Abstract
Temperature history and hardening depth are experimentally characterized in the rotational laser hardening process for an AISI 1045 medium carbon steel specimen. A three-dimensional finite element model is proposed to predict the temperature field distribution and hardening zone area. The laser temperature field is set up for an average distribution and scanned along a circular path. Linear motion also takes place alongside rotation. The prediction of hardening area can be increased by increasing the rotational radius, which in turn raises the processing efficiency. A good agreement is found between the experimental characterized hardness value and metallographic composition. The uniformity of the hardening area decreases with increasing laser scanning speed. The increased laser power input could help to expand the hardening depth.
Highlights
Laser surface heat treatment technology can perform surface modifications such as hardening and alloying
Martínez used laser transformation hardening with scanning optics (LTHS) in the surface treatment industry and proposed a closed-loop control to maintain a nominal temperature value [1,2,3]
The hardening zone of quenching induced by rotational laser scanning will be experimentally measured and predicted by finite element modelling
Summary
Laser surface heat treatment technology can perform surface modifications such as hardening and alloying. Proposed the use of a rotating machined part to machine the surface of a laser light ring-shaped material, which could obtain a uniform hardened layer on the surface of AISI 1040 [6]. Skvarenina and Shin used experimental and numerical analysis to investigate the surface hardness and hardened layer depth of AISI 1536 steel under different laser quenching conditions and to estimate the absorbance of the material for the laser [14]. The current study will provide a numerical and experimental analysis of the thermal response of the AISI1045 workpiece material in the laser quenching process. The hardening zone of quenching induced by rotational laser scanning will be experimentally measured and predicted by finite element modelling. A parametric study will be conducted to investigate the effect of laser power and feed rate on the temperature field
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