Microstructural and mechanical performance of Al2O3 nanoparticle reinforced 17-4 PH stainless steel bulk composite parts fabricated by laser engineered net shaping process

Fuda Ning, Yingbin Hu, Zhichao Liu, Hui Wang, Weilong Cong, Yuzhou Li

Research output: Contribution to conferencePaperpeer-review

Abstract

Alloy 17-4 PH (AISI 630) is a precipitation-hardening martensitic stainless steel that has been extensively employed in the industries of aerospace, marine, and chemical. In this study, bulk parts of both 17-4 PH and Al2O3 reinforced 17-4 PH composites were fabricated on a steel substrate by laser engineered net shaping (LENS) process to investigate the effects of Al2O3 reinforcements on the part performance. The 17-4 PH powders were pre-mixed with Al2O3 nanoparticles by ball milling. The microstructures of both parts were observed using scanning electron microscopy and mechanical properties including microhardness and compressive properties were evaluated by means of a Vickers microhardness tester and a universal tester, respectively. The results indicate that Al2O3 reinforced 17-4 PH composite parts fabricated by LENS process exhibited superior microhardness and compressive properties as compared to pure 17-4 PH parts.

Original languageEnglish
Pages617-624
Number of pages8
StatePublished - 2016
Event27th Annual International Solid Freeform Fabrication Symposium - An Additive Manufacturing Conference, SFF 2016 - Austin, United States
Duration: Aug 8 2016Aug 10 2016

Conference

Conference27th Annual International Solid Freeform Fabrication Symposium - An Additive Manufacturing Conference, SFF 2016
Country/TerritoryUnited States
CityAustin
Period08/8/1608/10/16

Keywords

  • AlO nanoparticle reinforced composites
  • Compressive properties
  • Laser engineered net shaping (LENS)
  • Microhardness
  • Microstructures

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