|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Advanced High-Strength Steels
||The Role of Copper in Microstructures and Mechanical Properties of Laser-welded Fe-19Ni-3Mo-1.5Ti Maraging Steel Joint
||Kun Li, Jiguo Shan, Peng Wen, Aiping Wu, Chunxu Wang, Zhiling Tian
|On-Site Speaker (Planned)
Maraging steel welded joints with high strength and toughness were successfully obtained. The element of Cu has a significant effect on precipitates and reverted austenite, by influencing the element diffusion and phase transformation. The element of Cu in the weld metal brings out a lot of ε-Cu precipitate during the aging period. The amount of ε-Cu precipitate increases gradually with the increase of the aging temperature, which is beneficial to the strength, yet harmful to the toughness. Meanwhile,the addition of Cu changes the diffusion kinetic condition to promote the diffusion of Ni, resulting in the decrease of segregation of elements. The reverted austenite in grain boundaries which has an adverse effect on the toughness has been correspondingly reduced. Besides, Cu makes the thermodynamic condition different, with a lower critical driving force of phase transformation, to cause the increase of reverted austenite in the matrix.
||Planned: Supplemental Proceedings volume