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

作　　者：Kun Yu Yuan Zhang Xiao-Dan Yuan Li-Bin Zhao Zhi-Jun Li 

机构地区：[1]Shanghai Institute of Applied Physics,Chinese Academy of Sciences,Shanghai 201800,China [2]Nuclear and Radiation Safety Center,Beijing 100082,China

出　　处：《Nuclear Science and Techniques》2024年第11期73-81,共9页核技术（英文）

基　　金：supported by the Technology Star of Shanghai Institute of Applied Physics,Chinese Academy of Sciences(No.E2551130);the Youth Innovation Promotion Association,Chinese Academy of Sciences(No.E2292202).

摘　　要：The evolution of the microstructure and tensile rupture mechanism of laser welds in UNS N10003 alloy exposed to 700℃are investigated.Fine M_(6)C carbides precipitate around the primary eutectic M_(6)C-γcarbides in the fusion zone after 100 h of exposure.During long-term thermal exposure,the size of the fine M_(6)C carbides increased.The eutectic M_(6)C-γcarbides in the as-welded fusion zone transformed into spherical M_(6)C carbides as the exposure time extends to 10000 h.Additionally,the spherical M_(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)C-γcarbides and the coarsening of M_(6)C carbides.

关 键 词：UNS N10003 alloy Laser welding M_(6)C Long-term thermal exposure 

分 类 号：TL341[核科学技术—核技术及应用] TG456.7[金属学及工艺—焊接]