On the thermal coarsening and transformation of nanoscale oxide inclusions in 316L stainless steel manufactured by laser powder bed fusion and its influence on impact toughness
Journal Article
·
· Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing
- Auburn Univ., AL (United States); OSTI
- Univ. of Michigan, Ann Arbor, MI (United States)
- Auburn Univ., AL (United States)
- Univ. of Alabama, Tuscaloosa, AL (United States)
The thermal evolution of nanoscale oxide inclusions in 316L stainless steel (SS) manufactured by laser powder bed fusion additive manufacturing (AM) was explored. The size, chemical composition, morphology, and distribution of the oxides were characterized as the function of heat treatment conditions. The study revealed the mechanistic driving force of the rapid oxide coarsening during recrystallization. Ostwald ripening governs oxide coarsening. The active grain boundary-oxide interaction at the early stage of recrystallization accelerated oxide coarsening via enhanced solute diffusion along grain boundaries. Pipe diffusion along dislocation cellular boundaries has a negligible contribution to oxide coarsening. At high temperatures (T> 1065 °C), although lattice diffusion primarily controlled the oxide growth, the contribution from the grain-boundary diffusion was necessary. The transformation from MnSiO3 to CrMn2O4 took place in the un-recrystallized grains but was not observed when recrystallization started. The interaction of grain boundary and oxides during recrystallization resulted in a high fraction of oxides accumulated at grain boundaries. While oxide coarsening does not significantly alter the toughness value, grain-boundary oxides promote microvoid formation and intergranular fracture under Charpy impact in the recrystallized AM 316L SS.
- Research Organization:
- General Electric Co., Boston, MA (United States)
- Sponsoring Organization:
- National Inst. of Standards and Technology (NIST); USDOE; USDOE Office of Nuclear Energy (NE)
- Grant/Contract Number:
- NE0008428
- OSTI ID:
- 1977464
- Alternate ID(s):
- OSTI ID: 1841630
- Journal Information:
- Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing, Journal Name: Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing Journal Issue: C Vol. 835; ISSN 0921-5093
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Similar Records
Sensitization of 316L Stainless Steel made by Laser Powder Bed Fusion Additive Manufacturing
Carbon nanotube (CNT) reinforced 316L stainless steel composites made by laser powder bed fusion: Microstructure and wear response
Study of the interaction of pores with grain boundaries
Journal Article
·
Mon Jan 09 19:00:00 EST 2023
· Corrosion
·
OSTI ID:2205325
Carbon nanotube (CNT) reinforced 316L stainless steel composites made by laser powder bed fusion: Microstructure and wear response
Journal Article
·
Mon Feb 07 19:00:00 EST 2022
· Wear
·
OSTI ID:1977708
Study of the interaction of pores with grain boundaries
Conference
·
· TMS (The Metallurgical Society) Paper Selection; (USA)
·
OSTI ID:5443230