Microstructural investigation of the effect of hot-isostatic-pressing treatment on a laser powder bed fused type 316L stainless steel

Songtao Zhang, Fengqin Bi, Tao Wu, Yong Wang, Zaiqing Que (Corresponding Author), Litao Chang (Corresponding Author)

Research output: Contribution to journalArticleScientificpeer-review

5 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article number112716
Number of pages8
JournalMaterials Characterization
Volume197
DOIs
Publication statusPublished - Mar 2023
MoE publication typeA1 Journal article-refereed

Keywords

  • 316L stainless steel
  • Cellular structure
  • Hot-isostatic press
  • Laser powder bed fusion
  • Recrystallization

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