase of the macro-residual stress in vibration, or doubt whether the vibratory stress relief can take the place of hot stress relief.

D6AC and D406A welding steel plate is groove weld. The welding plates were tempered at 310 °C, to decrease the macro-residual stress to a lower value, and to kill off the macro-residual stress peak value. After the above heat treatment, the macro-residual stress decreased to 100 MPa and the macro-residual stress peak was killed off. The vibratory stress relief of D6AC and D406A welding steel plates was carried out under the lower macro-residual stress state. In order to increase vibratory stress in the welding plates, we selected smaller structural stiffness welding plates. The welding plates were 4 mm in thickness and of a smaller structural stiffness. In this way, a larger vibratory stress can be obtained in the welding plates.

Vibratory stress relief is a new technology. The cost of stimulator, the energy charge and the work hours are low, the mechanical properties of component part are not damaged, the macro-residual stress does not reappear in the later service, and it does not contaminate environment [1], [2], [3], [4]. The present research was undertaken to study whether or not vibratory stress relief can take the place of hot stress relief completely and whether or not the macro-residual stress can be decreased to the value that is as low as zero-stress point in vibratory stress relief.

Section snippets

Experimental

The welding plates were D6AC and D406A steel plates. Their composition is shown in Table 1. The D6AC and D406A steel plates are hot rolled plates and annealed. Their microstructures are shown in Fig. 1. Four steel plates were welded together. The welded plates were tempered at 310 °C. The tempering time was half an hour, after which the macro-residual stress peak was killed off and the macro-residual stress decreased to lower level. Vibratory stress relief was carried out at the lower

Experimental results

The macro-residual stresses in the welded steel plates of D6AC and 406A after vibration are shown in Table 3. It is clear that the macro-residual stresses in the welded steel plates of D6AC and D406A were decreased to zero-stress point. The distribution of the macro-residual stress in the welded plates before and after vibration is shown in Fig. 5. In many tested points, the macro-residual stresses decreased to zero-stress point.

Except for two points the macro-residual stresses in the welded

Conclusion

The main conclusions from this work are as follows:

1.
In the vibratory stress relief of the welded steel plates of D6AC and D406A, the macro-residual stresses decrease to 0±25MPa. The macro-residual stresses can decrease to zero-stress point in the above vibratory stress relief.
2.
The vibratory stress relief can take the place of the hot stress relief in welded steel plates of D6AC and D406A.
3.
The key technology in vibratory stress relief is how to increase the vibratory stress in the component parts.

References (4)

M.C. Sun
Ship Engineering
(1992)
M.C. Sun

There are more references available in the full text version of this article.

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