Journal Article

PUBDB-2016-01212

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Martensite stabilization during superelastic cycling of laser welded NiTi plates

Oliveira, J. P. (Corresponding author)>Extern* ; Fernandes, F. M. B. ; Schell, N.>Extern* ; Miranda, R. M.

2016
Elsevier New York, NY [u.a.]

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Please use a persistent id in citations: doi:10.1016/j.matlet.2016.02.107

Abstract: Superelastic behavior of laser welded NiTi is significantly different from the original base material due tomicrostructural changes introduced during welding. These are responsible for a higher accumulated irrecoverablestrain during mechanical cycling. In order to clarify the mechanisms responsible for theevolution of the accumulated irrecoverable strain on superelastic laser welded NiTi, detailed synchrotronX-ray diffraction analysis was performed. Welded samples were analyzed as-welded, after 4 cycles at 10%strain and after 600 cycles at 10% strain. As-welded sample had thermally stabilized martensite in theheat affected and fusion zones due to the welding procedure. It was observed that after 4 cycles, stabilizationof the stress induced martensite occurred in a massive way in the thermal affected regions, dueto the introduction of defects which prevented the reverse transformation upon unloading. After 600cycles no significant changes were observed in the thermal affected regions. However, evidence ofmartensite stabilization in the base material, which was originally fully austenitic, near the heat affectedzone was observed.

Note: (c) Elsevier B.V.

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Contributing Institute(s):

1. DOOR-User (DOOR)
2. Zentrum für Material- und Küstenforschung (HZG)

Research Program(s):

1. 6G3 - PETRA III (POF3-622) (POF3-622)
2. 6213 - Materials and Processes for Energy and Transport Technologies (POF3-621) (POF3-621)
3. FS-Proposal: I-20120563 EC (I-20120563-EC) (I-20120563-EC)
4. CALIPSO - Coordinated Access to Lightsources to Promote Standards and Optimization (312284) (312284)

Experiment(s):

1. PETRA Beamline P07 (PETRA III)

Appears in the scientific report 2016

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Database coverage:
; ; Current Contents - Engineering, Computing and Technology ; Current Contents - Physical, Chemical and Earth Sciences ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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