Enhancement of fatigue resistance for 316L welds produced by magnetic field assisted laser-MIG hybrid welding
Enhancement of fatigue resistance for 316L welds produced by magnetic field assisted laser-MIG hybrid welding
复制标题
磁场辅助激光-MIG 混合焊接 316L 焊缝的疲劳抗力增强
DOI：
10.1016/j.jmatprotec.2017.11.030
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发表时间：
2018-04-01
影响因子：
6.3
通讯作者：
Wang, Chunming
中科院分区：
文献类型：
--
作者：
Chen, Rong;Jiang, Ping;Wang, Chunming
24mT磁场辅助激光-MIG复合焊接的焊缝空气中裂纹扩展速率(CGR)降低了33%。16mT磁场辅助焊接的焊缝在3.5%氯化钠溶液中的CGR降低了20%。用电子背散射衍射仪(EBSD)研究了焊缝织构的变化。外加磁场降低了热梯度，改变了最大热梯度(del T-max)的取向，导致织构强度减弱，铁素体减少。降低了{100}面和取向的强度，提高了循环塑性变形的抗力。减少的铁素体增加了裂纹尖端应变诱发马氏体的体积，提高了疲劳抗裂性。
Crack growth rate (CGR) in air for welds produced by 24 mT magnetic field assisted laser-MIG hybrid welding was decreased by 33%. CGR in 3.5% NaCl solution for welds produced by 16 mT magnetic field assisted welding was reduced by 20%. Texture variation in welds was investigated through electron backscattered diffraction (EBSD). External magnetic field lowered thermal gradient and changed orientations of maximum thermal gradient (del T-max), resulting in weaker texture intensity and less ferrite. Reduced intensity of {100} planes and orientations improved resistance to cyclic plastic deformation. Reduced ferrite increased the volume of strain induced martensite at crack tip, improving fatigue cracking resistance.