Integrated effects of non-equilibrium microstructures on stress corrosion cracking susceptibility of post-treated laser powder-bed-fusion 316 L stainless steels

Laser powder-bed-fusion (L-PBF) technique offers unparalleled advantages in fabricating complex geometries for the nuclear industry, while dominant microstructure features responsible for stress corrosion cracking (SCC) remain poorly understood for L-PBFed stainless steels (SSs). This work aims to untangle the integrated effects of non-equilibrium microstructure on SCC behavior of multiple post-treated L-PBFed 316 L SSs in high-temperature oxygenated water. Results unveil that the residual strain and anisotropy grains jointly deteriorate the planar SCC initiation response, while high-density low angle grain boundaries alleviate the depth attack of short-term SCC propagation. Furthermore, the cellular…

• NN
  National Natural Science Foundation of China

  Award: 12275176
• CN
  China National Nuclear Corporation