Open AccessMicrostructure and cryogenic toughness of 316LN austenite stainless steel weld metal welded by NG-MAG arc welding
Author(s) -
Liang Li,
Wenkai Xiao,
Jiaqi Zhang,
Zhao Yalu
Publication year - 2020
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1699/1/012027
Subject(s) - charpy impact test , materials science , welding , austenite , metallurgy , microstructure , optical microscope , submerged arc welding , scanning electron microscope , ferrite (magnet) , heat affected zone , gas metal arc welding , toughness , arc welding , composite material , fracture toughness , grain boundary
Using narrow-gap Metal Active Gas (NG-MAG) arc welding, the low-temperature impact toughness and microstructures of the 316LN welded joints have been researched and characterized by Charpy impact test, optical microscopy, scanning electron microscopy and transmission electron microscopy. The results show that the low temperature toughness in the as-welded state is 132J and the toughness of the post-weld heat treatment was 112J. There are many dimples in the impact fracture, which indicated plastic fracture. The ferrite is located at the austenite grain boundary and exhibits a strip shape with a width of about 400 nm.