Mechanical Properties of Laser Heat Treated 6 mm Thick UHSS-Steel

Journal Article · Wed May 04 00:00:00 EDT 2011 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3589699· OSTI ID:21516716

Jaervenpaeae, Antti; Maentyjaervi, Kari; Maeaettae, Antti; Hietala, Mikko ^[1]; Merklein, Marion ^[2]; Karjalainen, Jussi ^[3]

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1. University of Oulu, Oulu Southern Institute, Pajatie 5, FIN-85500 Nivala (Finland)
2. University of Erlangen-Nuremberg, Chair of Manufacturing Technology (Germany)
3. University of Oulu, Department of Mechanical Engineering, P.O. BOX 4200, FIN-90014 (Finland)

In this work abrasion resistant (AR) steel with a sheet thickness of 6 mm was heat treated by a 4 kW Nd:YAG and a 4 kW Yb:Yag-laser, followed by self-quenching. In the delivered condition, test material blank (B27S) is water quenched from 920 deg. C. In this condition, fully martensitic microstructure provides excellent hardness of over 500 HB. The test material is referred to AR500 from now onwards. Laser heat treatment was carried out only on top surface of the AR500 sheet: the achieved maximum temperature in the cross-section varies as a function of the depth. Consequently, the microstructure and mechanical properties differ between the surfaces and the centre of the cross-section (layered microstructure). For better understanding, all layers were tested in tensile tests. For a wide heat treatment track, the laser beam was moved by scanning. Temperatures were measured using thermographic camera and thermocouples. Laser heat treated AR500 samples were tested in hardness tests and by air bending using a press brake machine. Microstructures were studied using a light microscope and FE-SEM/SEM-EBSD. At least three kind of microstructure layers were observed: 1) Dual-Phase ferritic/martensitic (T = A{sub C1}-A{sub C3}), 2) ferritic (T{approx}A{sub C3}) and 3) bainitic/martensitic (T>A{sub C3}).

• OSTI ID: 21516716
• Journal Information: AIP Conference Proceedings, Vol. 1353, Issue 1; Conference: ESAFORM 2011: 14. international ESAFORM conference on material forming, Belfast, Northern Ireland (United Kingdom), 27-29 Apr 2011; Other Information: DOI: 10.1063/1.3589699; (c) 2011 American Institute of Physics; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BACKSCATTERING
CROSS SECTIONS
ELECTRON DIFFRACTION
FERRITIC STEELS
HARDNESS
HEAT TREATMENTS
LASER RADIATION
LAYERS
MARTENSITIC STEELS
MICROSTRUCTURE
NEODYMIUM LASERS
QUENCHING
SCANNING ELECTRON MICROSCOPY
SURFACES
THERMOCOUPLES
ALLOYS
CARBON ADDITIONS
COHERENT SCATTERING
DIFFRACTION
ELECTROMAGNETIC RADIATION
ELECTRON MICROSCOPY
IRON ALLOYS
IRON BASE ALLOYS
LASERS
MEASURING INSTRUMENTS
MECHANICAL PROPERTIES
MICROSCOPY
RADIATIONS
SCATTERING
SOLID STATE LASERS
STEELS
TRANSITION ELEMENT ALLOYS