Effect of long-term thermal exposure on microstructure of laser-welded UNS N10003 alloy

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发表日期：

2024年10月10日

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Kun Yu,
Yuan Zhang,
Xiao-Dan Yuan,
Li-Bin Zhao,
Zhi-Jun Li

摘要

The evolution of the microstructure and tensile rupture mechanism of laser welds in UNS N10003 alloy exposed to ${700}\,^{\circ }\hbox {C}$ $700^{\circ} C$ are investigated. Fine M $_{6}$ $_{6}$ C carbides precipitate around the primary eutectic M $_{6}$ $_{6}$ C- $\gamma$ $γ$ carbides in the fusion zone after 100 h of exposure. During long-term thermal exposure, the size of the fine M $_{6}$ $_{6}$ C carbides increased. The eutectic M $_{6}$ $_{6}$ C- $\gamma$ $γ$ carbides in the as-welded fusion zone transformed into spherical M $_{6}$ $_{6}$ C carbides as the exposure time extends to $10000\,\hbox {h}$ $10000 h$ . Additionally, the spherical M $_{6}$ $_{6}$ C particles exhibit size coarsening with increasing exposure time. The tensile properties of the welded joints are not adversely affected by the evolution of eutectic M $_{6}$ $_{6}$ C- $\gamma$ $γ$ carbides and the coarsening of M $_{6}$ $_{6}$ C carbides.