Abstract
Laser surface hardening is a promising surface technology to enhance the properties of surfaces. This technology was used on the 42CrMo press brake die. Its hardening behavior was investigated by using scanning electron microscopy and electron backscattering diffraction. The results indicated that the martensite in the hardening zone was significantly finer than that in the substrate. There were many low-angle grain boundaries in the martensite of the hardening zone, and the kernel average misorientation and grain orientation spread in the hardening zone grains were obviously greater, which further improved the hardness of the hardening zone, especially near the substrate. The microstructure and the properties of the blade maintained excellent uniformity with treatment by single-pass laser surface hardening with a spot size of 2 mm, scanning speed of 1800 mm/min, and power of 2200 W. The hardness of the hardening zone was 1.6 times higher than that of the base material, and the thickness of the hardening zone reached 1.05 mm.
Highlights
Lee and Telasang et al [18,19] studied the laser surface hardening behavior of AISI H13 tool steel and the results showed that the hardness and the wear resistance were enhanced
A single-pass laser surface hardening of the press brake die blade with a spot size of 2 mm, scanning speed of 1800 mm/min, and power of 2200 W can solve the problems of insufficient process hardness and uneven distribution of properties and microstructure, and according to different requirements of laser hardening depth, the spot size and the process parameters can be optimized
The blade of the 42CrMo press brake die was hardened by the diode laser
Summary
With the increasing requirements of properties under some working conditions, the blade of the press brake die requires a higher wear resistance with minimal deformation. One of the promising surface technologies is laser surface hardening, which has advantages of high accuracy, high thermal concentration, low heat input, and high processing speed [6,7] It can significantly enhance the surface hardness and wear resistance [8,9,10,11,12]. Lee and Telasang et al [18,19] studied the laser surface hardening behavior of AISI H13 tool steel and the results showed that the hardness and the wear resistance were enhanced. This study has significance for the applications of 42CrMo press brake die and the laser surface hardening process formulation and evaluation of many steels
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