Title: Transient Phase-Driven Cyclic Deformation in Additively Manufactured 15-5 PH Steel

Journal Article · · Materials
DOI: https://doi.org/10.3390/ma15030777 · OSTI ID:2471527
 [1];  [2];  [2]; ORCiD logo [3];  [3];  [4]; ORCiD logo [5]; ORCiD logo [2]
  1. National Yang Ming Chiao Tung University, Hsinchu (Taiwan); Can Tho University (Vietnam)
  2. National Yang Ming Chiao Tung University, Hsinchu (Taiwan)
  3. Chungnam National University, Daejeon (Korea, Republic of)
  4. Indian Institute of Technology, New Delhi (India)
  5. Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

The present work extends the examination of selective laser melting (SLM)-fabricated 15-5 PH steel with the 8%-transient-austenite-phase towards fully-reversed strain-controlled low-cycle fatigue (LCF) test. The cyclic-deformation response and microstructural evolution were investigated via in-situ neutron-diffraction measurements. The transient-austenite-phase rapidly transformed into the martensite phase in the initial cyclic-hardening stage, followed by an almost complete martensitic transformation in the cyclic-softening and steady stage. The compressive stress was much greater than the tensile stress at the same strain amplitude. The enhanced martensitic transformation associated with lower dislocation densities under compression predominantly governed such a striking tension-compression asymmetry in the SLM-built 15-5 PH.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS)
Sponsoring Organization:
Ministry of Science and Technology (MOST); Ministry of Science and Technology, Taiwan; National Research Foundation (NRF); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
2471527
Journal Information:
Materials, Journal Name: Materials Journal Issue: 3 Vol. 15; ISSN 1996-1944
Publisher:
MDPICopyright Statement
Country of Publication:
United States
Language:
English

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