TY - JOUR
T1 - Microstructural investigation of the effect of hot-isostatic-pressing treatment on a laser powder bed fused type 316L stainless steel
AU - Zhang, Songtao
AU - Bi, Fengqin
AU - Wu, Tao
AU - Wang, Yong
AU - Que, Zaiqing
AU - Chang, Litao
N1 - Funding Information:
The authors would like to acknowledge the financial support from Shanghai Institute of Applied Physics, Chinese Academy of Sciences under grant No. E051011031, National Natural Science Foundation of China (Grant No. 51974091), VTT Substance Node Excellence Canva (GG_PIETU_Node), EU Horizon 2020 project MEACTOS (EURATOMS research and training programme 2014-2018 under grant agreement no. 755151).
Publisher Copyright:
© 2023 Elsevier Inc.
PY - 2023/3
Y1 - 2023/3
N2 - Microstructure variation before and after hot isostatic pressing (HIPing) treatments of a laser powder bed fused (LPBFed) 316L stainless steel has been investigated via complementary material characterizations. The results showed that HIPing closed most of the pores in the LPBFed 316L. In addition, most of the cellular structures that formed during printing were eliminated as a result of recrystallization and grain growth. The extent of recrystallization in the LPBFed 316L increased from 68% to 96% when the HIPing temperature was increased from 1150 °C to 1180 °C (4 h for both). Cellular structures with interrupted dislocation walls were observed within the un-recrystallized grains, whilst nano-sized oxide particles existed within both the un-recrystallized and recrystallized grains. However, chemistry of the nano-sized oxides changed from Mn and Si riched to Mn and Cr riched during the HIPing process. Microstructure evolution, and especially the abnormal recrystallization behavior of the material, was discussed based on the experimental observations.
AB - Microstructure variation before and after hot isostatic pressing (HIPing) treatments of a laser powder bed fused (LPBFed) 316L stainless steel has been investigated via complementary material characterizations. The results showed that HIPing closed most of the pores in the LPBFed 316L. In addition, most of the cellular structures that formed during printing were eliminated as a result of recrystallization and grain growth. The extent of recrystallization in the LPBFed 316L increased from 68% to 96% when the HIPing temperature was increased from 1150 °C to 1180 °C (4 h for both). Cellular structures with interrupted dislocation walls were observed within the un-recrystallized grains, whilst nano-sized oxide particles existed within both the un-recrystallized and recrystallized grains. However, chemistry of the nano-sized oxides changed from Mn and Si riched to Mn and Cr riched during the HIPing process. Microstructure evolution, and especially the abnormal recrystallization behavior of the material, was discussed based on the experimental observations.
KW - 316L stainless steel
KW - Cellular structure
KW - Hot-isostatic press
KW - Laser powder bed fusion
KW - Recrystallization
UR - http://www.scopus.com/inward/record.url?scp=85147607273&partnerID=8YFLogxK
U2 - 10.1016/j.matchar.2023.112716
DO - 10.1016/j.matchar.2023.112716
M3 - Article
AN - SCOPUS:85147607273
SN - 1044-5803
VL - 197
JO - Materials Characterization
JF - Materials Characterization
M1 - 112716
ER -