Laser Hardening Prediction Tool Based On a Solid State Transformations Numerical Model

Journal Article · Mon Jan 17 00:00:00 EST 2011 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3552418· OSTI ID:21513161

Martinez, S; Ukar, E; Lamikiz, A ^[1]; Liebana, F ^[2]

---

1. Department of Mechanical Engineering, University of the Basque Country, ETSII, c/Alameda de Urquijo s/n, 48013 Bilbao (Spain)
2. Robotiker Technology Centre, Parque Tecnologico, Edif. 202, Zamudio 48170 (Spain)

This paper presents a tool to predict hardening layer in selective laser hardening processes where laser beam heats the part locally while the bulk acts as a heat sink.The tool to predict accurately the temperature field in the workpiece is a numerical model that combines a three dimensional transient numerical solution for heating where is possible to introduce different laser sources. The thermal field was modeled using a kinetic model based on Johnson-Mehl-Avrami equation. Considering this equation, an experimental adjustment of transformation parameters was carried out to get the heating transformation diagrams (CHT). With the temperature field and CHT diagrams the model predicts the percentage of base material converted into austenite. These two parameters are used as first step to estimate the depth of hardened layer in the part.The model has been adjusted and validated with experimental data for DIN 1.2379, cold work tool steel typically used in mold and die making industry. This steel presents solid state diffusive transformations at relative low temperature. These transformations must be considered in order to get good accuracy of temperature field prediction during heating phase. For model validation, surface temperature measured by pyrometry, thermal field as well as the hardened layer obtained from metallographic study, were compared with the model data showing a good adjustment.

• OSTI ID: 21513161
• Journal Information: AIP Conference Proceedings, Vol. 1315, Issue 1; Conference: AMPT2010: International conference on advances in materials and processing technologies, Paris (France), 24-27 Oct 2010; Other Information: DOI: 10.1063/1.3552418; (c) 2010 American Institute of Physics; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ACCURACY
AUSTENITE
BEAMS
CRYSTAL-PHASE TRANSFORMATIONS
EQUATIONS
FORECASTING
HEAT
HEAT SINKS
HEATING
LAYERS
METALLOGRAPHY
NUMERICAL SOLUTION
SEMICONDUCTOR LASERS
SOLIDS
STEELS
SURFACE HARDENING
SURFACES
THERMAL DIFFUSION
THREE-DIMENSIONAL CALCULATIONS
TRANSFORMATIONS
TRANSIENTS
ALLOYS
CARBON ADDITIONS
DIFFUSION
ENERGY
HARDENING
IRON ALLOYS
IRON BASE ALLOYS
LASERS
MATHEMATICAL SOLUTIONS
PHASE TRANSFORMATIONS
SEMICONDUCTOR DEVICES
SINKS
SOLID STATE LASERS
SURFACE TREATMENTS
TRANSITION ELEMENT ALLOYS