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Evolution of microstructure and residual stress under various vibration modes in 304 stainless steel welds.

Hsieh CC, Wang PS, Wang JS, Wu W - ScientificWorldJournal (2014)

Bottom Line: The experimental results indicate that the temperature gradient can be increased, accelerating nucleation and causing grain refinement during this process.A residual stress can obviously be increased, producing an excellent effect on stress relief at a resonant frequency.The stress relief effect with an eccentric circulating vibrator was better than that obtained using a magnetic telescopic vibrator.

View Article: PubMed Central - PubMed

Affiliation: Department of Materials Science and Engineering, National Chung Hsing University, 250 Kuo-Kuang Road, Taichung 402, Taiwan.

ABSTRACT
Simultaneous vibration welding of 304 stainless steel was carried out with an eccentric circulating vibrator and a magnetic telescopic vibrator at subresonant (362 Hz and 59.3 Hz) and resonant (376 Hz and 60.9 Hz) frequencies. The experimental results indicate that the temperature gradient can be increased, accelerating nucleation and causing grain refinement during this process. During simultaneous vibration welding primary δ -ferrite can be refined and the morphologies of retained δ-ferrite become discontinuous so that δ-ferrite contents decrease. The smallest content of δ-ferrite (5.5%) occurred using the eccentric circulating vibrator. The diffraction intensities decreased and the FWHM widened with both vibration and no vibration. A residual stress can obviously be increased, producing an excellent effect on stress relief at a resonant frequency. The stress relief effect with an eccentric circulating vibrator was better than that obtained using a magnetic telescopic vibrator.

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The relationship between the vibration frequency and the residual stress.
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Related In: Results  -  Collection


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fig14: The relationship between the vibration frequency and the residual stress.

Mentions: Figure 14 shows the relationship between residual stress and the vibration mode. The residual stress is about 344 MPa without vibration and it was decreased at subresonant (289 MPa) and resonant (132 MPa) frequencies using a magnetic telescopic vibrator (TX-VSR). However, the residual stress was also decreased at subresonant (261 MPa) and resonant (117 MPa) frequencies using an eccentric circulating vibrator (Meta-Lax). The above results indicate that residual stress can be relieved after vibration welding; the effect of the stress relief is excellent at resonant frequency. The decreased level of the TX-VSR and the Meta-Lax at a resonant and subresonant frequency reached 61% and 66% and 14% and 24%, respectively. The experimental results indicated that high vibration frequency had no beneficial effect on residual stress relief. There appears to be no direct proportional relationship between vibration frequency and residual stress.


Evolution of microstructure and residual stress under various vibration modes in 304 stainless steel welds.

Hsieh CC, Wang PS, Wang JS, Wu W - ScientificWorldJournal (2014)

The relationship between the vibration frequency and the residual stress.
© Copyright Policy - open-access
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC3926365&req=5

fig14: The relationship between the vibration frequency and the residual stress.
Mentions: Figure 14 shows the relationship between residual stress and the vibration mode. The residual stress is about 344 MPa without vibration and it was decreased at subresonant (289 MPa) and resonant (132 MPa) frequencies using a magnetic telescopic vibrator (TX-VSR). However, the residual stress was also decreased at subresonant (261 MPa) and resonant (117 MPa) frequencies using an eccentric circulating vibrator (Meta-Lax). The above results indicate that residual stress can be relieved after vibration welding; the effect of the stress relief is excellent at resonant frequency. The decreased level of the TX-VSR and the Meta-Lax at a resonant and subresonant frequency reached 61% and 66% and 14% and 24%, respectively. The experimental results indicated that high vibration frequency had no beneficial effect on residual stress relief. There appears to be no direct proportional relationship between vibration frequency and residual stress.

Bottom Line: The experimental results indicate that the temperature gradient can be increased, accelerating nucleation and causing grain refinement during this process.A residual stress can obviously be increased, producing an excellent effect on stress relief at a resonant frequency.The stress relief effect with an eccentric circulating vibrator was better than that obtained using a magnetic telescopic vibrator.

View Article: PubMed Central - PubMed

Affiliation: Department of Materials Science and Engineering, National Chung Hsing University, 250 Kuo-Kuang Road, Taichung 402, Taiwan.

ABSTRACT
Simultaneous vibration welding of 304 stainless steel was carried out with an eccentric circulating vibrator and a magnetic telescopic vibrator at subresonant (362 Hz and 59.3 Hz) and resonant (376 Hz and 60.9 Hz) frequencies. The experimental results indicate that the temperature gradient can be increased, accelerating nucleation and causing grain refinement during this process. During simultaneous vibration welding primary δ -ferrite can be refined and the morphologies of retained δ-ferrite become discontinuous so that δ-ferrite contents decrease. The smallest content of δ-ferrite (5.5%) occurred using the eccentric circulating vibrator. The diffraction intensities decreased and the FWHM widened with both vibration and no vibration. A residual stress can obviously be increased, producing an excellent effect on stress relief at a resonant frequency. The stress relief effect with an eccentric circulating vibrator was better than that obtained using a magnetic telescopic vibrator.

Show MeSH