Nanostructured Fe-20Cr-10Ni-2Si Layer Produced by Laser Cladding and Friction Stir Processing

Journal Article · Mon Apr 15 04:00:00 EDT 2019 · Metallurgical and Materials Transactions. B, Process Metallurgy and Materials Processing Science

DOI:https://doi.org/10.1007/S11663-019-01539-7· OSTI ID:22933629

Peng, H. P. ^[1]; Niu, P. D.; Yuan, T. C. ^[2]

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1. Changzhou University, Jiangsu Key Laboratory of Oil and Gas Storage and Transportation Technology (China)
2. Central South University, State Key Laboratory of Powder Metallurgy, Science and Technology on High Strength Structural Materials Laboratory (China)

Laser cladding of Fe-20Cr-10Ni-2Si alloy usually faces challenge of metallurgical defects like micropores and interdendritic fragile precipitates. In this paper, the laser cladding combined with friction stir processing (FSP) was applied to deal with this problem and prepare the nanostructured Fe-20Cr-10Ni-2Si alloy layer. The coarse dendritic grains (5 ~ 10 μm) of laser processed Fe-20Cr-10Ni-2Si alloy were broken into nanocrystallines which contain uniformly distributed nanoparticles (5 ~ 400 nm) in the deformation zone by FSP. The gradient microstructure with an average grain size of several nanometers on the top surface to several micrometers in the center part was obtained by FSP. Meanwhile, the grain size in the plastic zone decreases as the rotary speed rises. Grain refinement by FSP results in the increase of microhardness from 323 HV up to 583 HV, decreasing the friction coefficient from 0.42 to 0.35 and thus the wear resistance is improved.

• OSTI ID: 22933629
• Journal Information: Metallurgical and Materials Transactions. B, Process Metallurgy and Materials Processing Science, Journal Name: Metallurgical and Materials Transactions. B, Process Metallurgy and Materials Processing Science Journal Issue: 2 Vol. 50; ISSN 1073-5615; ISSN MTBSEO
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
77 NANOSCIENCE AND NANOTECHNOLOGY
CLADDING
DEFECTS
DEFORMATION
FRICTION FACTOR
GRAIN REFINEMENT
GRAIN SIZE
IRON ALLOYS
LASERS
MICROHARDNESS
NANOPARTICLES
NANOSTRUCTURES
PRECIPITATION
WEAR RESISTANCE